TY  - JOUR
AU  - Stojaković, Đorđe
AU  - Jovanović, Mina
AU  - Rajić, Nevenka
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3501
AB  - The present study was aimed at examining the ability of the natural zeolitic tuff from the Zlatokop deposit in Serbia to remove Pb(II) ions from aqueous solutions under various conditions. It has been found that the adsorption proceeds via an ion-exchange reaction in which the Na+ ions from the clinoptilolite phase of the tuff are replaced to a high degree by aqueous Pb(II) ions. The removal capacity of the clinoptilolite at 298 K varies from 78 mg Pb g(-1) (for C-0 = 100 mg Pb dm-3) to 92.5 mg Pb g(-1) (for C-0 = 400 mg Pb dm(-3)), the capacity markedly increasing with temperature. The adsorption isotherm is in accord with the Langmuir model. The ion-exchange kinetics can be best described by the pseudo-second-order model. Intra-particle diffusion of Pb2+ is present in the process, but it is not the rate-limiting step and that can be explained by a modification of the Pb(II) hydration sphere during the ion-exchange. From the adsorption of Pb(II) on the studied zeolitic tuff, it is revealed that the ion-exchange process is spontaneous and endothermic, and that the standard free energy decreases with temperature.
PB  - Gheorghe Asachi Technical University of Iasi, Romania
T2  - Environmental Engineering and Management Journal
T1  - Lead(ii) removal from aqueous solutions by Serbian zeolitic tuff
EP  - 140
IS  - 1
SP  - 131
VL  - 16
DO  - 10.30638/eemj.2017.015
ER  - 

@article{
author = "Stojaković, Đorđe and Jovanović, Mina and Rajić, Nevenka",
year = "2017",
abstract = "The present study was aimed at examining the ability of the natural zeolitic tuff from the Zlatokop deposit in Serbia to remove Pb(II) ions from aqueous solutions under various conditions. It has been found that the adsorption proceeds via an ion-exchange reaction in which the Na+ ions from the clinoptilolite phase of the tuff are replaced to a high degree by aqueous Pb(II) ions. The removal capacity of the clinoptilolite at 298 K varies from 78 mg Pb g(-1) (for C-0 = 100 mg Pb dm-3) to 92.5 mg Pb g(-1) (for C-0 = 400 mg Pb dm(-3)), the capacity markedly increasing with temperature. The adsorption isotherm is in accord with the Langmuir model. The ion-exchange kinetics can be best described by the pseudo-second-order model. Intra-particle diffusion of Pb2+ is present in the process, but it is not the rate-limiting step and that can be explained by a modification of the Pb(II) hydration sphere during the ion-exchange. From the adsorption of Pb(II) on the studied zeolitic tuff, it is revealed that the ion-exchange process is spontaneous and endothermic, and that the standard free energy decreases with temperature.",
publisher = "Gheorghe Asachi Technical University of Iasi, Romania",
journal = "Environmental Engineering and Management Journal",
title = "Lead(ii) removal from aqueous solutions by Serbian zeolitic tuff",
pages = "140-131",
number = "1",
volume = "16",
doi = "10.30638/eemj.2017.015"
}

Stojaković, Đ., Jovanović, M.,& Rajić, N.. (2017). Lead(ii) removal from aqueous solutions by Serbian zeolitic tuff. in Environmental Engineering and Management Journal
Gheorghe Asachi Technical University of Iasi, Romania., 16(1), 131-140.
https://doi.org/10.30638/eemj.2017.015

Stojaković Đ, Jovanović M, Rajić N. Lead(ii) removal from aqueous solutions by Serbian zeolitic tuff. in Environmental Engineering and Management Journal. 2017;16(1):131-140.
doi:10.30638/eemj.2017.015 .

Stojaković, Đorđe, Jovanović, Mina, Rajić, Nevenka, "Lead(ii) removal from aqueous solutions by Serbian zeolitic tuff" in Environmental Engineering and Management Journal, 16, no. 1 (2017):131-140,
https://doi.org/10.30638/eemj.2017.015 . .

TY  - JOUR
AU  - Stojaković, Đorđe
AU  - Dikić, Jelena
AU  - Stupar, Stevan
AU  - Veličković, Zlate
AU  - Rajić, Nevenka
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3278
AB  - Sorption of the Zn2+ and Ni2+ ions by the Na+-enriched natural clinoptilolite (Na-CLI) from aqueous solutions containing both Zn2+ and Ni2+ ions at a range of concentrations has been studied at 298, 308, and 318K. It was found that the sorption of a particular ion by Na-CLI increases with the increase in the initial concentration of the solution of that ion. At a given initial concentration, the sorption degree increases with temperature. Also, the sorption of a particular ion is greater when the initial solution contains a second ion than it is when the particular ion is present alone. The sorption kinetics is in accord with the pseudo-second-order reaction rate model. The values of the k(2) rate constant do not show a regular change with the initial Zn2+/Ni2+ concentrations probably because the presence of the second ion has a significant effect on the reaction rate. Thermodynamic study has shown that the sorption is exothermic, occurring spontaneously in the 298-318K range and with a positive entropy change.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Desalination and Water Treatment
T1  - Binary adsorption of nickel and zinc from aqueous solutions onto the Serbian natural clinoptilolite
EP  - 18754
IS  - 40
SP  - 18748
VL  - 57
DO  - 10.1080/19443994.2015.1094426
ER  - 

@article{
author = "Stojaković, Đorđe and Dikić, Jelena and Stupar, Stevan and Veličković, Zlate and Rajić, Nevenka",
year = "2016",
abstract = "Sorption of the Zn2+ and Ni2+ ions by the Na+-enriched natural clinoptilolite (Na-CLI) from aqueous solutions containing both Zn2+ and Ni2+ ions at a range of concentrations has been studied at 298, 308, and 318K. It was found that the sorption of a particular ion by Na-CLI increases with the increase in the initial concentration of the solution of that ion. At a given initial concentration, the sorption degree increases with temperature. Also, the sorption of a particular ion is greater when the initial solution contains a second ion than it is when the particular ion is present alone. The sorption kinetics is in accord with the pseudo-second-order reaction rate model. The values of the k(2) rate constant do not show a regular change with the initial Zn2+/Ni2+ concentrations probably because the presence of the second ion has a significant effect on the reaction rate. Thermodynamic study has shown that the sorption is exothermic, occurring spontaneously in the 298-318K range and with a positive entropy change.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Desalination and Water Treatment",
title = "Binary adsorption of nickel and zinc from aqueous solutions onto the Serbian natural clinoptilolite",
pages = "18754-18748",
number = "40",
volume = "57",
doi = "10.1080/19443994.2015.1094426"
}

Stojaković, Đ., Dikić, J., Stupar, S., Veličković, Z.,& Rajić, N.. (2016). Binary adsorption of nickel and zinc from aqueous solutions onto the Serbian natural clinoptilolite. in Desalination and Water Treatment
Taylor & Francis Inc, Philadelphia., 57(40), 18748-18754.
https://doi.org/10.1080/19443994.2015.1094426

Stojaković Đ, Dikić J, Stupar S, Veličković Z, Rajić N. Binary adsorption of nickel and zinc from aqueous solutions onto the Serbian natural clinoptilolite. in Desalination and Water Treatment. 2016;57(40):18748-18754.
doi:10.1080/19443994.2015.1094426 .

Stojaković, Đorđe, Dikić, Jelena, Stupar, Stevan, Veličković, Zlate, Rajić, Nevenka, "Binary adsorption of nickel and zinc from aqueous solutions onto the Serbian natural clinoptilolite" in Desalination and Water Treatment, 57, no. 40 (2016):18748-18754,
https://doi.org/10.1080/19443994.2015.1094426 . .

TY  - JOUR
AU  - Stojaković, Đorđe
AU  - Bugarski, Branko
AU  - Rajić, Nevenka
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2224
AB  - Thermal release of vanillin encapsulated in Carnauba wax microcapsules was studied by isothermal thermogravimetric analysis at 443, 453, 473, and 483 K. The thermal analysis data were analyzed kinetically and it was found that they can be satisfactorily described mathematically by the Avrami-Erofe'ev kinetic model A3. However, application of the isoconversional Friedman's method showed that the activation energy of the vanillin release changes significantly with the degree of conversion, implying that the release is not a single-step reaction but a complex kinetic process. Nonetheless, the activation energies throughout the process remain relatively low (below 40 kJ mol(-1)), meaning that the Carnauba wax as a carrier can easily release vanillin in food processing.
PB  - Elsevier Sci Ltd, Oxford
T2  - Journal of Food Engineering
T1  - A kinetic study of the release of vanillin encapsulated in Carnauba wax microcapsules
EP  - 642
IS  - 3
SP  - 640
VL  - 109
DO  - 10.1016/j.jfoodeng.2011.11.022
ER  - 

@article{
author = "Stojaković, Đorđe and Bugarski, Branko and Rajić, Nevenka",
year = "2012",
abstract = "Thermal release of vanillin encapsulated in Carnauba wax microcapsules was studied by isothermal thermogravimetric analysis at 443, 453, 473, and 483 K. The thermal analysis data were analyzed kinetically and it was found that they can be satisfactorily described mathematically by the Avrami-Erofe'ev kinetic model A3. However, application of the isoconversional Friedman's method showed that the activation energy of the vanillin release changes significantly with the degree of conversion, implying that the release is not a single-step reaction but a complex kinetic process. Nonetheless, the activation energies throughout the process remain relatively low (below 40 kJ mol(-1)), meaning that the Carnauba wax as a carrier can easily release vanillin in food processing.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Journal of Food Engineering",
title = "A kinetic study of the release of vanillin encapsulated in Carnauba wax microcapsules",
pages = "642-640",
number = "3",
volume = "109",
doi = "10.1016/j.jfoodeng.2011.11.022"
}

Stojaković, Đ., Bugarski, B.,& Rajić, N.. (2012). A kinetic study of the release of vanillin encapsulated in Carnauba wax microcapsules. in Journal of Food Engineering
Elsevier Sci Ltd, Oxford., 109(3), 640-642.
https://doi.org/10.1016/j.jfoodeng.2011.11.022

Stojaković Đ, Bugarski B, Rajić N. A kinetic study of the release of vanillin encapsulated in Carnauba wax microcapsules. in Journal of Food Engineering. 2012;109(3):640-642.
doi:10.1016/j.jfoodeng.2011.11.022 .

Stojaković, Đorđe, Bugarski, Branko, Rajić, Nevenka, "A kinetic study of the release of vanillin encapsulated in Carnauba wax microcapsules" in Journal of Food Engineering, 109, no. 3 (2012):640-642,
https://doi.org/10.1016/j.jfoodeng.2011.11.022 . .

TY  - CONF
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Hrenović, Jasna
AU  - Rečnik, Aleksander
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5211
PB  - Editorial Universitat Politècnica de València
C3  - 5th International FEZA Conference - Book of Abstracts
T1  - Could natural Serbian clinoptilolite efficiently remove metal ions from aqueous solutions and also be converted into a novel material after being metal-loaded?
SP  - 121
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5211
ER  - 

@conference{
author = "Rajić, Nevenka and Stojaković, Đorđe and Hrenović, Jasna and Rečnik, Aleksander",
year = "2011",
publisher = "Editorial Universitat Politècnica de València",
journal = "5th International FEZA Conference - Book of Abstracts",
title = "Could natural Serbian clinoptilolite efficiently remove metal ions from aqueous solutions and also be converted into a novel material after being metal-loaded?",
pages = "121",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5211"
}

Rajić, N., Stojaković, Đ., Hrenović, J.,& Rečnik, A.. (2011). Could natural Serbian clinoptilolite efficiently remove metal ions from aqueous solutions and also be converted into a novel material after being metal-loaded?. in 5th International FEZA Conference - Book of Abstracts
Editorial Universitat Politècnica de València., 121.
https://hdl.handle.net/21.15107/rcub_technorep_5211

Rajić N, Stojaković Đ, Hrenović J, Rečnik A. Could natural Serbian clinoptilolite efficiently remove metal ions from aqueous solutions and also be converted into a novel material after being metal-loaded?. in 5th International FEZA Conference - Book of Abstracts. 2011;:121.
https://hdl.handle.net/21.15107/rcub_technorep_5211 .

Rajić, Nevenka, Stojaković, Đorđe, Hrenović, Jasna, Rečnik, Aleksander, "Could natural Serbian clinoptilolite efficiently remove metal ions from aqueous solutions and also be converted into a novel material after being metal-loaded?" in 5th International FEZA Conference - Book of Abstracts (2011):121,
https://hdl.handle.net/21.15107/rcub_technorep_5211 .

TY  - JOUR
AU  - Stojaković, Đorđe
AU  - Dikić, Jelena
AU  - Daneu, Nina
AU  - Rajić, Nevenka
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1919
AB  - Toxic metal contamination of waste waters can be mitigated by metal adsorption to clay and zeolitic minerals, but in developing countries such environmental remediation can be cost prohibitive if these minerals are not readily available. Because of its abundance, low cost, and excellent selectivity for several toxic metal ions, clinoptilolite from the Zlatokop deposit in Serbia was investigated for its ability to remove copper ions from aqueous solutions and serve as an effective local resource for this purpose. The sorption capacity of the clinoptilolite at 298 K varied from 8.3 mg Cu g(-1) (for C-0 = 100 mg Cu dm(-3)) to 16.8 mg Cu g(-1) (for C-0 = 400 mg Cu dm-3). The sorption data were best described by the Freundlich isotherm and the sorption kinetics followed the pseudo-second-order model. Intra-particle diffusion of Cu2+ was present but it is not the rate-limiting step. The sorption of Cu2+ on the clinoptilolite occurred spontaneously, the free energy change decreasing with temperature. The sorption was endothermic and was accompanied by an increase in entropy. Dehydration of the Cu-loaded clinoptilolite at 540 degrees C led to the formation of nanocrystallinc Cu(I) oxide particles with an average size of similar to 2 nm, suggesting possible novel applications for the Cu-loaded clinoptilolite.
PB  - Springer, New York
T2  - Clays and Clay Minerals
T1  - A study of the removal of copper ions from aqueous solution using clinoptilolite from Serbia
EP  - 285
IS  - 3
SP  - 277
VL  - 59
DO  - 10.1346/CCMN.2011.0590305
ER  - 

@article{
author = "Stojaković, Đorđe and Dikić, Jelena and Daneu, Nina and Rajić, Nevenka",
year = "2011",
abstract = "Toxic metal contamination of waste waters can be mitigated by metal adsorption to clay and zeolitic minerals, but in developing countries such environmental remediation can be cost prohibitive if these minerals are not readily available. Because of its abundance, low cost, and excellent selectivity for several toxic metal ions, clinoptilolite from the Zlatokop deposit in Serbia was investigated for its ability to remove copper ions from aqueous solutions and serve as an effective local resource for this purpose. The sorption capacity of the clinoptilolite at 298 K varied from 8.3 mg Cu g(-1) (for C-0 = 100 mg Cu dm(-3)) to 16.8 mg Cu g(-1) (for C-0 = 400 mg Cu dm-3). The sorption data were best described by the Freundlich isotherm and the sorption kinetics followed the pseudo-second-order model. Intra-particle diffusion of Cu2+ was present but it is not the rate-limiting step. The sorption of Cu2+ on the clinoptilolite occurred spontaneously, the free energy change decreasing with temperature. The sorption was endothermic and was accompanied by an increase in entropy. Dehydration of the Cu-loaded clinoptilolite at 540 degrees C led to the formation of nanocrystallinc Cu(I) oxide particles with an average size of similar to 2 nm, suggesting possible novel applications for the Cu-loaded clinoptilolite.",
publisher = "Springer, New York",
journal = "Clays and Clay Minerals",
title = "A study of the removal of copper ions from aqueous solution using clinoptilolite from Serbia",
pages = "285-277",
number = "3",
volume = "59",
doi = "10.1346/CCMN.2011.0590305"
}

Stojaković, Đ., Dikić, J., Daneu, N.,& Rajić, N.. (2011). A study of the removal of copper ions from aqueous solution using clinoptilolite from Serbia. in Clays and Clay Minerals
Springer, New York., 59(3), 277-285.
https://doi.org/10.1346/CCMN.2011.0590305

Stojaković Đ, Dikić J, Daneu N, Rajić N. A study of the removal of copper ions from aqueous solution using clinoptilolite from Serbia. in Clays and Clay Minerals. 2011;59(3):277-285.
doi:10.1346/CCMN.2011.0590305 .

Stojaković, Đorđe, Dikić, Jelena, Daneu, Nina, Rajić, Nevenka, "A study of the removal of copper ions from aqueous solution using clinoptilolite from Serbia" in Clays and Clay Minerals, 59, no. 3 (2011):277-285,
https://doi.org/10.1346/CCMN.2011.0590305 . .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Daneu, Nina
AU  - Recnik, Aleksander
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1946
AB  - Nanoparticles of NiO, ZnO and Cu(2)O crystallize when the Ni-, Zn- and Cu-exchanged natural clinoptilolite, respectively, are dehydrated by heating in air at 550 degrees C. The dehydration of Mn-exchanged clinoptilolite does not lead to the crystallization of manganese oxide but affects the crystallinity of the host clinoptilolite lattice, which becomes amorphous. The NiO, ZnO and Cu(2)O nanoparticles are found to be randomly dispersed in the clinoptilolite matrix. The particle size varies from 2 to 5 nm and exceeds the aperture of the clinoptilolite channel (approximately 0.4 nm), suggesting that the crystallization of the oxide phases takes place on the surfaces of clinoptilolite microcrystals.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Journal of Physics and Chemistry of Solids
T1  - The formation of oxide nanoparticles on the surface of natural clinoptilolite
EP  - 803
IS  - 6
SP  - 800
VL  - 72
DO  - 10.1016/j.jpcs.2011.03.018
ER  - 

@article{
author = "Rajić, Nevenka and Stojaković, Đorđe and Daneu, Nina and Recnik, Aleksander",
year = "2011",
abstract = "Nanoparticles of NiO, ZnO and Cu(2)O crystallize when the Ni-, Zn- and Cu-exchanged natural clinoptilolite, respectively, are dehydrated by heating in air at 550 degrees C. The dehydration of Mn-exchanged clinoptilolite does not lead to the crystallization of manganese oxide but affects the crystallinity of the host clinoptilolite lattice, which becomes amorphous. The NiO, ZnO and Cu(2)O nanoparticles are found to be randomly dispersed in the clinoptilolite matrix. The particle size varies from 2 to 5 nm and exceeds the aperture of the clinoptilolite channel (approximately 0.4 nm), suggesting that the crystallization of the oxide phases takes place on the surfaces of clinoptilolite microcrystals.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Journal of Physics and Chemistry of Solids",
title = "The formation of oxide nanoparticles on the surface of natural clinoptilolite",
pages = "803-800",
number = "6",
volume = "72",
doi = "10.1016/j.jpcs.2011.03.018"
}

Rajić, N., Stojaković, Đ., Daneu, N.,& Recnik, A.. (2011). The formation of oxide nanoparticles on the surface of natural clinoptilolite. in Journal of Physics and Chemistry of Solids
Pergamon-Elsevier Science Ltd, Oxford., 72(6), 800-803.
https://doi.org/10.1016/j.jpcs.2011.03.018

Rajić N, Stojaković Đ, Daneu N, Recnik A. The formation of oxide nanoparticles on the surface of natural clinoptilolite. in Journal of Physics and Chemistry of Solids. 2011;72(6):800-803.
doi:10.1016/j.jpcs.2011.03.018 .

Rajić, Nevenka, Stojaković, Đorđe, Daneu, Nina, Recnik, Aleksander, "The formation of oxide nanoparticles on the surface of natural clinoptilolite" in Journal of Physics and Chemistry of Solids, 72, no. 6 (2011):800-803,
https://doi.org/10.1016/j.jpcs.2011.03.018 . .

TY  - JOUR
AU  - Stojaković, Đorđe
AU  - Hrenović, Jasna
AU  - Mazaj, Matjaz
AU  - Rajić, Nevenka
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1950
AB  - The Serbian natural zeolite is moderately effective in removing the zinc(II) ions from aqueous solutions. At 298 K the sorption capacity varies from 13 to 26% for the initial Zn(II) solution concentration of 100 and 600 mgZn dm(-3), respectively. The sorption isotherm at 298-338 K is best represented by the Langmuir model and the sorption kinetics by the pseudo-second-order model. The sorption involves a combination of film diffusion, intra-particle diffusion, and a chemical cation-exchange between the Na+ ions of clinoptilolite and Zn2+ ions. The sorption was found to be endothermic and spontaneous in the 298-338 K range. The exhausted sorbent can remove phosphate ions and it exhibits an excellent antibacterial activity towards Acinetobacter junii. By dehydration at about 500 degrees C it transforms to a ZnO-containing product featuring nano-sized wurtzite ZnO particles widespread over the clinoptilolite surface.
PB  - Elsevier, Amsterdam
T2  - Journal of Hazardous Materials
T1  - On the zinc sorption by the Serbian natural clinoptilolite and the disinfecting ability and phosphate affinity of the exhausted sorbent
EP  - 415
IS  - 1
SP  - 408
VL  - 185
DO  - 10.1016/j.jhazmat.2010.09.048
ER  - 

@article{
author = "Stojaković, Đorđe and Hrenović, Jasna and Mazaj, Matjaz and Rajić, Nevenka",
year = "2011",
abstract = "The Serbian natural zeolite is moderately effective in removing the zinc(II) ions from aqueous solutions. At 298 K the sorption capacity varies from 13 to 26% for the initial Zn(II) solution concentration of 100 and 600 mgZn dm(-3), respectively. The sorption isotherm at 298-338 K is best represented by the Langmuir model and the sorption kinetics by the pseudo-second-order model. The sorption involves a combination of film diffusion, intra-particle diffusion, and a chemical cation-exchange between the Na+ ions of clinoptilolite and Zn2+ ions. The sorption was found to be endothermic and spontaneous in the 298-338 K range. The exhausted sorbent can remove phosphate ions and it exhibits an excellent antibacterial activity towards Acinetobacter junii. By dehydration at about 500 degrees C it transforms to a ZnO-containing product featuring nano-sized wurtzite ZnO particles widespread over the clinoptilolite surface.",
publisher = "Elsevier, Amsterdam",
journal = "Journal of Hazardous Materials",
title = "On the zinc sorption by the Serbian natural clinoptilolite and the disinfecting ability and phosphate affinity of the exhausted sorbent",
pages = "415-408",
number = "1",
volume = "185",
doi = "10.1016/j.jhazmat.2010.09.048"
}

Stojaković, Đ., Hrenović, J., Mazaj, M.,& Rajić, N.. (2011). On the zinc sorption by the Serbian natural clinoptilolite and the disinfecting ability and phosphate affinity of the exhausted sorbent. in Journal of Hazardous Materials
Elsevier, Amsterdam., 185(1), 408-415.
https://doi.org/10.1016/j.jhazmat.2010.09.048

Stojaković Đ, Hrenović J, Mazaj M, Rajić N. On the zinc sorption by the Serbian natural clinoptilolite and the disinfecting ability and phosphate affinity of the exhausted sorbent. in Journal of Hazardous Materials. 2011;185(1):408-415.
doi:10.1016/j.jhazmat.2010.09.048 .

Stojaković, Đorđe, Hrenović, Jasna, Mazaj, Matjaz, Rajić, Nevenka, "On the zinc sorption by the Serbian natural clinoptilolite and the disinfecting ability and phosphate affinity of the exhausted sorbent" in Journal of Hazardous Materials, 185, no. 1 (2011):408-415,
https://doi.org/10.1016/j.jhazmat.2010.09.048 . .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Jevtić, Sanja
AU  - Zabukovec-Logar, Nataša
AU  - Mali, Gregor
AU  - Kaučič, Venčeslav
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1638
AB  - An open-framework aluminophosphate analog of the fluorogallophosphate structure-type ULM-3 was obtained by hydrothermal crystallization of an aqueous aluminum phosphate suspension in the presence of 3-methylpropylamine (MAPA) and hydrofluoric acid. The open-framework fluorinated aluminophosphate structure was confirmed by Rietveld analysis and the (27)Al, (31)P, and (19)F MAS NMR spectroscopy. The MAPA, located in the ten-membered ring channels, is doubly protonated to balance the negative charge of the Al(3)P(3)O(12)F(2) (2-) framework. Thermogravimetric analysis data have been used to study kinetics of the thermal decomposition of MAPA. The decomposition was found to be a complex process, its activation energy varied from 177 to 259 kJ mol(-1). The relatively high E values are explained by the fact that the MAPA cations are bound to the anionic framework both by electrostatic forces as well as strong N-HaEuro broken vertical bar O hydrogen bonds. The strength of the interactions is indirectly confirmed by the in situ high temperature X-ray diffraction analysis which shows that the MAPA decomposition leads to a phase transformation of the open-framework structure to the dense trydimite phase.
PB  - Springer, Dordrecht
T2  - Journal of Thermal Analysis and Calorimetry
T1  - On the thermal degradation of 3-methylaminopropylamine captured inside the aluminum phosphate analog of ULM-3
EP  - 924
IS  - 3
SP  - 919
VL  - 101
DO  - 10.1007/s10973-009-0504-7
ER  - 

@article{
author = "Rajić, Nevenka and Stojaković, Đorđe and Jevtić, Sanja and Zabukovec-Logar, Nataša and Mali, Gregor and Kaučič, Venčeslav",
year = "2010",
abstract = "An open-framework aluminophosphate analog of the fluorogallophosphate structure-type ULM-3 was obtained by hydrothermal crystallization of an aqueous aluminum phosphate suspension in the presence of 3-methylpropylamine (MAPA) and hydrofluoric acid. The open-framework fluorinated aluminophosphate structure was confirmed by Rietveld analysis and the (27)Al, (31)P, and (19)F MAS NMR spectroscopy. The MAPA, located in the ten-membered ring channels, is doubly protonated to balance the negative charge of the Al(3)P(3)O(12)F(2) (2-) framework. Thermogravimetric analysis data have been used to study kinetics of the thermal decomposition of MAPA. The decomposition was found to be a complex process, its activation energy varied from 177 to 259 kJ mol(-1). The relatively high E values are explained by the fact that the MAPA cations are bound to the anionic framework both by electrostatic forces as well as strong N-HaEuro broken vertical bar O hydrogen bonds. The strength of the interactions is indirectly confirmed by the in situ high temperature X-ray diffraction analysis which shows that the MAPA decomposition leads to a phase transformation of the open-framework structure to the dense trydimite phase.",
publisher = "Springer, Dordrecht",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "On the thermal degradation of 3-methylaminopropylamine captured inside the aluminum phosphate analog of ULM-3",
pages = "924-919",
number = "3",
volume = "101",
doi = "10.1007/s10973-009-0504-7"
}

Rajić, N., Stojaković, Đ., Jevtić, S., Zabukovec-Logar, N., Mali, G.,& Kaučič, V.. (2010). On the thermal degradation of 3-methylaminopropylamine captured inside the aluminum phosphate analog of ULM-3. in Journal of Thermal Analysis and Calorimetry
Springer, Dordrecht., 101(3), 919-924.
https://doi.org/10.1007/s10973-009-0504-7

Rajić N, Stojaković Đ, Jevtić S, Zabukovec-Logar N, Mali G, Kaučič V. On the thermal degradation of 3-methylaminopropylamine captured inside the aluminum phosphate analog of ULM-3. in Journal of Thermal Analysis and Calorimetry. 2010;101(3):919-924.
doi:10.1007/s10973-009-0504-7 .

Rajić, Nevenka, Stojaković, Đorđe, Jevtić, Sanja, Zabukovec-Logar, Nataša, Mali, Gregor, Kaučič, Venčeslav, "On the thermal degradation of 3-methylaminopropylamine captured inside the aluminum phosphate analog of ULM-3" in Journal of Thermal Analysis and Calorimetry, 101, no. 3 (2010):919-924,
https://doi.org/10.1007/s10973-009-0504-7 . .

TY  - CONF
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Jevtić, Sanja
AU  - Jovanović, Mina
AU  - Zabukovec Logar, Nataša
AU  - Mazaj, Matjaž
AU  - Kaučič, Venčeslav
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5209
PB  - University of Nova Gorica, Slovenia
C3  - 11th European Meeting on Environmental Chemistry - Book of Abstracts
T1  - On the removal of aqueous manganese, nickel and zinc ions using the natural clinoptilolite
SP  - 181
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5209
ER  - 

@conference{
author = "Rajić, Nevenka and Stojaković, Đorđe and Jevtić, Sanja and Jovanović, Mina and Zabukovec Logar, Nataša and Mazaj, Matjaž and Kaučič, Venčeslav",
year = "2010",
publisher = "University of Nova Gorica, Slovenia",
journal = "11th European Meeting on Environmental Chemistry - Book of Abstracts",
title = "On the removal of aqueous manganese, nickel and zinc ions using the natural clinoptilolite",
pages = "181",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5209"
}

Rajić, N., Stojaković, Đ., Jevtić, S., Jovanović, M., Zabukovec Logar, N., Mazaj, M.,& Kaučič, V.. (2010). On the removal of aqueous manganese, nickel and zinc ions using the natural clinoptilolite. in 11th European Meeting on Environmental Chemistry - Book of Abstracts
University of Nova Gorica, Slovenia., 181.
https://hdl.handle.net/21.15107/rcub_technorep_5209

Rajić N, Stojaković Đ, Jevtić S, Jovanović M, Zabukovec Logar N, Mazaj M, Kaučič V. On the removal of aqueous manganese, nickel and zinc ions using the natural clinoptilolite. in 11th European Meeting on Environmental Chemistry - Book of Abstracts. 2010;:181.
https://hdl.handle.net/21.15107/rcub_technorep_5209 .

Rajić, Nevenka, Stojaković, Đorđe, Jevtić, Sanja, Jovanović, Mina, Zabukovec Logar, Nataša, Mazaj, Matjaž, Kaučič, Venčeslav, "On the removal of aqueous manganese, nickel and zinc ions using the natural clinoptilolite" in 11th European Meeting on Environmental Chemistry - Book of Abstracts (2010):181,
https://hdl.handle.net/21.15107/rcub_technorep_5209 .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Jovanović, Mina
AU  - Zabukovec-Logar, Nataša
AU  - Mazaj, Matjaz
AU  - Kaučič, Venčeslav
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1726
AB  - The natural zeolite tuff (clinoptilolite) from a Serbian deposit has been studied as adsorbent for Ni(II) ions from aqueous solutions. Its sorption capacity at 298K varies from 1.9mg Nig(-1) (for the initial solution concentration of 100mg Nidm(-3)) to 3.8mg Nig(-1) (for C-0 = 600mgNidm(-3)) and it increases 3 times at 338 K. The sorption is best described by the Sips isotherm model. The sorption kinetics follows the pseudo-second-order model, the activation energies being 7.44, 5.86, 6.62 and 6.63 kJ mol(-1) for C-0 = 100, 200, 300 and 400mg Nidm(-3), respectively. The sorption involves a film diffusion, an intra-particle diffusion, and a chemical cation-exchange between the Na+ ions of clinoptilolite and the Ni2+ ions. The sorption is endothermic (Delta H degrees being 37.9, 33.4, 30.0, 27.7 and 24.3 kJ mol(-1) for C-0 = 100, 200, 300, 400 and 600mg Nidm(-3), respectively) and spontaneous in the 298-338K temperature range. Thermal treatment of the Ni(II)-loaded clinoptilolite results in the formation of spherical nano-NiO particles of approx. 5 nm in diameter which are randomly dispersed in the clinoptilolite lattice.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Surface Science
T1  - Removal of nickel(II) ions from aqueous solutions using the natural clinoptilolite and preparation of nano-NiO on the exhausted clinoptilolite
EP  - 1532
IS  - 5
SP  - 1524
VL  - 257
DO  - 10.1016/j.apsusc.2010.08.090
ER  - 

@article{
author = "Rajić, Nevenka and Stojaković, Đorđe and Jovanović, Mina and Zabukovec-Logar, Nataša and Mazaj, Matjaz and Kaučič, Venčeslav",
year = "2010",
abstract = "The natural zeolite tuff (clinoptilolite) from a Serbian deposit has been studied as adsorbent for Ni(II) ions from aqueous solutions. Its sorption capacity at 298K varies from 1.9mg Nig(-1) (for the initial solution concentration of 100mg Nidm(-3)) to 3.8mg Nig(-1) (for C-0 = 600mgNidm(-3)) and it increases 3 times at 338 K. The sorption is best described by the Sips isotherm model. The sorption kinetics follows the pseudo-second-order model, the activation energies being 7.44, 5.86, 6.62 and 6.63 kJ mol(-1) for C-0 = 100, 200, 300 and 400mg Nidm(-3), respectively. The sorption involves a film diffusion, an intra-particle diffusion, and a chemical cation-exchange between the Na+ ions of clinoptilolite and the Ni2+ ions. The sorption is endothermic (Delta H degrees being 37.9, 33.4, 30.0, 27.7 and 24.3 kJ mol(-1) for C-0 = 100, 200, 300, 400 and 600mg Nidm(-3), respectively) and spontaneous in the 298-338K temperature range. Thermal treatment of the Ni(II)-loaded clinoptilolite results in the formation of spherical nano-NiO particles of approx. 5 nm in diameter which are randomly dispersed in the clinoptilolite lattice.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Surface Science",
title = "Removal of nickel(II) ions from aqueous solutions using the natural clinoptilolite and preparation of nano-NiO on the exhausted clinoptilolite",
pages = "1532-1524",
number = "5",
volume = "257",
doi = "10.1016/j.apsusc.2010.08.090"
}

Rajić, N., Stojaković, Đ., Jovanović, M., Zabukovec-Logar, N., Mazaj, M.,& Kaučič, V.. (2010). Removal of nickel(II) ions from aqueous solutions using the natural clinoptilolite and preparation of nano-NiO on the exhausted clinoptilolite. in Applied Surface Science
Elsevier Science Bv, Amsterdam., 257(5), 1524-1532.
https://doi.org/10.1016/j.apsusc.2010.08.090

Rajić N, Stojaković Đ, Jovanović M, Zabukovec-Logar N, Mazaj M, Kaučič V. Removal of nickel(II) ions from aqueous solutions using the natural clinoptilolite and preparation of nano-NiO on the exhausted clinoptilolite. in Applied Surface Science. 2010;257(5):1524-1532.
doi:10.1016/j.apsusc.2010.08.090 .

Rajić, Nevenka, Stojaković, Đorđe, Jovanović, Mina, Zabukovec-Logar, Nataša, Mazaj, Matjaz, Kaučič, Venčeslav, "Removal of nickel(II) ions from aqueous solutions using the natural clinoptilolite and preparation of nano-NiO on the exhausted clinoptilolite" in Applied Surface Science, 257, no. 5 (2010):1524-1532,
https://doi.org/10.1016/j.apsusc.2010.08.090 . .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Jevtić, Sanja
AU  - Zabukovec-Logar, Nataša
AU  - Kovač, Janez
AU  - Kaučič, Venčeslav
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1467
AB  - The natural zeolite tuff from the Vranjska Banja deposit (Serbia) has been studied as sorbent for Mn(II) ions from aqueous solutions. The zeolite sample containing mainly clinoptilolite (more than 70%) removes Mn(II) ions by ion-exchange process, which was confirmed by X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray analysis (EDXS). XPS showed that there is no surface accumulation of Mn but an almost uniform distribution inside the sorbent; EDXS confirmed that Mn(II) replaced the clinoptilolite Na counter ions. The sorption isotherms were studied at 298 K by batch experiments showing that the Mn(II) removal is best described by the Langmuir-Freundlich or Sips model. The kinetics followed the pseudo-second-order model, the activation energy being 128 kJ mol(-1). The intra-particle diffusion is not the rate-controlling step in the sorption of Mn(II) on clinoptilolite. Thermodynamic data suggest spontaneity of the endothermic ion-exchange process in the 298-338 K range.
PB  - Elsevier, Amsterdam
T2  - Journal of Hazardous Materials
T1  - Removal of aqueous manganese using the natural zeolitic tuff from the Vranjska Banja deposit in Serbia
EP  - 1457
IS  - 2-3
SP  - 1450
VL  - 172
DO  - 10.1016/j.jhazmat.2009.08.011
ER  - 

@article{
author = "Rajić, Nevenka and Stojaković, Đorđe and Jevtić, Sanja and Zabukovec-Logar, Nataša and Kovač, Janez and Kaučič, Venčeslav",
year = "2009",
abstract = "The natural zeolite tuff from the Vranjska Banja deposit (Serbia) has been studied as sorbent for Mn(II) ions from aqueous solutions. The zeolite sample containing mainly clinoptilolite (more than 70%) removes Mn(II) ions by ion-exchange process, which was confirmed by X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray analysis (EDXS). XPS showed that there is no surface accumulation of Mn but an almost uniform distribution inside the sorbent; EDXS confirmed that Mn(II) replaced the clinoptilolite Na counter ions. The sorption isotherms were studied at 298 K by batch experiments showing that the Mn(II) removal is best described by the Langmuir-Freundlich or Sips model. The kinetics followed the pseudo-second-order model, the activation energy being 128 kJ mol(-1). The intra-particle diffusion is not the rate-controlling step in the sorption of Mn(II) on clinoptilolite. Thermodynamic data suggest spontaneity of the endothermic ion-exchange process in the 298-338 K range.",
publisher = "Elsevier, Amsterdam",
journal = "Journal of Hazardous Materials",
title = "Removal of aqueous manganese using the natural zeolitic tuff from the Vranjska Banja deposit in Serbia",
pages = "1457-1450",
number = "2-3",
volume = "172",
doi = "10.1016/j.jhazmat.2009.08.011"
}

Rajić, N., Stojaković, Đ., Jevtić, S., Zabukovec-Logar, N., Kovač, J.,& Kaučič, V.. (2009). Removal of aqueous manganese using the natural zeolitic tuff from the Vranjska Banja deposit in Serbia. in Journal of Hazardous Materials
Elsevier, Amsterdam., 172(2-3), 1450-1457.
https://doi.org/10.1016/j.jhazmat.2009.08.011

Rajić N, Stojaković Đ, Jevtić S, Zabukovec-Logar N, Kovač J, Kaučič V. Removal of aqueous manganese using the natural zeolitic tuff from the Vranjska Banja deposit in Serbia. in Journal of Hazardous Materials. 2009;172(2-3):1450-1457.
doi:10.1016/j.jhazmat.2009.08.011 .

Rajić, Nevenka, Stojaković, Đorđe, Jevtić, Sanja, Zabukovec-Logar, Nataša, Kovač, Janez, Kaučič, Venčeslav, "Removal of aqueous manganese using the natural zeolitic tuff from the Vranjska Banja deposit in Serbia" in Journal of Hazardous Materials, 172, no. 2-3 (2009):1450-1457,
https://doi.org/10.1016/j.jhazmat.2009.08.011 . .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Recnik, Aleksander
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1470
AB  - Thermogravimetrical analysis has been used to study the kinetics of thermal deamination of bis(ethylenediamine) nickel(II)-containing aluminophosphate (Ni-CHA) which is a precursor of nickel(II)-containing chabazite-like AlPO4-34. The deamination occurs as a single-step kinetic process which is best described by the contracting cylinder model. The obtained activation energy of 200 kJ/mol is mainly a reflection of the strong Ni-N coordination bond. The thermal decomposition of Ni-CHA results in the deposition of crystalline NiO particles homogeneously dispersed in the AlPO4-34 lattice. Average particle size was found to be about 5 nm. The study confirms that the thermal decomposition of amine complexes of Ni(II) encapsulated inside the microporous aluminophosphate host can be a suitable method for obtaining fine nano-oxide particles.
PB  - Elsevier Science Sa, Lausanne
T2  - Inorganica Chimica Acta
T1  - Thermal deamination kinetics of the nickel-containing chabazite-like aluminophosphate, Ni(NH2-CH2-CH2-NH2)(2)(AlPO4)(6)(OH)(2), deposition of nanocrystalline NiO particles
EP  - 5143
IS  - 15
SP  - 5139
VL  - 362
DO  - 10.1016/j.ica.2009.09.007
ER  - 

@article{
author = "Rajić, Nevenka and Stojaković, Đorđe and Recnik, Aleksander",
year = "2009",
abstract = "Thermogravimetrical analysis has been used to study the kinetics of thermal deamination of bis(ethylenediamine) nickel(II)-containing aluminophosphate (Ni-CHA) which is a precursor of nickel(II)-containing chabazite-like AlPO4-34. The deamination occurs as a single-step kinetic process which is best described by the contracting cylinder model. The obtained activation energy of 200 kJ/mol is mainly a reflection of the strong Ni-N coordination bond. The thermal decomposition of Ni-CHA results in the deposition of crystalline NiO particles homogeneously dispersed in the AlPO4-34 lattice. Average particle size was found to be about 5 nm. The study confirms that the thermal decomposition of amine complexes of Ni(II) encapsulated inside the microporous aluminophosphate host can be a suitable method for obtaining fine nano-oxide particles.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Inorganica Chimica Acta",
title = "Thermal deamination kinetics of the nickel-containing chabazite-like aluminophosphate, Ni(NH2-CH2-CH2-NH2)(2)(AlPO4)(6)(OH)(2), deposition of nanocrystalline NiO particles",
pages = "5143-5139",
number = "15",
volume = "362",
doi = "10.1016/j.ica.2009.09.007"
}

Rajić, N., Stojaković, Đ.,& Recnik, A.. (2009). Thermal deamination kinetics of the nickel-containing chabazite-like aluminophosphate, Ni(NH2-CH2-CH2-NH2)(2)(AlPO4)(6)(OH)(2), deposition of nanocrystalline NiO particles. in Inorganica Chimica Acta
Elsevier Science Sa, Lausanne., 362(15), 5139-5143.
https://doi.org/10.1016/j.ica.2009.09.007

Rajić N, Stojaković Đ, Recnik A. Thermal deamination kinetics of the nickel-containing chabazite-like aluminophosphate, Ni(NH2-CH2-CH2-NH2)(2)(AlPO4)(6)(OH)(2), deposition of nanocrystalline NiO particles. in Inorganica Chimica Acta. 2009;362(15):5139-5143.
doi:10.1016/j.ica.2009.09.007 .

Rajić, Nevenka, Stojaković, Đorđe, Recnik, Aleksander, "Thermal deamination kinetics of the nickel-containing chabazite-like aluminophosphate, Ni(NH2-CH2-CH2-NH2)(2)(AlPO4)(6)(OH)(2), deposition of nanocrystalline NiO particles" in Inorganica Chimica Acta, 362, no. 15 (2009):5139-5143,
https://doi.org/10.1016/j.ica.2009.09.007 . .

TY  - JOUR
AU  - Stojaković, Đorđe
AU  - Rajić, Nevenka
AU  - Rakić, Vesna M.
AU  - Zabukovec-Logar, Nataša
AU  - Kaučič, Venčeslav
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1519
AB  - A zinc phosphate with the composition [NH3-CH2-CH(NH3)-CH3](ZnPO4)(2), containing the doubly protonated 1,2-diaminopropane (abbr. HDAP), was synthesized by hydrothermal crystallization of zinc nitrate, phosphoric acid, 1,2-diaminopropane and trimethylenedipiperidine. The single crystal analysis shows a layered inorganic-organic structure built up of a sandwich-like motif of alternating inorganic layers and HDAP cations (trimethylenedipiperidine not being a constituent of the structure). The HDAP species are found to be disordered and serve as bridges between two adjacent inorganic layers which are separated by 3.95 angstrom. The bridging interaction occurs via a hydrogen-bonding network. The inorganic layer features a pattern of four-membered rings involving two ZnO4 and two PO4 tetrahedra connected by sharing O atoms. Thermal analysis shows that the compound is stable up to 370 degrees C and that the thermal decomposition of HDAP occurs in two steps between 370 and 460 degrees C, causing the collapse of the structure. The first decomposition step corresponds to ammonia removal which proceeds with a high activation energy (E-a = 282 kJ mol (1)). The high E-a value is mainly attributed to strong electrostatic interactions between organic cations and anionic inorganic layers, the disruption of the interactions being the main reason for structural collapse after the HDAP removal.
PB  - Elsevier Science Sa, Lausanne
T2  - Inorganica Chimica Acta
T1  - Structure and thermal behavior of the layered zincophosphate [NH3-CH2-CH(NH3)-CH3](ZnPO4)(2)
EP  - 1995
IS  - 6
SP  - 1991
VL  - 362
DO  - 10.1016/j.ica.2008.09.020
ER  - 

@article{
author = "Stojaković, Đorđe and Rajić, Nevenka and Rakić, Vesna M. and Zabukovec-Logar, Nataša and Kaučič, Venčeslav",
year = "2009",
abstract = "A zinc phosphate with the composition [NH3-CH2-CH(NH3)-CH3](ZnPO4)(2), containing the doubly protonated 1,2-diaminopropane (abbr. HDAP), was synthesized by hydrothermal crystallization of zinc nitrate, phosphoric acid, 1,2-diaminopropane and trimethylenedipiperidine. The single crystal analysis shows a layered inorganic-organic structure built up of a sandwich-like motif of alternating inorganic layers and HDAP cations (trimethylenedipiperidine not being a constituent of the structure). The HDAP species are found to be disordered and serve as bridges between two adjacent inorganic layers which are separated by 3.95 angstrom. The bridging interaction occurs via a hydrogen-bonding network. The inorganic layer features a pattern of four-membered rings involving two ZnO4 and two PO4 tetrahedra connected by sharing O atoms. Thermal analysis shows that the compound is stable up to 370 degrees C and that the thermal decomposition of HDAP occurs in two steps between 370 and 460 degrees C, causing the collapse of the structure. The first decomposition step corresponds to ammonia removal which proceeds with a high activation energy (E-a = 282 kJ mol (1)). The high E-a value is mainly attributed to strong electrostatic interactions between organic cations and anionic inorganic layers, the disruption of the interactions being the main reason for structural collapse after the HDAP removal.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Inorganica Chimica Acta",
title = "Structure and thermal behavior of the layered zincophosphate [NH3-CH2-CH(NH3)-CH3](ZnPO4)(2)",
pages = "1995-1991",
number = "6",
volume = "362",
doi = "10.1016/j.ica.2008.09.020"
}

Stojaković, Đ., Rajić, N., Rakić, V. M., Zabukovec-Logar, N.,& Kaučič, V.. (2009). Structure and thermal behavior of the layered zincophosphate [NH3-CH2-CH(NH3)-CH3](ZnPO4)(2). in Inorganica Chimica Acta
Elsevier Science Sa, Lausanne., 362(6), 1991-1995.
https://doi.org/10.1016/j.ica.2008.09.020

Stojaković Đ, Rajić N, Rakić VM, Zabukovec-Logar N, Kaučič V. Structure and thermal behavior of the layered zincophosphate [NH3-CH2-CH(NH3)-CH3](ZnPO4)(2). in Inorganica Chimica Acta. 2009;362(6):1991-1995.
doi:10.1016/j.ica.2008.09.020 .

Stojaković, Đorđe, Rajić, Nevenka, Rakić, Vesna M., Zabukovec-Logar, Nataša, Kaučič, Venčeslav, "Structure and thermal behavior of the layered zincophosphate [NH3-CH2-CH(NH3)-CH3](ZnPO4)(2)" in Inorganica Chimica Acta, 362, no. 6 (2009):1991-1995,
https://doi.org/10.1016/j.ica.2008.09.020 . .

TY  - CONF
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Mrak, Maja
AU  - Kaučič, Venčeslav
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6408
AB  - An efficient removal of the organic component from the as-synthesized solid in order to access the
internal free space is an important step in the final preparation of the porous materials. Recently, kinetic studies of the cetyltrimethylammonium bromide (CTMAB) removal from the MCM-41 and MCM-48 have shown that the CTMAB removal proceeds by very high activation energy indicating that the interactions of the CTMAB with silica framework are very strong. Preparation of mesoporous SBA-3 proceeds also in the presence of CTMAB; however, in contrast to the synthesis of MCM-41 and MCM-48 which is carried out under alkaline conditions, crystallization of the SBA-3 occurs in strongly acidic solution. This causes the interaction of CTMAB with the SBA-3 network to be different from its interaction with the MCM network since the SBA-3 network is electrically neutral while the MCM network is negatively charged. Thermal degradation of CTMAB inside the mesoporous SBA-3 has been studied under non-isothermal conditions. There are two distinct kinetic processes, which can be described by the Sestak-Berggren model. The main decomposition step proceeds with Ea = 116±2 kJ/mol which is significantly lower than for the MCM-41 and MCM-48, suggesting that the interaction between CTMAB and the silica network is the dominant factor in the removal of the surfactant. The second decomposition step has a higher Ea  value (153±5 kJ/mol) than the first step, indicating that it is primarily controlled by the size of the pore openings.
C3  - 4th FEZA CONFERENCE Collège de France PARIS
T1  - A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve
IS  - PIII-G34
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6408
ER  - 

@conference{
author = "Rajić, Nevenka and Stojaković, Đorđe and Mrak, Maja and Kaučič, Venčeslav",
year = "2008",
abstract = "An efficient removal of the organic component from the as-synthesized solid in order to access the
internal free space is an important step in the final preparation of the porous materials. Recently, kinetic studies of the cetyltrimethylammonium bromide (CTMAB) removal from the MCM-41 and MCM-48 have shown that the CTMAB removal proceeds by very high activation energy indicating that the interactions of the CTMAB with silica framework are very strong. Preparation of mesoporous SBA-3 proceeds also in the presence of CTMAB; however, in contrast to the synthesis of MCM-41 and MCM-48 which is carried out under alkaline conditions, crystallization of the SBA-3 occurs in strongly acidic solution. This causes the interaction of CTMAB with the SBA-3 network to be different from its interaction with the MCM network since the SBA-3 network is electrically neutral while the MCM network is negatively charged. Thermal degradation of CTMAB inside the mesoporous SBA-3 has been studied under non-isothermal conditions. There are two distinct kinetic processes, which can be described by the Sestak-Berggren model. The main decomposition step proceeds with Ea = 116±2 kJ/mol which is significantly lower than for the MCM-41 and MCM-48, suggesting that the interaction between CTMAB and the silica network is the dominant factor in the removal of the surfactant. The second decomposition step has a higher Ea  value (153±5 kJ/mol) than the first step, indicating that it is primarily controlled by the size of the pore openings.",
journal = "4th FEZA CONFERENCE Collège de France PARIS",
title = "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve",
number = "PIII-G34",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6408"
}

Rajić, N., Stojaković, Đ., Mrak, M.,& Kaučič, V.. (2008). A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in 4th FEZA CONFERENCE Collège de France PARIS(PIII-G34).
https://hdl.handle.net/21.15107/rcub_technorep_6408

Rajić N, Stojaković Đ, Mrak M, Kaučič V. A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in 4th FEZA CONFERENCE Collège de France PARIS. 2008;(PIII-G34).
https://hdl.handle.net/21.15107/rcub_technorep_6408 .

Rajić, Nevenka, Stojaković, Đorđe, Mrak, Maja, Kaučič, Venčeslav, "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve" in 4th FEZA CONFERENCE Collège de France PARIS, no. PIII-G34 (2008),
https://hdl.handle.net/21.15107/rcub_technorep_6408 .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Mrak, Maja
AU  - Kaučič, Venčeslav
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1352
AB  - Thermal degradation of cetyltrimethylammonium bromide (CTMAB) inside the mesoporous SBA-3 has been studied under non-isothermal conditions. There are two distinct although partly overlapping kinetic processes, and both of them can be described by the Sestak-Berggren model. The main decomposition step proceeds with E(a) = 116 +/- 2 kJ/mol which is significantly lower than for the mesoporous MCM-41 and MCM-48 suggesting that the interaction between CTMAB and the silica network plays a crucial role in the removal of the surfactant from the as-synthesized material. The second decomposition step has a higher E(a) value (E(a) = 153 +/- 5 kJ/mol) than the first step, indicating that it is primarily controlled by the size of the pore openings.
PB  - Elsevier Science Bv, Amsterdam
T2  - Zeolites and Related Materials: Trends, Targets and Challenges, Proceedings of the 4th International
T1  - A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve
EP  - 980
SP  - 977
VL  - 174
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1352
ER  - 

@article{
author = "Rajić, Nevenka and Stojaković, Đorđe and Mrak, Maja and Kaučič, Venčeslav",
year = "2008",
abstract = "Thermal degradation of cetyltrimethylammonium bromide (CTMAB) inside the mesoporous SBA-3 has been studied under non-isothermal conditions. There are two distinct although partly overlapping kinetic processes, and both of them can be described by the Sestak-Berggren model. The main decomposition step proceeds with E(a) = 116 +/- 2 kJ/mol which is significantly lower than for the mesoporous MCM-41 and MCM-48 suggesting that the interaction between CTMAB and the silica network plays a crucial role in the removal of the surfactant from the as-synthesized material. The second decomposition step has a higher E(a) value (E(a) = 153 +/- 5 kJ/mol) than the first step, indicating that it is primarily controlled by the size of the pore openings.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Zeolites and Related Materials: Trends, Targets and Challenges, Proceedings of the 4th International",
title = "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve",
pages = "980-977",
volume = "174",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1352"
}

Rajić, N., Stojaković, Đ., Mrak, M.,& Kaučič, V.. (2008). A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in Zeolites and Related Materials: Trends, Targets and Challenges, Proceedings of the 4th International
Elsevier Science Bv, Amsterdam., 174, 977-980.
https://hdl.handle.net/21.15107/rcub_technorep_1352

Rajić N, Stojaković Đ, Mrak M, Kaučič V. A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in Zeolites and Related Materials: Trends, Targets and Challenges, Proceedings of the 4th International. 2008;174:977-980.
https://hdl.handle.net/21.15107/rcub_technorep_1352 .

Rajić, Nevenka, Stojaković, Đorđe, Mrak, Maja, Kaučič, Venčeslav, "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve" in Zeolites and Related Materials: Trends, Targets and Challenges, Proceedings of the 4th International, 174 (2008):977-980,
https://hdl.handle.net/21.15107/rcub_technorep_1352 .

TY  - JOUR
AU  - Stojaković, Đorđe
AU  - Rajić, Nevenka
AU  - Mrak, Maja
AU  - Kaučič, Venčeslav
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1110
AB  - The thermal degradation of cetyltrimethylammonium bromide (CTMAB) inside the mesoporous SBA-3 was studied under non-isothermal conditions. There are two distinct and complex kinetic processes which partly overlap, each consisting of one dominant and three minor individual processes. The two dominant processes can be described by the Sestak-Berggren model. The main decomposition step (the first dominant process) involves the overcoming of weak interactions between CTMAB and the silica network and proceeds with a lower Ea value (116±2 kJ mol-1) than the second dominant process (153±5 kJ mol-1), which can be explained by the size reduction of the pore openings due to the contraction of the SBA-3 unit cell caused by the removal of CTMAB.
AB  - Izučavano je termičko razlaganje pod neizotermskim uslovima cetiltrimetilamonijum-bromida (CTMAB) unutar mezoporoznog SBA-3. Postoje dva razgovetna i složena kinetička procesa koji se delimično preklapaju, pri čemu se oba sastoje od po jednog preovlađujućeg i tri sporedna individualna procesa. Dva preovlađujuća procesa mogu se opisati pomoću Šestak-Bergrenovog modela. U glavnom stupnju razlaganja (u prvom preovlađujućem procesu) bivaju nadvladane slabe interakcije između CTMAB i rešetke silicijum-dioksida, i taj stupanj se odvija uz manju vrednost Ea (116±2 kJ mol-1). Drugom preovlađujućem procesu odgovara veća vrednost Ea (153±5 kJ mol-1) nego prvom procesu, što se može objasniti smanjenjem veličine otvora pora usled kontrakcije jedinične ćelije SBA-3 izazvane uklanjanjem cetiltrimetilamonijum-bromida.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve
T1  - Kinetičko izučavanje termičkog razlaganja cetiltrimetilamonijum−bromida unutar mezoporoznog molekulskog sita SBA-3
EP  - 1319
IS  - 12
SP  - 1309
VL  - 72
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1110
ER  - 

@article{
author = "Stojaković, Đorđe and Rajić, Nevenka and Mrak, Maja and Kaučič, Venčeslav",
year = "2007",
abstract = "The thermal degradation of cetyltrimethylammonium bromide (CTMAB) inside the mesoporous SBA-3 was studied under non-isothermal conditions. There are two distinct and complex kinetic processes which partly overlap, each consisting of one dominant and three minor individual processes. The two dominant processes can be described by the Sestak-Berggren model. The main decomposition step (the first dominant process) involves the overcoming of weak interactions between CTMAB and the silica network and proceeds with a lower Ea value (116±2 kJ mol-1) than the second dominant process (153±5 kJ mol-1), which can be explained by the size reduction of the pore openings due to the contraction of the SBA-3 unit cell caused by the removal of CTMAB., Izučavano je termičko razlaganje pod neizotermskim uslovima cetiltrimetilamonijum-bromida (CTMAB) unutar mezoporoznog SBA-3. Postoje dva razgovetna i složena kinetička procesa koji se delimično preklapaju, pri čemu se oba sastoje od po jednog preovlađujućeg i tri sporedna individualna procesa. Dva preovlađujuća procesa mogu se opisati pomoću Šestak-Bergrenovog modela. U glavnom stupnju razlaganja (u prvom preovlađujućem procesu) bivaju nadvladane slabe interakcije između CTMAB i rešetke silicijum-dioksida, i taj stupanj se odvija uz manju vrednost Ea (116±2 kJ mol-1). Drugom preovlađujućem procesu odgovara veća vrednost Ea (153±5 kJ mol-1) nego prvom procesu, što se može objasniti smanjenjem veličine otvora pora usled kontrakcije jedinične ćelije SBA-3 izazvane uklanjanjem cetiltrimetilamonijum-bromida.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve, Kinetičko izučavanje termičkog razlaganja cetiltrimetilamonijum−bromida unutar mezoporoznog molekulskog sita SBA-3",
pages = "1319-1309",
number = "12",
volume = "72",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1110"
}

Stojaković, Đ., Rajić, N., Mrak, M.,& Kaučič, V.. (2007). A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 72(12), 1309-1319.
https://hdl.handle.net/21.15107/rcub_technorep_1110

Stojaković Đ, Rajić N, Mrak M, Kaučič V. A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in Journal of the Serbian Chemical Society. 2007;72(12):1309-1319.
https://hdl.handle.net/21.15107/rcub_technorep_1110 .

Stojaković, Đorđe, Rajić, Nevenka, Mrak, Maja, Kaučič, Venčeslav, "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve" in Journal of the Serbian Chemical Society, 72, no. 12 (2007):1309-1319,
https://hdl.handle.net/21.15107/rcub_technorep_1110 .

TY  - JOUR
AU  - Stojaković, Đorđe
AU  - Rajić, Nevenka
AU  - Zabukovec-Logar, Nataša
AU  - Kaučič, Venčeslav
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/910
AB  - Ammonium ions remain inside the 3D zincophosphate framework after the hydrothermal crystallization. These species in co-operation with sodium cations exert a specific templating role in the formation of the open-framework lattice. The decomposition of the ammonium species under non-isothermal conditions has been studied by the non-parametric kinetics (NPK) method. The process is characterized by a complex kinetic mechanism and a relatively high activation energy for the main reaction step, E-a = 336 kJ/mol. These reflect the fact that the decomposition of the ammonium ions inside the zincophosphate framework involves not only the diffusion of the liberated species through the narrow channels of the microporous framework but also a prior overcoming of strong electrostatic interactions and the breaking of hydrogen bonds.
PB  - Elsevier Science Bv, Amsterdam
T2  - Thermochimica Acta
T1  - A kinetic study of the thermal degradation of ammonium species inside a 3D zincophosphate
EP  - 46
IS  - 1-2
SP  - 42
VL  - 449
DO  - 10.1016/j.tca.2006.07.013
ER  - 

@article{
author = "Stojaković, Đorđe and Rajić, Nevenka and Zabukovec-Logar, Nataša and Kaučič, Venčeslav",
year = "2006",
abstract = "Ammonium ions remain inside the 3D zincophosphate framework after the hydrothermal crystallization. These species in co-operation with sodium cations exert a specific templating role in the formation of the open-framework lattice. The decomposition of the ammonium species under non-isothermal conditions has been studied by the non-parametric kinetics (NPK) method. The process is characterized by a complex kinetic mechanism and a relatively high activation energy for the main reaction step, E-a = 336 kJ/mol. These reflect the fact that the decomposition of the ammonium ions inside the zincophosphate framework involves not only the diffusion of the liberated species through the narrow channels of the microporous framework but also a prior overcoming of strong electrostatic interactions and the breaking of hydrogen bonds.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Thermochimica Acta",
title = "A kinetic study of the thermal degradation of ammonium species inside a 3D zincophosphate",
pages = "46-42",
number = "1-2",
volume = "449",
doi = "10.1016/j.tca.2006.07.013"
}

Stojaković, Đ., Rajić, N., Zabukovec-Logar, N.,& Kaučič, V.. (2006). A kinetic study of the thermal degradation of ammonium species inside a 3D zincophosphate. in Thermochimica Acta
Elsevier Science Bv, Amsterdam., 449(1-2), 42-46.
https://doi.org/10.1016/j.tca.2006.07.013

Stojaković Đ, Rajić N, Zabukovec-Logar N, Kaučič V. A kinetic study of the thermal degradation of ammonium species inside a 3D zincophosphate. in Thermochimica Acta. 2006;449(1-2):42-46.
doi:10.1016/j.tca.2006.07.013 .

Stojaković, Đorđe, Rajić, Nevenka, Zabukovec-Logar, Nataša, Kaučič, Venčeslav, "A kinetic study of the thermal degradation of ammonium species inside a 3D zincophosphate" in Thermochimica Acta, 449, no. 1-2 (2006):42-46,
https://doi.org/10.1016/j.tca.2006.07.013 . .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Zabukovec-Logar, Nataša
AU  - Mali, Gregor
AU  - Stojaković, Đorđe
AU  - Kaučič, Venčeslav
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/859
AB  - Three dicarboxylic acids (oxalic, malonic and terephthalic) were investigated as possible pillars in the formation of metallophosphates with extended structures in the presence of 1,2-diaminopropane (DAP) as a structure-directing agent. Only the oxalate ion was proven to be a suitable building block in the formation of hybrid networks. The terephthalate ion seems to possess the ability to be structurally involved in lattice formation, although not in networks of the hybrid type. The malonate ion in this system showed no propensity towards lattice formation, i.e., malonic acid merely exits as an intercalated species inside the 2-D zincophosphate structure. Different pillar-functioning ability has been attributed to structural differences of the three dicarboxylate ions.
PB  - Croatian Chemical Society
T2  - Croatica Chemica Acta
T1  - On a possible role of dicarboxylate ions in the formation of open-framework metallophosphates
EP  - 193
IS  - 2
SP  - 187
VL  - 79
UR  - https://hdl.handle.net/21.15107/rcub_technorep_859
ER  - 

@article{
author = "Rajić, Nevenka and Zabukovec-Logar, Nataša and Mali, Gregor and Stojaković, Đorđe and Kaučič, Venčeslav",
year = "2006",
abstract = "Three dicarboxylic acids (oxalic, malonic and terephthalic) were investigated as possible pillars in the formation of metallophosphates with extended structures in the presence of 1,2-diaminopropane (DAP) as a structure-directing agent. Only the oxalate ion was proven to be a suitable building block in the formation of hybrid networks. The terephthalate ion seems to possess the ability to be structurally involved in lattice formation, although not in networks of the hybrid type. The malonate ion in this system showed no propensity towards lattice formation, i.e., malonic acid merely exits as an intercalated species inside the 2-D zincophosphate structure. Different pillar-functioning ability has been attributed to structural differences of the three dicarboxylate ions.",
publisher = "Croatian Chemical Society",
journal = "Croatica Chemica Acta",
title = "On a possible role of dicarboxylate ions in the formation of open-framework metallophosphates",
pages = "193-187",
number = "2",
volume = "79",
url = "https://hdl.handle.net/21.15107/rcub_technorep_859"
}

Rajić, N., Zabukovec-Logar, N., Mali, G., Stojaković, Đ.,& Kaučič, V.. (2006). On a possible role of dicarboxylate ions in the formation of open-framework metallophosphates. in Croatica Chemica Acta
Croatian Chemical Society., 79(2), 187-193.
https://hdl.handle.net/21.15107/rcub_technorep_859

Rajić N, Zabukovec-Logar N, Mali G, Stojaković Đ, Kaučič V. On a possible role of dicarboxylate ions in the formation of open-framework metallophosphates. in Croatica Chemica Acta. 2006;79(2):187-193.
https://hdl.handle.net/21.15107/rcub_technorep_859 .

Rajić, Nevenka, Zabukovec-Logar, Nataša, Mali, Gregor, Stojaković, Đorđe, Kaučič, Venčeslav, "On a possible role of dicarboxylate ions in the formation of open-framework metallophosphates" in Croatica Chemica Acta, 79, no. 2 (2006):187-193,
https://hdl.handle.net/21.15107/rcub_technorep_859 .

TY  - CONF
AU  - Rajić, Nevenka
AU  - Zabukovec Logar, Nataša
AU  - Šajić, Sanja
AU  - Stojaković, Đorđe
AU  - Kaučič, Venčeslav
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6406
AB  - Recently, a considerable interest has been directed towards the synthesis of hybrid organic-inorganic solids, which exhibit an enhanced structural versatility, original electronic, magnetic and
optical properties. Also, some of these crystalline metal-organic frameworks can reversibly occlude large amounts of gases, which makes them suitable for gas storage materials for hydrogen-fueled
vehicles and portable electronics. Rigid aromatic dicarboxylates have been explored as appropriate building units for construction of organic backbone, while zinc ions because of their ability to accommodate various coordination modes, have usually been selected to generate open architecture. Here we report the synthesis and structures of two metal-organic frameworks ZnBDC-I and ZnBDC-II (BDC - 1,4-benzenedicarboxylate). Both compounds have been isolated after crystallization of a nlixture containing zinc nitrate, N a2BDC and water. The crystallization was performed under microwave heating for 1 hour at 180 deg. C. The structure of I consists of metal-organic zigzag chains in which tetrahedral Zn centres are linked by BDU acting as bridging bidentate ligands. The structure of II is a 3-D network arising through interconnection of the
square-pyramidal Zn units and BDC ions. Each BDC is coordinated to four Zn atoms. It seems likely that interactions between zinc centres and the terminal C=O groups of the chains in I lead to the formation of the 3-D open framework II. This structural relationship between I and II gives an insight into the possible pathways in the building process of metal-organic networks. In accord with this observation it includes a transformation of I-D chain to 3-D open framework. (Crystal data for I are as follows: monoclinic system, C 2/c, a=1.50262(6), b=0.50422(2), c=1.21132(6) nm, beta=103.900(2)deg.; for II - monoclinic system, C 2/c, a=1.79978(5), b=0.63647(1), c=0.72657(2) nm, beta=91.467(1)deg.).
PB  - The Materials Research Society Symposium Proceedings Series
C3  - MRS Spring Meeting & Exhibit
T1  - Novel Metal-Organic Frameworks: Microwave Crystallization and Structure
EP  - 674
SP  - 667
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6406
ER  - 

@conference{
author = "Rajić, Nevenka and Zabukovec Logar, Nataša and Šajić, Sanja and Stojaković, Đorđe and Kaučič, Venčeslav",
year = "2005",
abstract = "Recently, a considerable interest has been directed towards the synthesis of hybrid organic-inorganic solids, which exhibit an enhanced structural versatility, original electronic, magnetic and
optical properties. Also, some of these crystalline metal-organic frameworks can reversibly occlude large amounts of gases, which makes them suitable for gas storage materials for hydrogen-fueled
vehicles and portable electronics. Rigid aromatic dicarboxylates have been explored as appropriate building units for construction of organic backbone, while zinc ions because of their ability to accommodate various coordination modes, have usually been selected to generate open architecture. Here we report the synthesis and structures of two metal-organic frameworks ZnBDC-I and ZnBDC-II (BDC - 1,4-benzenedicarboxylate). Both compounds have been isolated after crystallization of a nlixture containing zinc nitrate, N a2BDC and water. The crystallization was performed under microwave heating for 1 hour at 180 deg. C. The structure of I consists of metal-organic zigzag chains in which tetrahedral Zn centres are linked by BDU acting as bridging bidentate ligands. The structure of II is a 3-D network arising through interconnection of the
square-pyramidal Zn units and BDC ions. Each BDC is coordinated to four Zn atoms. It seems likely that interactions between zinc centres and the terminal C=O groups of the chains in I lead to the formation of the 3-D open framework II. This structural relationship between I and II gives an insight into the possible pathways in the building process of metal-organic networks. In accord with this observation it includes a transformation of I-D chain to 3-D open framework. (Crystal data for I are as follows: monoclinic system, C 2/c, a=1.50262(6), b=0.50422(2), c=1.21132(6) nm, beta=103.900(2)deg.; for II - monoclinic system, C 2/c, a=1.79978(5), b=0.63647(1), c=0.72657(2) nm, beta=91.467(1)deg.).",
publisher = "The Materials Research Society Symposium Proceedings Series",
journal = "MRS Spring Meeting & Exhibit",
title = "Novel Metal-Organic Frameworks: Microwave Crystallization and Structure",
pages = "674-667",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6406"
}

Rajić, N., Zabukovec Logar, N., Šajić, S., Stojaković, Đ.,& Kaučič, V.. (2005). Novel Metal-Organic Frameworks: Microwave Crystallization and Structure. in MRS Spring Meeting & Exhibit
The Materials Research Society Symposium Proceedings Series., 667-674.
https://hdl.handle.net/21.15107/rcub_technorep_6406

Rajić N, Zabukovec Logar N, Šajić S, Stojaković Đ, Kaučič V. Novel Metal-Organic Frameworks: Microwave Crystallization and Structure. in MRS Spring Meeting & Exhibit. 2005;:667-674.
https://hdl.handle.net/21.15107/rcub_technorep_6406 .

Rajić, Nevenka, Zabukovec Logar, Nataša, Šajić, Sanja, Stojaković, Đorđe, Kaučič, Venčeslav, "Novel Metal-Organic Frameworks: Microwave Crystallization and Structure" in MRS Spring Meeting & Exhibit (2005):667-674,
https://hdl.handle.net/21.15107/rcub_technorep_6406 .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Zabukovec-Logar, Nataša
AU  - Stojaković, Đorđe R.
AU  - Sajić, Sanja
AU  - Golobič, Amalija
AU  - Kaučič, Venčeslav
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/777
AB  - A novel layered zincophosphate (ZnPO–MPA) was prepared by hydrothermal crystallization using 3-methylaminopropylamine (MPA) as a structure-directing agent. The structure consists of macroanion [Zn2P3O8(OH)3]2- layers which are built up of 4-membered ring channels. The channels (of about 3.7 Å diameter) arise through the connection of the neighbouring rings by two oxygen bridges. The negative charge of the layers is compensated by diprotonated MPA molecules which are stacked parallel to the ring channels. ZnPO–MPA is stable up to 300 °C. At higher temperatures MPA decomposition begins followed by a dehydration, which occurs through condensation of the framework hydroxyl groups. The activation energy of the MPA decomposition is high due to the fact that the layers and MPA cations are held together by strong hydrogen bonds.
AB  - Jedan novi slojeviti cinkofosfat (ZnPO–MPA) dobijen je hidrotermalnom kristalizacijom korišćenjem 3-metilaminopropilamina (MPA) kao agensa za usmeravanje strukture. Struktura se sastoji od makroanjonskih slojeva [Zn2P3O8(OH)3]2- koji su izgrađeni od kanala u vidu četvoročlanog prstena. Kanali (prečnika oko 3,7 Å) nastaju povezivanjem susednih prstenova preko kiseoničnih mostova. Negativno naelektrisanje slojeva kompenzovano je dvoprotonovanim MPA koji su naslagani paralelno prstenastim kanalima. ZnPO–MPA je stabilan do 300 °C. Na višim temperaturama počinje razlaganje MPA koje je praćeno dehidratacijom, a ova se dešava putem kondenzacije hidroksilnih grupa rešetke. Energija aktivacije razlaganja MPA je velika zbog toga što se slojevi i katjoni MPA uzajamno drže jakim vodoničnim vezama.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Hydrothermal synthesis and structure of a new layered zincophosphate intercalated with 3-methylaminopropylamine cations
T1  - Hidrotermalna sinteza i struktura jednog novog slojevitog cinkofosfata interkaliranog sa 3-metilaminopropilamin-katjonom
EP  - 634
IS  - 4
SP  - 625
VL  - 70
UR  - https://hdl.handle.net/21.15107/rcub_technorep_777
ER  - 

@article{
author = "Rajić, Nevenka and Zabukovec-Logar, Nataša and Stojaković, Đorđe R. and Sajić, Sanja and Golobič, Amalija and Kaučič, Venčeslav",
year = "2005",
abstract = "A novel layered zincophosphate (ZnPO–MPA) was prepared by hydrothermal crystallization using 3-methylaminopropylamine (MPA) as a structure-directing agent. The structure consists of macroanion [Zn2P3O8(OH)3]2- layers which are built up of 4-membered ring channels. The channels (of about 3.7 Å diameter) arise through the connection of the neighbouring rings by two oxygen bridges. The negative charge of the layers is compensated by diprotonated MPA molecules which are stacked parallel to the ring channels. ZnPO–MPA is stable up to 300 °C. At higher temperatures MPA decomposition begins followed by a dehydration, which occurs through condensation of the framework hydroxyl groups. The activation energy of the MPA decomposition is high due to the fact that the layers and MPA cations are held together by strong hydrogen bonds., Jedan novi slojeviti cinkofosfat (ZnPO–MPA) dobijen je hidrotermalnom kristalizacijom korišćenjem 3-metilaminopropilamina (MPA) kao agensa za usmeravanje strukture. Struktura se sastoji od makroanjonskih slojeva [Zn2P3O8(OH)3]2- koji su izgrađeni od kanala u vidu četvoročlanog prstena. Kanali (prečnika oko 3,7 Å) nastaju povezivanjem susednih prstenova preko kiseoničnih mostova. Negativno naelektrisanje slojeva kompenzovano je dvoprotonovanim MPA koji su naslagani paralelno prstenastim kanalima. ZnPO–MPA je stabilan do 300 °C. Na višim temperaturama počinje razlaganje MPA koje je praćeno dehidratacijom, a ova se dešava putem kondenzacije hidroksilnih grupa rešetke. Energija aktivacije razlaganja MPA je velika zbog toga što se slojevi i katjoni MPA uzajamno drže jakim vodoničnim vezama.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Hydrothermal synthesis and structure of a new layered zincophosphate intercalated with 3-methylaminopropylamine cations, Hidrotermalna sinteza i struktura jednog novog slojevitog cinkofosfata interkaliranog sa 3-metilaminopropilamin-katjonom",
pages = "634-625",
number = "4",
volume = "70",
url = "https://hdl.handle.net/21.15107/rcub_technorep_777"
}

Rajić, N., Zabukovec-Logar, N., Stojaković, Đ. R., Sajić, S., Golobič, A.,& Kaučič, V.. (2005). Hydrothermal synthesis and structure of a new layered zincophosphate intercalated with 3-methylaminopropylamine cations. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 70(4), 625-634.
https://hdl.handle.net/21.15107/rcub_technorep_777

Rajić N, Zabukovec-Logar N, Stojaković ĐR, Sajić S, Golobič A, Kaučič V. Hydrothermal synthesis and structure of a new layered zincophosphate intercalated with 3-methylaminopropylamine cations. in Journal of the Serbian Chemical Society. 2005;70(4):625-634.
https://hdl.handle.net/21.15107/rcub_technorep_777 .

Rajić, Nevenka, Zabukovec-Logar, Nataša, Stojaković, Đorđe R., Sajić, Sanja, Golobič, Amalija, Kaučič, Venčeslav, "Hydrothermal synthesis and structure of a new layered zincophosphate intercalated with 3-methylaminopropylamine cations" in Journal of the Serbian Chemical Society, 70, no. 4 (2005):625-634,
https://hdl.handle.net/21.15107/rcub_technorep_777 .