TY  - JOUR
AU  - Marjanović, V.
AU  - Perić-Grujić, Aleksandra
AU  - Ristić, M.
AU  - Marinković, Aleksandar
AU  - Marković, R.
AU  - Onjia, Antonije
AU  - Šljivić-Ivanović, Marija Z.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4566
AB  - Hybrid adsorbent, based on the cross-linked copolymer impregnated with hydrous iron oxide, was applied for the first time for Se(VI) adsorption from water. The influence of the initial solution pH, selenate concentration and contact time to adsorption capacity was investigated. Adsorbent regeneration was explored using a full factorial experimental design in order to optimize the volume, initial pH value and concentration of the applied NaCl solution as a reagent. Equilibrium state was described using the Langmuir model, while kinetics fitted the pseudo-first order. The maximum adsorption capacity was found to be 28.8 mg/g. Desorption efficiency increased up to 70%, and became statistically significant with the reagent concentration and pH increase, while the applied solution volume was found to be insignificant in the investigated range. Based on the results obtained, pH influence to the adsorption capacity, desorption efficiency, Fourier transform infrared (FTIR) and X-ray diffraction (XRD) analysis of loaded adsorbent, it was concluded that the outer-and inner-sphere complexation are mechanisms responsible for Se(VI) separation from water. In addition to the experiments with synthetic solutions, the adsorbent performances in drinking water samples were explored, showing the purification efficiency up to 25%, depending on the initial Se(VI) concentration and water pH. Determined sorption capacity of the cross-linked copolymer impregnated with hydrous iron oxide and its ability for regeneration, candidate this material for further research, as a promising anionic species sorbent.
PB  - MDPI, Basel
T2  - Metals
T1  - Selenate adsorption from water using the hydrous iron oxide-impregnated hybrid polymer
EP  - 15
IS  - 12
SP  - 1
VL  - 10
DO  - 10.3390/met10121630
ER  - 

@article{
author = "Marjanović, V. and Perić-Grujić, Aleksandra and Ristić, M. and Marinković, Aleksandar and Marković, R. and Onjia, Antonije and Šljivić-Ivanović, Marija Z.",
year = "2020",
abstract = "Hybrid adsorbent, based on the cross-linked copolymer impregnated with hydrous iron oxide, was applied for the first time for Se(VI) adsorption from water. The influence of the initial solution pH, selenate concentration and contact time to adsorption capacity was investigated. Adsorbent regeneration was explored using a full factorial experimental design in order to optimize the volume, initial pH value and concentration of the applied NaCl solution as a reagent. Equilibrium state was described using the Langmuir model, while kinetics fitted the pseudo-first order. The maximum adsorption capacity was found to be 28.8 mg/g. Desorption efficiency increased up to 70%, and became statistically significant with the reagent concentration and pH increase, while the applied solution volume was found to be insignificant in the investigated range. Based on the results obtained, pH influence to the adsorption capacity, desorption efficiency, Fourier transform infrared (FTIR) and X-ray diffraction (XRD) analysis of loaded adsorbent, it was concluded that the outer-and inner-sphere complexation are mechanisms responsible for Se(VI) separation from water. In addition to the experiments with synthetic solutions, the adsorbent performances in drinking water samples were explored, showing the purification efficiency up to 25%, depending on the initial Se(VI) concentration and water pH. Determined sorption capacity of the cross-linked copolymer impregnated with hydrous iron oxide and its ability for regeneration, candidate this material for further research, as a promising anionic species sorbent.",
publisher = "MDPI, Basel",
journal = "Metals",
title = "Selenate adsorption from water using the hydrous iron oxide-impregnated hybrid polymer",
pages = "15-1",
number = "12",
volume = "10",
doi = "10.3390/met10121630"
}

Marjanović, V., Perić-Grujić, A., Ristić, M., Marinković, A., Marković, R., Onjia, A.,& Šljivić-Ivanović, M. Z.. (2020). Selenate adsorption from water using the hydrous iron oxide-impregnated hybrid polymer. in Metals
MDPI, Basel., 10(12), 1-15.
https://doi.org/10.3390/met10121630

Marjanović V, Perić-Grujić A, Ristić M, Marinković A, Marković R, Onjia A, Šljivić-Ivanović MZ. Selenate adsorption from water using the hydrous iron oxide-impregnated hybrid polymer. in Metals. 2020;10(12):1-15.
doi:10.3390/met10121630 .

Marjanović, V., Perić-Grujić, Aleksandra, Ristić, M., Marinković, Aleksandar, Marković, R., Onjia, Antonije, Šljivić-Ivanović, Marija Z., "Selenate adsorption from water using the hydrous iron oxide-impregnated hybrid polymer" in Metals, 10, no. 12 (2020):1-15,
https://doi.org/10.3390/met10121630 . .

TY  - JOUR
AU  - Marjanović, V.
AU  - Lazarević, Slavica
AU  - Janković-Častvan, Ivona
AU  - Jokić, Bojan
AU  - Janaćković, Đorđe
AU  - Petrović, Rada
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2450
AB  - Chromium(VI) adsorption onto amine-functionalized sepiolites from aqueous solution at 298 K was investigated. Natural and add-activated sepiolites were functionalized by covalent grafting [3-(2-aminoethylamino)propyl] trimethoxy-silane to the silanol groups onto the sepiolite surface. Functionalization was proved by differential thermal analysis and the point of zero charge, pH(pzc), determinations. The adsorption isotherms suggested that the adsorption capacity of the functionalized acid-activated sepiolite was higher than that of the functionalized natural sepiolite, for all investigated initial solution pH values. Adsorption efficiency of the functionalized sepiolites was improved by decreasing solution pH value. Due to the high value of pH(pzc) and large buffer capacity of adsorbents, a very low initial solution pH value was required to achieve high protonation of the surface amine groups and provide electrostatic attraction of Cr(VI) anionic species. The maximum chromium(VI) removal was achieved at an initial pH of 2.0; ca. 60 mg/g of functionalized acid-activated sepiolite and ca. 37 mg/g of functionalized natural sepiolite. Equilibrium data for both functionalized sepiolites at an initial solution pH value of 2.0 fitted well to the Freundlich model. The adsorption process followed pseudo-second-order kinetics. The values of the thermodynamic parameters indicate a spontaneous adsorption process of a prevalently physical nature.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Clay Science
T1  - Adsorption of chromium (VI) from aqueous solutions onto amine-functionalized natural and acid-activated sepiolites
EP  - 210
SP  - 202
VL  - 80-81
DO  - 10.1016/j.clay.2013.04.008
ER  - 

@article{
author = "Marjanović, V. and Lazarević, Slavica and Janković-Častvan, Ivona and Jokić, Bojan and Janaćković, Đorđe and Petrović, Rada",
year = "2013",
abstract = "Chromium(VI) adsorption onto amine-functionalized sepiolites from aqueous solution at 298 K was investigated. Natural and add-activated sepiolites were functionalized by covalent grafting [3-(2-aminoethylamino)propyl] trimethoxy-silane to the silanol groups onto the sepiolite surface. Functionalization was proved by differential thermal analysis and the point of zero charge, pH(pzc), determinations. The adsorption isotherms suggested that the adsorption capacity of the functionalized acid-activated sepiolite was higher than that of the functionalized natural sepiolite, for all investigated initial solution pH values. Adsorption efficiency of the functionalized sepiolites was improved by decreasing solution pH value. Due to the high value of pH(pzc) and large buffer capacity of adsorbents, a very low initial solution pH value was required to achieve high protonation of the surface amine groups and provide electrostatic attraction of Cr(VI) anionic species. The maximum chromium(VI) removal was achieved at an initial pH of 2.0; ca. 60 mg/g of functionalized acid-activated sepiolite and ca. 37 mg/g of functionalized natural sepiolite. Equilibrium data for both functionalized sepiolites at an initial solution pH value of 2.0 fitted well to the Freundlich model. The adsorption process followed pseudo-second-order kinetics. The values of the thermodynamic parameters indicate a spontaneous adsorption process of a prevalently physical nature.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Clay Science",
title = "Adsorption of chromium (VI) from aqueous solutions onto amine-functionalized natural and acid-activated sepiolites",
pages = "210-202",
volume = "80-81",
doi = "10.1016/j.clay.2013.04.008"
}

Marjanović, V., Lazarević, S., Janković-Častvan, I., Jokić, B., Janaćković, Đ.,& Petrović, R.. (2013). Adsorption of chromium (VI) from aqueous solutions onto amine-functionalized natural and acid-activated sepiolites. in Applied Clay Science
Elsevier Science Bv, Amsterdam., 80-81, 202-210.
https://doi.org/10.1016/j.clay.2013.04.008

Marjanović V, Lazarević S, Janković-Častvan I, Jokić B, Janaćković Đ, Petrović R. Adsorption of chromium (VI) from aqueous solutions onto amine-functionalized natural and acid-activated sepiolites. in Applied Clay Science. 2013;80-81:202-210.
doi:10.1016/j.clay.2013.04.008 .

Marjanović, V., Lazarević, Slavica, Janković-Častvan, Ivona, Jokić, Bojan, Janaćković, Đorđe, Petrović, Rada, "Adsorption of chromium (VI) from aqueous solutions onto amine-functionalized natural and acid-activated sepiolites" in Applied Clay Science, 80-81 (2013):202-210,
https://doi.org/10.1016/j.clay.2013.04.008 . .

TY  - JOUR
AU  - Marjanović, V.
AU  - Lazarević, Slavica
AU  - Janković-Častvan, Ivona
AU  - Potkonjak, Branislav
AU  - Janaćković, Đorđe
AU  - Petrović, Rada
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1916
AB  - Natural and acid-activated sepiolite samples were functionalized with (3-Mercaptopropyl)trimethoxysilane. By X-ray powder diffraction, Fourier transform infrared spectroscopy, and differential thermal analysis it was shown that functionalization of sepiolites by grafting silane reagents occurs mainly on the surface, whereby their crystalline structure remained unchanged. The efficiency of the adsorbents in Cr(VI) removal from aqueous solutions follows the order: functionalized acid-activated sepiolite  gt  functionalized natural sepiolite  gt  acid-activated sepiolite  gt  natural sepiolite. As the number of silanol groups on the sepiolite surface increased during the acid activation, the silane functionalization increased and this led to an increase in Cr(VI) adsorption. The adsorption capacity strongly depended on the pH of the solution from which the adsorption occurred. Maximum Cr(VI) removal was ca. 8.0 mg Cr(VI) per g of functionalized acid-activated sepiolite at initial pH 3, when the pH of solution reached 4.7, and ca. 2.7 mg Cr(VI) per g of functionalized natural sepiolite at initial pH 2, when the pH of the solution reached 2.5. Cr(VI) removal by the functionalized sepiolites was mainly attributed to electrostatic attraction between the protonated mercapto groups and the negatively charged Cr(VI) species. The sorption isotherms showed that Cr(VI) removal by both functionalized sepiolites for all initial investigated solution pH values is well described using the Dubinin-Radushkevich model. The thermodynamic data suggest spontaneity of the major physical adsorption process at 298 K.
PB  - Elsevier Science Sa, Lausanne
T2  - Chemical Engineering Journal
T1  - Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites
EP  - 206
IS  - 1
SP  - 198
VL  - 166
DO  - 10.1016/j.cej.2010.10.062
ER  - 

@article{
author = "Marjanović, V. and Lazarević, Slavica and Janković-Častvan, Ivona and Potkonjak, Branislav and Janaćković, Đorđe and Petrović, Rada",
year = "2011",
abstract = "Natural and acid-activated sepiolite samples were functionalized with (3-Mercaptopropyl)trimethoxysilane. By X-ray powder diffraction, Fourier transform infrared spectroscopy, and differential thermal analysis it was shown that functionalization of sepiolites by grafting silane reagents occurs mainly on the surface, whereby their crystalline structure remained unchanged. The efficiency of the adsorbents in Cr(VI) removal from aqueous solutions follows the order: functionalized acid-activated sepiolite  gt  functionalized natural sepiolite  gt  acid-activated sepiolite  gt  natural sepiolite. As the number of silanol groups on the sepiolite surface increased during the acid activation, the silane functionalization increased and this led to an increase in Cr(VI) adsorption. The adsorption capacity strongly depended on the pH of the solution from which the adsorption occurred. Maximum Cr(VI) removal was ca. 8.0 mg Cr(VI) per g of functionalized acid-activated sepiolite at initial pH 3, when the pH of solution reached 4.7, and ca. 2.7 mg Cr(VI) per g of functionalized natural sepiolite at initial pH 2, when the pH of the solution reached 2.5. Cr(VI) removal by the functionalized sepiolites was mainly attributed to electrostatic attraction between the protonated mercapto groups and the negatively charged Cr(VI) species. The sorption isotherms showed that Cr(VI) removal by both functionalized sepiolites for all initial investigated solution pH values is well described using the Dubinin-Radushkevich model. The thermodynamic data suggest spontaneity of the major physical adsorption process at 298 K.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Chemical Engineering Journal",
title = "Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites",
pages = "206-198",
number = "1",
volume = "166",
doi = "10.1016/j.cej.2010.10.062"
}

Marjanović, V., Lazarević, S., Janković-Častvan, I., Potkonjak, B., Janaćković, Đ.,& Petrović, R.. (2011). Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites. in Chemical Engineering Journal
Elsevier Science Sa, Lausanne., 166(1), 198-206.
https://doi.org/10.1016/j.cej.2010.10.062

Marjanović V, Lazarević S, Janković-Častvan I, Potkonjak B, Janaćković Đ, Petrović R. Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites. in Chemical Engineering Journal. 2011;166(1):198-206.
doi:10.1016/j.cej.2010.10.062 .

Marjanović, V., Lazarević, Slavica, Janković-Častvan, Ivona, Potkonjak, Branislav, Janaćković, Đorđe, Petrović, Rada, "Chromium (VI) removal from aqueous solutions using mercaptosilane functionalized sepiolites" in Chemical Engineering Journal, 166, no. 1 (2011):198-206,
https://doi.org/10.1016/j.cej.2010.10.062 . .

TY  - JOUR
AU  - Marjanović, V
AU  - Ninković, Rozalija
AU  - Miladinović, Jelena
AU  - Todorović, A
AU  - Pavićević, Vladimir
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/752
AB  - The osmotic coefficients of the mixed electrolyte solution {y Na2SO4 + (1 - y)ZnSO4} (aq) have been measured by the isopiestic method, at T = 298.5 K. The experimental results were treated by Scatchard's, Pitzer-Kim's and Clegg-Pitzer-Brimblecombe's methods for mixed-electrolyte solutions. By these methods, the activity coefficients for Na2SO4 and ZnSO4 were calculated and compared. The Scatchard interaction parameters are used for calculation of the excess Gibbs free energy as a function of ionic strength and ionic-strength fraction of Na2SO4. Also, the Zdanovskii's rule of linearity is tested.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Chemical Thermodynamics
T1  - Osmotic and activity coefficients of {yNa(2)So(4)+ (1-y)ZnSO4}(aq) T=298.15 K
EP  - 116
IS  - 2
SP  - 111
VL  - 37
DO  - 10.1016/j.jct.2004.07.032
ER  - 

@article{
author = "Marjanović, V and Ninković, Rozalija and Miladinović, Jelena and Todorović, A and Pavićević, Vladimir",
year = "2005",
abstract = "The osmotic coefficients of the mixed electrolyte solution {y Na2SO4 + (1 - y)ZnSO4} (aq) have been measured by the isopiestic method, at T = 298.5 K. The experimental results were treated by Scatchard's, Pitzer-Kim's and Clegg-Pitzer-Brimblecombe's methods for mixed-electrolyte solutions. By these methods, the activity coefficients for Na2SO4 and ZnSO4 were calculated and compared. The Scatchard interaction parameters are used for calculation of the excess Gibbs free energy as a function of ionic strength and ionic-strength fraction of Na2SO4. Also, the Zdanovskii's rule of linearity is tested.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Chemical Thermodynamics",
title = "Osmotic and activity coefficients of {yNa(2)So(4)+ (1-y)ZnSO4}(aq) T=298.15 K",
pages = "116-111",
number = "2",
volume = "37",
doi = "10.1016/j.jct.2004.07.032"
}

Marjanović, V., Ninković, R., Miladinović, J., Todorović, A.,& Pavićević, V.. (2005). Osmotic and activity coefficients of {yNa(2)So(4)+ (1-y)ZnSO4}(aq) T=298.15 K. in Journal of Chemical Thermodynamics
Academic Press Ltd- Elsevier Science Ltd, London., 37(2), 111-116.
https://doi.org/10.1016/j.jct.2004.07.032

Marjanović V, Ninković R, Miladinović J, Todorović A, Pavićević V. Osmotic and activity coefficients of {yNa(2)So(4)+ (1-y)ZnSO4}(aq) T=298.15 K. in Journal of Chemical Thermodynamics. 2005;37(2):111-116.
doi:10.1016/j.jct.2004.07.032 .

Marjanović, V, Ninković, Rozalija, Miladinović, Jelena, Todorović, A, Pavićević, Vladimir, "Osmotic and activity coefficients of {yNa(2)So(4)+ (1-y)ZnSO4}(aq) T=298.15 K" in Journal of Chemical Thermodynamics, 37, no. 2 (2005):111-116,
https://doi.org/10.1016/j.jct.2004.07.032 . .