TY  - JOUR
AU  - Jovanović, Mina
AU  - Arcon, Iztok
AU  - Kovač, Janez
AU  - Novak-Tusar, Nataša
AU  - Obradović, Bojana
AU  - Rajić, Nevenka
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3440
AB  - In this study the uptake capacity of Mn(II) ions by zeolite A beads was investigated for different initial Mn concentration (100-400 mg Mn dm(-3)) in batch mode at 25-55 degrees C. The obtained adsorption capacity varying from 30 to 50 mg Mn g(-1) demonstrated a high affinity of zeolite A towards Mn(II) present in solutions. Kinetic studies indicated the intra-particle diffusion as the rate limiting step up to 45 degrees C with apparent diffusivities in the range (1.2-2.0) x 10(-13) m(2) s(-1) and the activation energy of 21.9 kJ mol(-1), which implies strong interactions between the zeolite A and Mn ions. At 55 degrees C ion-exchange became the rate limiting step. The adsorption isotherms were studied at 25 degrees C showing that the Mn adsorption is the best described by the Langmuir model suggesting a homogenous zeolite surface. XPS analysis of the Mn-loaded beads showed that there is no surface accumulation of Mn but an almost uniform Mn distribution inside zeolite A, whereas XANES and EXAFS suggested that the adsorption of Mn(II) was followed by the Mn(II) oxidation and oxide formation. Regeneration of the spent zeolite was examined in 8 adsorption/desorption cycles by a chelating Na(2)EDTA in a fluidized column. It has been found that zeolite A beads could be reused for at least 4 cycles with satisfactory Mn(II) adsorption efficiencies of about 70%.
PB  - Elsevier Science Bv, Amsterdam
T2  - Microporous and Mesoporous Materials
T1  - Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent
EP  - 385
SP  - 378
VL  - 226
DO  - 10.1016/j.micromeso.2016.02.026
ER  - 

@article{
author = "Jovanović, Mina and Arcon, Iztok and Kovač, Janez and Novak-Tusar, Nataša and Obradović, Bojana and Rajić, Nevenka",
year = "2016",
abstract = "In this study the uptake capacity of Mn(II) ions by zeolite A beads was investigated for different initial Mn concentration (100-400 mg Mn dm(-3)) in batch mode at 25-55 degrees C. The obtained adsorption capacity varying from 30 to 50 mg Mn g(-1) demonstrated a high affinity of zeolite A towards Mn(II) present in solutions. Kinetic studies indicated the intra-particle diffusion as the rate limiting step up to 45 degrees C with apparent diffusivities in the range (1.2-2.0) x 10(-13) m(2) s(-1) and the activation energy of 21.9 kJ mol(-1), which implies strong interactions between the zeolite A and Mn ions. At 55 degrees C ion-exchange became the rate limiting step. The adsorption isotherms were studied at 25 degrees C showing that the Mn adsorption is the best described by the Langmuir model suggesting a homogenous zeolite surface. XPS analysis of the Mn-loaded beads showed that there is no surface accumulation of Mn but an almost uniform Mn distribution inside zeolite A, whereas XANES and EXAFS suggested that the adsorption of Mn(II) was followed by the Mn(II) oxidation and oxide formation. Regeneration of the spent zeolite was examined in 8 adsorption/desorption cycles by a chelating Na(2)EDTA in a fluidized column. It has been found that zeolite A beads could be reused for at least 4 cycles with satisfactory Mn(II) adsorption efficiencies of about 70%.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Microporous and Mesoporous Materials",
title = "Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent",
pages = "385-378",
volume = "226",
doi = "10.1016/j.micromeso.2016.02.026"
}

Jovanović, M., Arcon, I., Kovač, J., Novak-Tusar, N., Obradović, B.,& Rajić, N.. (2016). Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent. in Microporous and Mesoporous Materials
Elsevier Science Bv, Amsterdam., 226, 378-385.
https://doi.org/10.1016/j.micromeso.2016.02.026

Jovanović M, Arcon I, Kovač J, Novak-Tusar N, Obradović B, Rajić N. Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent. in Microporous and Mesoporous Materials. 2016;226:378-385.
doi:10.1016/j.micromeso.2016.02.026 .

Jovanović, Mina, Arcon, Iztok, Kovač, Janez, Novak-Tusar, Nataša, Obradović, Bojana, Rajić, Nevenka, "Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent" in Microporous and Mesoporous Materials, 226 (2016):378-385,
https://doi.org/10.1016/j.micromeso.2016.02.026 . .

TY  - JOUR
AU  - Jevtić, Sanja
AU  - Arcon, Iztok
AU  - Recnik, Aleksander
AU  - Babić, Biljana M.
AU  - Mazaj, Matjaz
AU  - Pavlović, Jelena
AU  - Matijasević, Danka
AU  - Nikšić, Miomir
AU  - Rajić, Nevenka
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2662
AB  - Se(IV) and Se(VI) anions are the dominant species of Se existing in aqueous systems. In this study, the iron(III)-modified natural zeolitic tuff (Fe-CLI) from the Serbian deposit Zlatokop has been investigated as an adsorbent for the Se oxyanions. Fe-CLI shows adsorption activity for both Se(IV) and Se(VI) which decreases with increasing pH. The adsorption capacity of Fe-CLI is found to be higher for Se(IV) than for Se(VI). Kinetics data follow the pseudo-second-order model and the obtained parameters k indicate that the rates of adsorption and desorption are higher for Se(VI). Extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) analyses reveal that Se is bound at the zeolite surface forming not only the Se-O-Fe but also Se-O-Si bonds. The adsorption mechanism depends of the type of oxo ions. Samples of zeolitic tuff which contain Se were tested as soil supplements for the cultivation of Pleurotus ostreatus mushrooms. The fungus adsorbed the inorganic Se from zeolitic tuff transforming it to a more valuable organically bound form.
PB  - Elsevier, Amsterdam
T2  - Microporous and Mesoporous Materials
T1  - The iron(III)-modified natural zeolitic tuff as an adsorbent and carrier for selenium oxyanions
EP  - 100
SP  - 92
VL  - 197
DO  - 10.1016/j.micromeso.2014.06.008
ER  - 

@article{
author = "Jevtić, Sanja and Arcon, Iztok and Recnik, Aleksander and Babić, Biljana M. and Mazaj, Matjaz and Pavlović, Jelena and Matijasević, Danka and Nikšić, Miomir and Rajić, Nevenka",
year = "2014",
abstract = "Se(IV) and Se(VI) anions are the dominant species of Se existing in aqueous systems. In this study, the iron(III)-modified natural zeolitic tuff (Fe-CLI) from the Serbian deposit Zlatokop has been investigated as an adsorbent for the Se oxyanions. Fe-CLI shows adsorption activity for both Se(IV) and Se(VI) which decreases with increasing pH. The adsorption capacity of Fe-CLI is found to be higher for Se(IV) than for Se(VI). Kinetics data follow the pseudo-second-order model and the obtained parameters k indicate that the rates of adsorption and desorption are higher for Se(VI). Extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) analyses reveal that Se is bound at the zeolite surface forming not only the Se-O-Fe but also Se-O-Si bonds. The adsorption mechanism depends of the type of oxo ions. Samples of zeolitic tuff which contain Se were tested as soil supplements for the cultivation of Pleurotus ostreatus mushrooms. The fungus adsorbed the inorganic Se from zeolitic tuff transforming it to a more valuable organically bound form.",
publisher = "Elsevier, Amsterdam",
journal = "Microporous and Mesoporous Materials",
title = "The iron(III)-modified natural zeolitic tuff as an adsorbent and carrier for selenium oxyanions",
pages = "100-92",
volume = "197",
doi = "10.1016/j.micromeso.2014.06.008"
}

Jevtić, S., Arcon, I., Recnik, A., Babić, B. M., Mazaj, M., Pavlović, J., Matijasević, D., Nikšić, M.,& Rajić, N.. (2014). The iron(III)-modified natural zeolitic tuff as an adsorbent and carrier for selenium oxyanions. in Microporous and Mesoporous Materials
Elsevier, Amsterdam., 197, 92-100.
https://doi.org/10.1016/j.micromeso.2014.06.008

Jevtić S, Arcon I, Recnik A, Babić BM, Mazaj M, Pavlović J, Matijasević D, Nikšić M, Rajić N. The iron(III)-modified natural zeolitic tuff as an adsorbent and carrier for selenium oxyanions. in Microporous and Mesoporous Materials. 2014;197:92-100.
doi:10.1016/j.micromeso.2014.06.008 .

Jevtić, Sanja, Arcon, Iztok, Recnik, Aleksander, Babić, Biljana M., Mazaj, Matjaz, Pavlović, Jelena, Matijasević, Danka, Nikšić, Miomir, Rajić, Nevenka, "The iron(III)-modified natural zeolitic tuff as an adsorbent and carrier for selenium oxyanions" in Microporous and Mesoporous Materials, 197 (2014):92-100,
https://doi.org/10.1016/j.micromeso.2014.06.008 . .

TY  - JOUR
AU  - Tusar, NN
AU  - Zabukovec-Logar, Nataša
AU  - Arcon, Iztok
AU  - Thibault-Starzyk, Frederic
AU  - Ristić, A
AU  - Rajić, Nevenka
AU  - Kaučič, Venčeslav
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/513
AB  - Manganese-containing silicalite-1 (MnS-1) was synthesized hydrothermally in the presence of the structure-directing agent (template) tetraethylammonium hydroxide (TEAOH) for the first time. The highly crystalline MnS-1 crystallized from a gel with a molar composition of 2:1:1:50:25:935 Na2O:K2O:MnO:SiO2:TEAOH:H2O at 175 degreesC after 3 days. The product was thermally stable up to 700 degreesC in air. The template-free MnS-1 was prepared by calcination at 550 degreesC in an oxygen flow. The incorporation of manganese into the framework sites of silicalite-1 was suggested by elemental, thermogravimetric, and cation exchange analyses. The X-ray absorption spectroscopic methods XANES and EXAFS confirmed the incorporation of Mn3+ into a silicalite-1 framework. FT-IR spectroscopic studies of CO adsorption at 100 K on the MnS-1 revealed the Lewis acidity of the sample and the presence of both Mn3+ and Mn2+ cations in the structure.
PB  - Amer Chemical Soc, Washington
T2  - Chemistry of Materials
T1  - Manganese-containing silica-based microporous molecular sieve MnS-1: Synthesis and characterization
EP  - 4750
IS  - 25
SP  - 4745
VL  - 15
DO  - 10.1021/cm031091c
ER  - 

@article{
author = "Tusar, NN and Zabukovec-Logar, Nataša and Arcon, Iztok and Thibault-Starzyk, Frederic and Ristić, A and Rajić, Nevenka and Kaučič, Venčeslav",
year = "2003",
abstract = "Manganese-containing silicalite-1 (MnS-1) was synthesized hydrothermally in the presence of the structure-directing agent (template) tetraethylammonium hydroxide (TEAOH) for the first time. The highly crystalline MnS-1 crystallized from a gel with a molar composition of 2:1:1:50:25:935 Na2O:K2O:MnO:SiO2:TEAOH:H2O at 175 degreesC after 3 days. The product was thermally stable up to 700 degreesC in air. The template-free MnS-1 was prepared by calcination at 550 degreesC in an oxygen flow. The incorporation of manganese into the framework sites of silicalite-1 was suggested by elemental, thermogravimetric, and cation exchange analyses. The X-ray absorption spectroscopic methods XANES and EXAFS confirmed the incorporation of Mn3+ into a silicalite-1 framework. FT-IR spectroscopic studies of CO adsorption at 100 K on the MnS-1 revealed the Lewis acidity of the sample and the presence of both Mn3+ and Mn2+ cations in the structure.",
publisher = "Amer Chemical Soc, Washington",
journal = "Chemistry of Materials",
title = "Manganese-containing silica-based microporous molecular sieve MnS-1: Synthesis and characterization",
pages = "4750-4745",
number = "25",
volume = "15",
doi = "10.1021/cm031091c"
}

Tusar, N., Zabukovec-Logar, N., Arcon, I., Thibault-Starzyk, F., Ristić, A., Rajić, N.,& Kaučič, V.. (2003). Manganese-containing silica-based microporous molecular sieve MnS-1: Synthesis and characterization. in Chemistry of Materials
Amer Chemical Soc, Washington., 15(25), 4745-4750.
https://doi.org/10.1021/cm031091c

Tusar N, Zabukovec-Logar N, Arcon I, Thibault-Starzyk F, Ristić A, Rajić N, Kaučič V. Manganese-containing silica-based microporous molecular sieve MnS-1: Synthesis and characterization. in Chemistry of Materials. 2003;15(25):4745-4750.
doi:10.1021/cm031091c .

Tusar, NN, Zabukovec-Logar, Nataša, Arcon, Iztok, Thibault-Starzyk, Frederic, Ristić, A, Rajić, Nevenka, Kaučič, Venčeslav, "Manganese-containing silica-based microporous molecular sieve MnS-1: Synthesis and characterization" in Chemistry of Materials, 15, no. 25 (2003):4745-4750,
https://doi.org/10.1021/cm031091c . .

TY  - JOUR
AU  - Arcon, Iztok
AU  - Rajić, Nevenka
AU  - Kodre, A
PY  - 1999
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/245
AB  - The incorporation of Mn(II) cations into a chabazite-like MnAlPO material is studied with Mn K-edge XANES and EXAFS. Both methods show that Mn(II) is inserted exclusively into the tetrahedrally coordinated aluminum sites. Calcination and rehydration of the as-synthesized MnAlPO cause a partial oxidation of Mn(II) as well as a change of its coordination geometry to a distorted octahedron.
PB  - Int Union Crystallography, Chester
T2  - Journal of Synchrotron Radiation
T1  - EXAFS and XANES study of the incorporation of Mn cations into a chabazite-like AlPO molecular sieve
EP  - 461
SP  - 460
VL  - 6
DO  - 10.1107/S0909049598015684
ER  - 

@article{
author = "Arcon, Iztok and Rajić, Nevenka and Kodre, A",
year = "1999",
abstract = "The incorporation of Mn(II) cations into a chabazite-like MnAlPO material is studied with Mn K-edge XANES and EXAFS. Both methods show that Mn(II) is inserted exclusively into the tetrahedrally coordinated aluminum sites. Calcination and rehydration of the as-synthesized MnAlPO cause a partial oxidation of Mn(II) as well as a change of its coordination geometry to a distorted octahedron.",
publisher = "Int Union Crystallography, Chester",
journal = "Journal of Synchrotron Radiation",
title = "EXAFS and XANES study of the incorporation of Mn cations into a chabazite-like AlPO molecular sieve",
pages = "461-460",
volume = "6",
doi = "10.1107/S0909049598015684"
}

Arcon, I., Rajić, N.,& Kodre, A.. (1999). EXAFS and XANES study of the incorporation of Mn cations into a chabazite-like AlPO molecular sieve. in Journal of Synchrotron Radiation
Int Union Crystallography, Chester., 6, 460-461.
https://doi.org/10.1107/S0909049598015684

Arcon I, Rajić N, Kodre A. EXAFS and XANES study of the incorporation of Mn cations into a chabazite-like AlPO molecular sieve. in Journal of Synchrotron Radiation. 1999;6:460-461.
doi:10.1107/S0909049598015684 .

Arcon, Iztok, Rajić, Nevenka, Kodre, A, "EXAFS and XANES study of the incorporation of Mn cations into a chabazite-like AlPO molecular sieve" in Journal of Synchrotron Radiation, 6 (1999):460-461,
https://doi.org/10.1107/S0909049598015684 . .