TY  - JOUR
AU  - Ivanovic, Marija
AU  - Nenadovic, Snezana
AU  - Pavlovic, Vera P.
AU  - Radović, Ivona
AU  - Kijevčanin, Mirjana
AU  - Pavlović, Vladimir B.
AU  - Kljajevic, Ljiljana
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4869
AB  - Thermodynamic parameters (densities, viscosities, speed of sound, and refractive index) of four series of alkaline activators were determined over the temperature range from 15 to 60 degrees C for the process of geopolymerization. Mixtures of Na2SiO3 and NaOH of different molar concentrations ( from 2M to 8M with step 2) were used as an alkaline activator. The sample with the highest NaOH concentration also shows the highest values of all thermodynamic parameters. Metakaolin, obtained by calcination of kaolin at 750 degrees C, was used as the starting material. The samples were characterized by X-ray diffraction (XRD), FTIR and Raman spectroscopy, Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray (EDX) Spectroscopy. Results of FTIR analysis correlated with results of Raman Spectroscopy. Due to the polymerization process, the changes in the phonon spectrum were confirmed. The different concentrations of activators do not notably change the Si/Al ratio.
T2  - Macedonian Journal of Chemistry and Chemical Engineering
T1  - The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers
EP  - 117
IS  - 1
SP  - 107
VL  - 40
DO  - 10.20450/mjcce.2021.2127
ER  - 

@article{
author = "Ivanovic, Marija and Nenadovic, Snezana and Pavlovic, Vera P. and Radović, Ivona and Kijevčanin, Mirjana and Pavlović, Vladimir B. and Kljajevic, Ljiljana",
year = "2021",
abstract = "Thermodynamic parameters (densities, viscosities, speed of sound, and refractive index) of four series of alkaline activators were determined over the temperature range from 15 to 60 degrees C for the process of geopolymerization. Mixtures of Na2SiO3 and NaOH of different molar concentrations ( from 2M to 8M with step 2) were used as an alkaline activator. The sample with the highest NaOH concentration also shows the highest values of all thermodynamic parameters. Metakaolin, obtained by calcination of kaolin at 750 degrees C, was used as the starting material. The samples were characterized by X-ray diffraction (XRD), FTIR and Raman spectroscopy, Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray (EDX) Spectroscopy. Results of FTIR analysis correlated with results of Raman Spectroscopy. Due to the polymerization process, the changes in the phonon spectrum were confirmed. The different concentrations of activators do not notably change the Si/Al ratio.",
journal = "Macedonian Journal of Chemistry and Chemical Engineering",
title = "The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers",
pages = "117-107",
number = "1",
volume = "40",
doi = "10.20450/mjcce.2021.2127"
}

Ivanovic, M., Nenadovic, S., Pavlovic, V. P., Radović, I., Kijevčanin, M., Pavlović, V. B.,& Kljajevic, L.. (2021). The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers. in Macedonian Journal of Chemistry and Chemical Engineering, 40(1), 107-117.
https://doi.org/10.20450/mjcce.2021.2127

Ivanovic M, Nenadovic S, Pavlovic VP, Radović I, Kijevčanin M, Pavlović VB, Kljajevic L. The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers. in Macedonian Journal of Chemistry and Chemical Engineering. 2021;40(1):107-117.
doi:10.20450/mjcce.2021.2127 .

Ivanovic, Marija, Nenadovic, Snezana, Pavlovic, Vera P., Radović, Ivona, Kijevčanin, Mirjana, Pavlović, Vladimir B., Kljajevic, Ljiljana, "The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers" in Macedonian Journal of Chemistry and Chemical Engineering, 40, no. 1 (2021):107-117,
https://doi.org/10.20450/mjcce.2021.2127 . .

TY  - JOUR
AU  - Marjanovic, Vesna
AU  - Perić-Grujić, Aleksandra
AU  - Ristić, Mirjana
AU  - Marinković, Aleksandar
AU  - Markovic, Radmila
AU  - Onjia, Antonije
AU  - Sljivic-Ivanovic, Marija
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4737
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.
T2  - Metals
T1  - Selenate Adsorption from Water Using the Hydrous Iron Oxide-Impregnated Hybrid Polymer
IS  - 12
VL  - 10
DO  - 10.3390/met10121630
ER  - 

@article{
author = "Marjanovic, Vesna and Perić-Grujić, Aleksandra and Ristić, Mirjana and Marinković, Aleksandar and Markovic, Radmila and Onjia, Antonije and Sljivic-Ivanovic, Marija",
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.",
journal = "Metals",
title = "Selenate Adsorption from Water Using the Hydrous Iron Oxide-Impregnated Hybrid Polymer",
number = "12",
volume = "10",
doi = "10.3390/met10121630"
}

Marjanovic, V., Perić-Grujić, A., Ristić, M., Marinković, A., Markovic, R., Onjia, A.,& Sljivic-Ivanovic, M.. (2020). Selenate Adsorption from Water Using the Hydrous Iron Oxide-Impregnated Hybrid Polymer. in Metals, 10(12).
https://doi.org/10.3390/met10121630

Marjanovic V, Perić-Grujić A, Ristić M, Marinković A, Markovic R, Onjia A, Sljivic-Ivanovic M. Selenate Adsorption from Water Using the Hydrous Iron Oxide-Impregnated Hybrid Polymer. in Metals. 2020;10(12).
doi:10.3390/met10121630 .

Marjanovic, Vesna, Perić-Grujić, Aleksandra, Ristić, Mirjana, Marinković, Aleksandar, Markovic, Radmila, Onjia, Antonije, Sljivic-Ivanovic, Marija, "Selenate Adsorption from Water Using the Hydrous Iron Oxide-Impregnated Hybrid Polymer" in Metals, 10, no. 12 (2020),
https://doi.org/10.3390/met10121630 . .