TY  - CONF
AU  - Marjanović, Vesna
AU  - Janković-Častvan, Ivona
AU  - Lazarević, Slavica
AU  - Radovanović, Željko
AU  - Janaćković, Đorđe
AU  - Petrović, Rada
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5920
AB  - Ciprofloxacin (CIP) as a broad-spectrum quinolone antibiotic is extensively used in daily life and can be detected in municipal and pharmaceutical wastewaters, as well as natural waters. In this study, natural mineral sepiolite (SEP), SEP modified with hexadecyltrimethylammonium-bromide (HDAB) and SEP composites with graphene oxide (GO) were used as adsorbents for the removal of CIP from aqueous solutions. The composites were prepared at a mass ratio SEP to GO of 2 : 1, using SEP and SEP modified by [3-(2-aminoethylamino)propyl]trimethoxy-silane (APT). Thermogravimetric analysis, X-ray diffraction and nitrogen adsorption-desorption were used to characterize the obtained adsorbents. The adsorption of CIP was investigated at the pH value close to pH of natural waters. The concentration of CIP in aqueous solution was determined by UV-Vis spectroscopy. GO showed the highest adsorption capacity (~ 150 mg/g). The capacity of SEP was about 60 mg/g, while the SEP modification with HDAB has led to a decrease in the adsorption capacity (~ 35 mg/g). The composite SEP/GO showed the higher adsorption capacity (~ 110 mg/g) than the composite SEP-APT/GO (~ 40 mg/g). The capacity of the composite SEP/GO was higher than of mixture of SEP and GO, which indicated a certain degree of GO exfoliation and intecalation of sepiolie particles, as it was shown by X-ray diffraction. Equilibrium data for all adsorbents, except for HDAB modified sepiolite, fitted well to the Langmuir isotherm model.
PB  - University of Novi Sad, Faculty of Technology Novi Sad
C3  - 2nd International Conference on Advanced Production and Processing, Book of abstracts
T1  - Ciprofloxacin removal using sepiolite-based adsorbents
SP  - 218
SP  - 218
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5920
ER  - 

@conference{
author = "Marjanović, Vesna and Janković-Častvan, Ivona and Lazarević, Slavica and Radovanović, Željko and Janaćković, Đorđe and Petrović, Rada",
year = "2022",
abstract = "Ciprofloxacin (CIP) as a broad-spectrum quinolone antibiotic is extensively used in daily life and can be detected in municipal and pharmaceutical wastewaters, as well as natural waters. In this study, natural mineral sepiolite (SEP), SEP modified with hexadecyltrimethylammonium-bromide (HDAB) and SEP composites with graphene oxide (GO) were used as adsorbents for the removal of CIP from aqueous solutions. The composites were prepared at a mass ratio SEP to GO of 2 : 1, using SEP and SEP modified by [3-(2-aminoethylamino)propyl]trimethoxy-silane (APT). Thermogravimetric analysis, X-ray diffraction and nitrogen adsorption-desorption were used to characterize the obtained adsorbents. The adsorption of CIP was investigated at the pH value close to pH of natural waters. The concentration of CIP in aqueous solution was determined by UV-Vis spectroscopy. GO showed the highest adsorption capacity (~ 150 mg/g). The capacity of SEP was about 60 mg/g, while the SEP modification with HDAB has led to a decrease in the adsorption capacity (~ 35 mg/g). The composite SEP/GO showed the higher adsorption capacity (~ 110 mg/g) than the composite SEP-APT/GO (~ 40 mg/g). The capacity of the composite SEP/GO was higher than of mixture of SEP and GO, which indicated a certain degree of GO exfoliation and intecalation of sepiolie particles, as it was shown by X-ray diffraction. Equilibrium data for all adsorbents, except for HDAB modified sepiolite, fitted well to the Langmuir isotherm model.",
publisher = "University of Novi Sad, Faculty of Technology Novi Sad",
journal = "2nd International Conference on Advanced Production and Processing, Book of abstracts",
title = "Ciprofloxacin removal using sepiolite-based adsorbents",
pages = "218-218",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5920"
}

Marjanović, V., Janković-Častvan, I., Lazarević, S., Radovanović, Ž., Janaćković, Đ.,& Petrović, R.. (2022). Ciprofloxacin removal using sepiolite-based adsorbents. in 2nd International Conference on Advanced Production and Processing, Book of abstracts
University of Novi Sad, Faculty of Technology Novi Sad., 218.
https://hdl.handle.net/21.15107/rcub_technorep_5920

Marjanović V, Janković-Častvan I, Lazarević S, Radovanović Ž, Janaćković Đ, Petrović R. Ciprofloxacin removal using sepiolite-based adsorbents. in 2nd International Conference on Advanced Production and Processing, Book of abstracts. 2022;:218.
https://hdl.handle.net/21.15107/rcub_technorep_5920 .

Marjanović, Vesna, Janković-Častvan, Ivona, Lazarević, Slavica, Radovanović, Željko, Janaćković, Đorđe, Petrović, Rada, "Ciprofloxacin removal using sepiolite-based adsorbents" in 2nd International Conference on Advanced Production and Processing, Book of abstracts (2022):218,
https://hdl.handle.net/21.15107/rcub_technorep_5920 .

TY  - JOUR
AU  - Marjanović, Vesna
AU  - Marković, Radmila
AU  - Steharnik, Mirjana
AU  - Dimitrijević, Silvana
AU  - Marinković, Aleksandar D.
AU  - Perić-Grujić, Aleksandra
AU  - Đolić, Maja
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5271
AB  - Highly porous lignin-based microspheres, modified by magnetite nanoparticles, were used for the first time for the removal of selenate anions, Se(VI), from spiked and real water samples. The influence of experimental conditions: selenate concentration, adsorbent dosage and contact time on the adsorption capacity was investigated in a batch experimental mode. The FTIR, XRD, SEM techniques were used to analyze the structural and morphological properties of the native and exhausted adsorbent. The maximum adsorption capacity was found to be 69.9 mg/g for Se(VI) anions at pH 6.46 from the simulated water samples. The modified natural polymer was efficient in Se(VI) removal from the real (potable) water samples, originated from six cities in the Republic of Serbia, with an overage efficacy of 20%. The regeneration capacity of 61% in one cycle of desorption (0.5 M NaOH as desorption solution) of bio-based adsorbent was gained in this investigation. The examined material demonstrated a significant affinity for Se(VI) oxyanion, but a low potential for multi-cycle material application; consequently, the loaded sorbent could be proposed to be used as a Se fertilizer.
PB  - MDPI
T2  - International Journal of Molecular Sciences
T1  - Lignin Microspheres Modified with Magnetite Nanoparticles as a Selenate Highly Porous Adsorbent
IS  - 22
SP  - 13872
VL  - 23
DO  - 10.3390/ijms232213872
ER  - 

@article{
author = "Marjanović, Vesna and Marković, Radmila and Steharnik, Mirjana and Dimitrijević, Silvana and Marinković, Aleksandar D. and Perić-Grujić, Aleksandra and Đolić, Maja",
year = "2022",
abstract = "Highly porous lignin-based microspheres, modified by magnetite nanoparticles, were used for the first time for the removal of selenate anions, Se(VI), from spiked and real water samples. The influence of experimental conditions: selenate concentration, adsorbent dosage and contact time on the adsorption capacity was investigated in a batch experimental mode. The FTIR, XRD, SEM techniques were used to analyze the structural and morphological properties of the native and exhausted adsorbent. The maximum adsorption capacity was found to be 69.9 mg/g for Se(VI) anions at pH 6.46 from the simulated water samples. The modified natural polymer was efficient in Se(VI) removal from the real (potable) water samples, originated from six cities in the Republic of Serbia, with an overage efficacy of 20%. The regeneration capacity of 61% in one cycle of desorption (0.5 M NaOH as desorption solution) of bio-based adsorbent was gained in this investigation. The examined material demonstrated a significant affinity for Se(VI) oxyanion, but a low potential for multi-cycle material application; consequently, the loaded sorbent could be proposed to be used as a Se fertilizer.",
publisher = "MDPI",
journal = "International Journal of Molecular Sciences",
title = "Lignin Microspheres Modified with Magnetite Nanoparticles as a Selenate Highly Porous Adsorbent",
number = "22",
pages = "13872",
volume = "23",
doi = "10.3390/ijms232213872"
}

Marjanović, V., Marković, R., Steharnik, M., Dimitrijević, S., Marinković, A. D., Perić-Grujić, A.,& Đolić, M.. (2022). Lignin Microspheres Modified with Magnetite Nanoparticles as a Selenate Highly Porous Adsorbent. in International Journal of Molecular Sciences
MDPI., 23(22), 13872.
https://doi.org/10.3390/ijms232213872

Marjanović V, Marković R, Steharnik M, Dimitrijević S, Marinković AD, Perić-Grujić A, Đolić M. Lignin Microspheres Modified with Magnetite Nanoparticles as a Selenate Highly Porous Adsorbent. in International Journal of Molecular Sciences. 2022;23(22):13872.
doi:10.3390/ijms232213872 .

Marjanović, Vesna, Marković, Radmila, Steharnik, Mirjana, Dimitrijević, Silvana, Marinković, Aleksandar D., Perić-Grujić, Aleksandra, Đolić, Maja, "Lignin Microspheres Modified with Magnetite Nanoparticles as a Selenate Highly Porous Adsorbent" in International Journal of Molecular Sciences, 23, no. 22 (2022):13872,
https://doi.org/10.3390/ijms232213872 . .

TY  - JOUR
AU  - Lazarević, Slavica
AU  - Marjanović, Vesna
AU  - Janković-Častvan, Ivona
AU  - Živković, Ljiljana
AU  - Janaćković, Đorđe
AU  - Petrović, Rada
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4052
AB  - Natural and acid-activated sepiolites, functionalized by covalent grafting of [ 3-(2-aminoethylamino)propyl]trimethoxy-silane were used as adsorbents for the removal of an anionic Reactive Orange 16 dye from aqueous solutions. The influence of initial pH ( pH(i)) on the adsorption was first investigated in comparison with the adsorption onto unmodified sepiolites; then the dye removal process by modified samples was subjected to kinetic and equilibrium studies at pH(i) = 2.0 or 5.0, at different temperatures. Results showed that the adsorption of dye was favorable at lower pH(i) and at higher temperatures, in terms of adsorption capacity and rate of adsorption. The binding sites on the adsorbents surfaces were considered to be protonated amine groups, which play a role in the electrostatic interactions with the dye anions at pH(i) = 2.0. Formation of hydrogen bonds between hydrogen from amine groups and oxygen from the dye and van der Waals forces were proposed as the mechanisms of adsorption at pH(i) = 5.0. The adsorption kinetics was well fitted to the pseudo-second-order kinetic model, while the equilibrium adsorption data were well correlated with the Sips isotherm. The adsorption capacity of both modified sepiolites was much higher than of the parent samples, whereas the capacity of the functionalized acid-activated sepiolite was higher (similar to 172 mg/g) than of the functionalized natural sepiolite (similar to 158 mg/g) at 298 K, pH(i) 5.0.
PB  - Desalination Publ, Hopkinton
T2  - Desalination and Water Treatment
T1  - Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites
EP  - 384
SP  - 376
VL  - 163
DO  - 10.5004/dwt.2019.24437
ER  - 

@article{
author = "Lazarević, Slavica and Marjanović, Vesna and Janković-Častvan, Ivona and Živković, Ljiljana and Janaćković, Đorđe and Petrović, Rada",
year = "2019",
abstract = "Natural and acid-activated sepiolites, functionalized by covalent grafting of [ 3-(2-aminoethylamino)propyl]trimethoxy-silane were used as adsorbents for the removal of an anionic Reactive Orange 16 dye from aqueous solutions. The influence of initial pH ( pH(i)) on the adsorption was first investigated in comparison with the adsorption onto unmodified sepiolites; then the dye removal process by modified samples was subjected to kinetic and equilibrium studies at pH(i) = 2.0 or 5.0, at different temperatures. Results showed that the adsorption of dye was favorable at lower pH(i) and at higher temperatures, in terms of adsorption capacity and rate of adsorption. The binding sites on the adsorbents surfaces were considered to be protonated amine groups, which play a role in the electrostatic interactions with the dye anions at pH(i) = 2.0. Formation of hydrogen bonds between hydrogen from amine groups and oxygen from the dye and van der Waals forces were proposed as the mechanisms of adsorption at pH(i) = 5.0. The adsorption kinetics was well fitted to the pseudo-second-order kinetic model, while the equilibrium adsorption data were well correlated with the Sips isotherm. The adsorption capacity of both modified sepiolites was much higher than of the parent samples, whereas the capacity of the functionalized acid-activated sepiolite was higher (similar to 172 mg/g) than of the functionalized natural sepiolite (similar to 158 mg/g) at 298 K, pH(i) 5.0.",
publisher = "Desalination Publ, Hopkinton",
journal = "Desalination and Water Treatment",
title = "Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites",
pages = "384-376",
volume = "163",
doi = "10.5004/dwt.2019.24437"
}

Lazarević, S., Marjanović, V., Janković-Častvan, I., Živković, L., Janaćković, Đ.,& Petrović, R.. (2019). Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites. in Desalination and Water Treatment
Desalination Publ, Hopkinton., 163, 376-384.
https://doi.org/10.5004/dwt.2019.24437

Lazarević S, Marjanović V, Janković-Častvan I, Živković L, Janaćković Đ, Petrović R. Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites. in Desalination and Water Treatment. 2019;163:376-384.
doi:10.5004/dwt.2019.24437 .

Lazarević, Slavica, Marjanović, Vesna, Janković-Častvan, Ivona, Živković, Ljiljana, Janaćković, Đorđe, Petrović, Rada, "Effective removal of Reactive Orange 16 dye from aqueous solution by amine-functionalized sepiolites" in Desalination and Water Treatment, 163 (2019):376-384,
https://doi.org/10.5004/dwt.2019.24437 . .

TY  - JOUR
AU  - Marjanović, Vesna M.
AU  - Lazarević, Slavica
AU  - Janković-Častvan, Ivona
AU  - Jokić, Bojan
AU  - Bjelajac, Anđelika
AU  - Janaćković, Đorđe
AU  - Petrović, Rada
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2313
AB  - Chromium(VI) adsorption from aqueous solutions onto thermo-acid activated sepiolite functionalized with (3-mercaptopropyl)trimethoxy-silane and [3-(2-aminoethylamino)propyl]trimethoxy-silane was investigated. Scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric and differential thermal analysis, nitrogen adsorption-desorption, and determination of the point of zero charge were used to characterize the obtained adsorbents. It has been established that the silanes were successfully grafted on the thermo-acid activated sepiolite surfaces and that the structure of parent material was preserved during the functionalization. The adsorption of Cr(VI) onto functionalized thermo-acid activated sepiolite was tested as a function of initial pH values at 298 K. The amine functionalized thermo-acid activated sepiolite showed a higher adsorption capacity than the mercapto functionalized thermo-acid activated sepiolite at all studied initial pH values, especially at the initial pH 2.
AB  - Predmet ovog rada je funkcionalizacija termo-kiselinski aktiviranog sepiolita primenom (3-merkaptopropil)trimetoksisilana ili merkapto-silana i [3-(2-aminoetil-amino) propil]trimetoksisilana ili amino-silana, određivanje fizičko-hemijskih svojstava i proučavanje adsorpcije Cr(VI) iz vodenih rastvora na funkcionalizovanim materijalima pri različitim početnim pH vrednostima (2,0, 3,0 i 4,5). Za karakterizaciju funkcionalizovanih adsorbenata korišćene su: rendgenska difrakciona analiza (XRD), infracrvena spektroskopska analiza (FT-IR), termogravimetrijska i diferencijalno-termijska analiza (TG/DTA), skenirajuća elektronska mikroskopija (SEM), dok su adsorpciono-desorpcione izoterme azota korišćene za određivanje specifične površine, zapremine i raspodele veličina pora. Tačka nultog naelektrisanja adsorbenata je određena metodom uravnotežavanja posebnih proba. Rezultati karakterizacije su pokazali da je bolja funkcionalizacija termo-kiselinski aktiviranog sepiolita postignuta primenom amino-silana. Tokom funkcionalizacije organosilanima sačuvana je struktura i vlaknasta morfologija termo-kiselinski aktiviranog sepiolita. Kovalentnim vezivanjem amino-silana za površinu termo-kiselinski aktiviranog sepiolita povećava se bazni karakter površine, dok se u slučaju vezivanja merkapto-silana kiselo-bazna svojstva ne menjaju značajno. Specifična površina, zapremina i prečnici pora amino-silaniziranog uzorka su značajno manji u odnosu na nefunkcionalizovan uzorak, dok su kod merkapto-silaniziranog sepiolita približno isti kao kod polaznog materijala. Kapacitet adsorpcije Cr(VI) amino-silaniziranog adsorbenta je veći od kapaciteta merkapto-silaniziranog uzorka na svim ispitivanim početnim pH vrednostima Cr(VI) rastvora i naročito pri veoma niskoj početnoj pH vrednosti (2,0). Dominantan mehanizam adsorpcije Cr(VI) pri početnoj pH rastvora 2,0 na amino-silaniziranom adsorbentu je elektrostatičko privlačenje između Cr(VI) anjona i protonovanih amino grupa, a pri višim početnim pH rastvora moguće je obrazovanje vodoničnih veza između CrO42- i amino grupa. Adsorpcija Cr(VI) na merkapto-silaniziranom adsorbentu se zasniva na elektrostatičkim interakcijama između Cr(VI) anjona i protonovanih merkapto grupa, kao i redukciji Cr(VI) do Cr3+ merkapto grupama, uz elektro-statičko privlačenje redukcijom nastalih Cr3+ i sulfonatnih grupa dobijenih oksidacijom merkapto grupa.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Functionalization of thermo-acid activated sepiolite by amine-silane and mercapto-silane for chromium(VI) adsorption from aqueous solutions
T1  - Adsorpcija hroma(VI) iz vodenih rastvora na termo-kiselinski aktiviranom sepiolitu funkcionalizovanom amino-silanom i merkapto-silanom
EP  - 728
IS  - 5
SP  - 715
VL  - 67
DO  - 10.2298/HEMIND121026117M
ER  - 

@article{
author = "Marjanović, Vesna M. and Lazarević, Slavica and Janković-Častvan, Ivona and Jokić, Bojan and Bjelajac, Anđelika and Janaćković, Đorđe and Petrović, Rada",
year = "2013",
abstract = "Chromium(VI) adsorption from aqueous solutions onto thermo-acid activated sepiolite functionalized with (3-mercaptopropyl)trimethoxy-silane and [3-(2-aminoethylamino)propyl]trimethoxy-silane was investigated. Scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric and differential thermal analysis, nitrogen adsorption-desorption, and determination of the point of zero charge were used to characterize the obtained adsorbents. It has been established that the silanes were successfully grafted on the thermo-acid activated sepiolite surfaces and that the structure of parent material was preserved during the functionalization. The adsorption of Cr(VI) onto functionalized thermo-acid activated sepiolite was tested as a function of initial pH values at 298 K. The amine functionalized thermo-acid activated sepiolite showed a higher adsorption capacity than the mercapto functionalized thermo-acid activated sepiolite at all studied initial pH values, especially at the initial pH 2., Predmet ovog rada je funkcionalizacija termo-kiselinski aktiviranog sepiolita primenom (3-merkaptopropil)trimetoksisilana ili merkapto-silana i [3-(2-aminoetil-amino) propil]trimetoksisilana ili amino-silana, određivanje fizičko-hemijskih svojstava i proučavanje adsorpcije Cr(VI) iz vodenih rastvora na funkcionalizovanim materijalima pri različitim početnim pH vrednostima (2,0, 3,0 i 4,5). Za karakterizaciju funkcionalizovanih adsorbenata korišćene su: rendgenska difrakciona analiza (XRD), infracrvena spektroskopska analiza (FT-IR), termogravimetrijska i diferencijalno-termijska analiza (TG/DTA), skenirajuća elektronska mikroskopija (SEM), dok su adsorpciono-desorpcione izoterme azota korišćene za određivanje specifične površine, zapremine i raspodele veličina pora. Tačka nultog naelektrisanja adsorbenata je određena metodom uravnotežavanja posebnih proba. Rezultati karakterizacije su pokazali da je bolja funkcionalizacija termo-kiselinski aktiviranog sepiolita postignuta primenom amino-silana. Tokom funkcionalizacije organosilanima sačuvana je struktura i vlaknasta morfologija termo-kiselinski aktiviranog sepiolita. Kovalentnim vezivanjem amino-silana za površinu termo-kiselinski aktiviranog sepiolita povećava se bazni karakter površine, dok se u slučaju vezivanja merkapto-silana kiselo-bazna svojstva ne menjaju značajno. Specifična površina, zapremina i prečnici pora amino-silaniziranog uzorka su značajno manji u odnosu na nefunkcionalizovan uzorak, dok su kod merkapto-silaniziranog sepiolita približno isti kao kod polaznog materijala. Kapacitet adsorpcije Cr(VI) amino-silaniziranog adsorbenta je veći od kapaciteta merkapto-silaniziranog uzorka na svim ispitivanim početnim pH vrednostima Cr(VI) rastvora i naročito pri veoma niskoj početnoj pH vrednosti (2,0). Dominantan mehanizam adsorpcije Cr(VI) pri početnoj pH rastvora 2,0 na amino-silaniziranom adsorbentu je elektrostatičko privlačenje između Cr(VI) anjona i protonovanih amino grupa, a pri višim početnim pH rastvora moguće je obrazovanje vodoničnih veza između CrO42- i amino grupa. Adsorpcija Cr(VI) na merkapto-silaniziranom adsorbentu se zasniva na elektrostatičkim interakcijama između Cr(VI) anjona i protonovanih merkapto grupa, kao i redukciji Cr(VI) do Cr3+ merkapto grupama, uz elektro-statičko privlačenje redukcijom nastalih Cr3+ i sulfonatnih grupa dobijenih oksidacijom merkapto grupa.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Functionalization of thermo-acid activated sepiolite by amine-silane and mercapto-silane for chromium(VI) adsorption from aqueous solutions, Adsorpcija hroma(VI) iz vodenih rastvora na termo-kiselinski aktiviranom sepiolitu funkcionalizovanom amino-silanom i merkapto-silanom",
pages = "728-715",
number = "5",
volume = "67",
doi = "10.2298/HEMIND121026117M"
}

Marjanović, V. M., Lazarević, S., Janković-Častvan, I., Jokić, B., Bjelajac, A., Janaćković, Đ.,& Petrović, R.. (2013). Functionalization of thermo-acid activated sepiolite by amine-silane and mercapto-silane for chromium(VI) adsorption from aqueous solutions. in Hemijska industrija
Association of Chemical Engineers of Serbia., 67(5), 715-728.
https://doi.org/10.2298/HEMIND121026117M

Marjanović VM, Lazarević S, Janković-Častvan I, Jokić B, Bjelajac A, Janaćković Đ, Petrović R. Functionalization of thermo-acid activated sepiolite by amine-silane and mercapto-silane for chromium(VI) adsorption from aqueous solutions. in Hemijska industrija. 2013;67(5):715-728.
doi:10.2298/HEMIND121026117M .

Marjanović, Vesna M., Lazarević, Slavica, Janković-Častvan, Ivona, Jokić, Bojan, Bjelajac, Anđelika, Janaćković, Đorđe, Petrović, Rada, "Functionalization of thermo-acid activated sepiolite by amine-silane and mercapto-silane for chromium(VI) adsorption from aqueous solutions" in Hemijska industrija, 67, no. 5 (2013):715-728,
https://doi.org/10.2298/HEMIND121026117M . .