TY  - JOUR
AU  - Ivanović, Marija
AU  - Nenadović, Snežana S.
AU  - Pavlović, Vera P.
AU  - Radović, Ivona
AU  - Kijevčanin, Mirjana
AU  - Pavlović, Vladimir B.
AU  - Kljajević, Ljiljana
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3566
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.
PB  - Soc Chemists Technologists Madeconia, Skopje
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 = "Ivanović, Marija and Nenadović, Snežana S. and Pavlović, Vera P. and Radović, Ivona and Kijevčanin, Mirjana and Pavlović, Vladimir B. and Kljajević, 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.",
publisher = "Soc Chemists Technologists Madeconia, Skopje",
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"
}

Ivanović, M., Nenadović, S. S., Pavlović, V. P., Radović, I., Kijevčanin, M., Pavlović, V. B.,& Kljajević, 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
Soc Chemists Technologists Madeconia, Skopje., 40(1), 107-117.
https://doi.org/10.20450/mjcce.2021.2127

Ivanović M, Nenadović SS, Pavlović VP, Radović I, Kijevčanin M, Pavlović VB, Kljajević 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 .

Ivanović, Marija, Nenadović, Snežana S., Pavlović, Vera P., Radović, Ivona, Kijevčanin, Mirjana, Pavlović, Vladimir B., Kljajević, 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  - CONF
AU  - Ivanović, Marija
AU  - Mladenović, Nataša N.
AU  - Gulicovski, Jelena J.
AU  - Pavlović, Vladimir B.
AU  - Pavlović, Vera P.
AU  - Kljajević, Ljiljana
AU  - Nenadović, Snežana S.
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6796
AB  - Considering geopolymers as inorganic polymers, they are actually amorphous network of interlinked silicate and aluminate groups, so they could be prospective ceramic precursors for materials with defined dimensions obtained by casting and firing, but not from powder processing. In this research, the starting material is metakaolin, which was obtained by calcining domes tic kaolinite clay. Initially, four series of alkaline activators of NaOH and sodium silicate have been used. Activators present the mixtures of Na2SiO3 and solutions of NaOH, of different molarities 2M, 4M, 6M and 8M. The prepared geopolymer slurries were cast into the designated near shape at room temperature and after that at 60 °C. In fact, the post-synthesis curing process (28 days) has an important role in the obtaining good characteristics of geopolymers. Densities, viscosities and refractive index of alkaline activators were determined over the temperature range 15-60 °C of process of geopolymerizations. Based on the obtained results of investigated parameters have been selected to predict the properties of materials. All geopolymer samples were characterized by XRD, FTIR, SEM/EDS analysis and Raman spectroscopy providing complementary and valuable information of the investigated materials. This route of ceramics production has advantages associated with producing an environmental friendly, energy saving, clean new technology of geopolymer materials.
PB  - Belgrade : Serbian Ceramic Society
C3  - Serbian Ceramic Society Conference - Advanced Ceramics and Application VII, 17-19 September 2018, Belgrade, Serbia, Program and the Book of Abstracts
T1  - Effect of Alkaline Activator Properties on Structure of Metakaolin-Based Geopolymer Samples
EP  - 74
SP  - 73
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6796
ER  - 

@conference{
author = "Ivanović, Marija and Mladenović, Nataša N. and Gulicovski, Jelena J. and Pavlović, Vladimir B. and Pavlović, Vera P. and Kljajević, Ljiljana and Nenadović, Snežana S.",
year = "2018",
abstract = "Considering geopolymers as inorganic polymers, they are actually amorphous network of interlinked silicate and aluminate groups, so they could be prospective ceramic precursors for materials with defined dimensions obtained by casting and firing, but not from powder processing. In this research, the starting material is metakaolin, which was obtained by calcining domes tic kaolinite clay. Initially, four series of alkaline activators of NaOH and sodium silicate have been used. Activators present the mixtures of Na2SiO3 and solutions of NaOH, of different molarities 2M, 4M, 6M and 8M. The prepared geopolymer slurries were cast into the designated near shape at room temperature and after that at 60 °C. In fact, the post-synthesis curing process (28 days) has an important role in the obtaining good characteristics of geopolymers. Densities, viscosities and refractive index of alkaline activators were determined over the temperature range 15-60 °C of process of geopolymerizations. Based on the obtained results of investigated parameters have been selected to predict the properties of materials. All geopolymer samples were characterized by XRD, FTIR, SEM/EDS analysis and Raman spectroscopy providing complementary and valuable information of the investigated materials. This route of ceramics production has advantages associated with producing an environmental friendly, energy saving, clean new technology of geopolymer materials.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Serbian Ceramic Society Conference - Advanced Ceramics and Application VII, 17-19 September 2018, Belgrade, Serbia, Program and the Book of Abstracts",
title = "Effect of Alkaline Activator Properties on Structure of Metakaolin-Based Geopolymer Samples",
pages = "74-73",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6796"
}

Ivanović, M., Mladenović, N. N., Gulicovski, J. J., Pavlović, V. B., Pavlović, V. P., Kljajević, L.,& Nenadović, S. S.. (2018). Effect of Alkaline Activator Properties on Structure of Metakaolin-Based Geopolymer Samples. in Serbian Ceramic Society Conference - Advanced Ceramics and Application VII, 17-19 September 2018, Belgrade, Serbia, Program and the Book of Abstracts
Belgrade : Serbian Ceramic Society., 73-74.
https://hdl.handle.net/21.15107/rcub_machinery_6796

Ivanović M, Mladenović NN, Gulicovski JJ, Pavlović VB, Pavlović VP, Kljajević L, Nenadović SS. Effect of Alkaline Activator Properties on Structure of Metakaolin-Based Geopolymer Samples. in Serbian Ceramic Society Conference - Advanced Ceramics and Application VII, 17-19 September 2018, Belgrade, Serbia, Program and the Book of Abstracts. 2018;:73-74.
https://hdl.handle.net/21.15107/rcub_machinery_6796 .

Ivanović, Marija, Mladenović, Nataša N., Gulicovski, Jelena J., Pavlović, Vladimir B., Pavlović, Vera P., Kljajević, Ljiljana, Nenadović, Snežana S., "Effect of Alkaline Activator Properties on Structure of Metakaolin-Based Geopolymer Samples" in Serbian Ceramic Society Conference - Advanced Ceramics and Application VII, 17-19 September 2018, Belgrade, Serbia, Program and the Book of Abstracts (2018):73-74,
https://hdl.handle.net/21.15107/rcub_machinery_6796 .

TY  - JOUR
AU  - Mladenović, Nataša N.
AU  - Ivanović, Marija 
AU  - Kljajević, Ljiljana
AU  - Nenadović, Snežana S.
AU  - Gulicovski, Jelena J.
AU  - Pavlović, Vera P.
AU  - Trivuna, Katarina V.
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2773
AB  - Za uklanjanje jona kadmijuma iz otpadnih voda korišćeni su alumosilikatni polimeri (geopolimeri) na bazi metakaolina kao prekursora i alkalni aktivator različitih koncentracija (2M, 4M, 6M i 8M NaOH/ Na2SiO3). Eksperimenti su vršeni u šaržnom procesu na sobnoj temperaturi (23±1 °C) pri različitim radnim parametrima: vreme adsorpcije, pH vrednost rastvora, početna koncentracija metala i masa adsorbenata. Utvrđeno je da je optimalna pH vrednost za sve adsorbente iznad 6,0. Efikasnost adsorpcije raste sa porastom pH vrednosti rastvora. Sa povećanjem početne koncentracije kadmijuma raste adsorpcioni kapacitet i dostiže vrednost preko 200,0 mg/g. Ekperimentalni rezultati su pokazali dobro slaganje sa Freundlich-ovom adsorpcionom izotermom i modelom pseudo-drugog reda. Karakterizacija geopolimera urađena je pomoću rendgenske difrakcije (XRD), skenirajuće elektronske mikroskopije (SEM) i infracrvene spektroskopije sa Furijeovom transformacijom (FTIR).
AB  - Alumosilicate polymers (geopolymers) based on metakaolin as precursor and alkaline activators of different concentrations (2M, 4M, 6M and 8M NaOH/Na2SiO3) were used to remove ions of cadmium from wastewater. Experiments were carried out in a batch process at room temperature (23 ± 1 ° C) for different operating parameters: adsorption time, pH value of solution, initial concentration of metal and mass of adsorbents. It was found that the optimum pH value for all adsorbents is above 6.0. The adsorption efficiency increases with increasing pH of the solution. With an increase in the initial concentration of cadmium, the adsorption capacity increases and reaches a value of over 200.0 mg/g. The experimental results have better agreement with Freundlich's adsorption isotherm (surface heterogeneity, hemisorption mechanism) and the pseudo-second order model (the principle of the chemisorption mechanism and adsorption rate depend on the adsorbent concentration). Alumosilicate geopolymer samples were characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared Spectroscopy (FTIR).
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika
T1  - Primena alumosilikatnih polimera na bazi metakaolina u adsorpciji jona kadmijuma iz otpadnih voda
T1  - Application of alumosilicate polymers based on metakaolin in adsorption of cadmium ions from wastewater
EP  - 756
IS  - 6
SP  - 749
VL  - 73
DO  - 10.5937/tehnika1806749M
ER  - 

@article{
author = "Mladenović, Nataša N. and Ivanović, Marija  and Kljajević, Ljiljana and Nenadović, Snežana S. and Gulicovski, Jelena J. and Pavlović, Vera P. and Trivuna, Katarina V.",
year = "2018",
abstract = "Za uklanjanje jona kadmijuma iz otpadnih voda korišćeni su alumosilikatni polimeri (geopolimeri) na bazi metakaolina kao prekursora i alkalni aktivator različitih koncentracija (2M, 4M, 6M i 8M NaOH/ Na2SiO3). Eksperimenti su vršeni u šaržnom procesu na sobnoj temperaturi (23±1 °C) pri različitim radnim parametrima: vreme adsorpcije, pH vrednost rastvora, početna koncentracija metala i masa adsorbenata. Utvrđeno je da je optimalna pH vrednost za sve adsorbente iznad 6,0. Efikasnost adsorpcije raste sa porastom pH vrednosti rastvora. Sa povećanjem početne koncentracije kadmijuma raste adsorpcioni kapacitet i dostiže vrednost preko 200,0 mg/g. Ekperimentalni rezultati su pokazali dobro slaganje sa Freundlich-ovom adsorpcionom izotermom i modelom pseudo-drugog reda. Karakterizacija geopolimera urađena je pomoću rendgenske difrakcije (XRD), skenirajuće elektronske mikroskopije (SEM) i infracrvene spektroskopije sa Furijeovom transformacijom (FTIR)., Alumosilicate polymers (geopolymers) based on metakaolin as precursor and alkaline activators of different concentrations (2M, 4M, 6M and 8M NaOH/Na2SiO3) were used to remove ions of cadmium from wastewater. Experiments were carried out in a batch process at room temperature (23 ± 1 ° C) for different operating parameters: adsorption time, pH value of solution, initial concentration of metal and mass of adsorbents. It was found that the optimum pH value for all adsorbents is above 6.0. The adsorption efficiency increases with increasing pH of the solution. With an increase in the initial concentration of cadmium, the adsorption capacity increases and reaches a value of over 200.0 mg/g. The experimental results have better agreement with Freundlich's adsorption isotherm (surface heterogeneity, hemisorption mechanism) and the pseudo-second order model (the principle of the chemisorption mechanism and adsorption rate depend on the adsorbent concentration). Alumosilicate geopolymer samples were characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared Spectroscopy (FTIR).",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika",
title = "Primena alumosilikatnih polimera na bazi metakaolina u adsorpciji jona kadmijuma iz otpadnih voda, Application of alumosilicate polymers based on metakaolin in adsorption of cadmium ions from wastewater",
pages = "756-749",
number = "6",
volume = "73",
doi = "10.5937/tehnika1806749M"
}

Mladenović, N. N., Ivanović, M., Kljajević, L., Nenadović, S. S., Gulicovski, J. J., Pavlović, V. P.,& Trivuna, K. V.. (2018). Primena alumosilikatnih polimera na bazi metakaolina u adsorpciji jona kadmijuma iz otpadnih voda. in Tehnika
Savez inženjera i tehničara Srbije, Beograd., 73(6), 749-756.
https://doi.org/10.5937/tehnika1806749M

Mladenović NN, Ivanović M, Kljajević L, Nenadović SS, Gulicovski JJ, Pavlović VP, Trivuna KV. Primena alumosilikatnih polimera na bazi metakaolina u adsorpciji jona kadmijuma iz otpadnih voda. in Tehnika. 2018;73(6):749-756.
doi:10.5937/tehnika1806749M .

Mladenović, Nataša N., Ivanović, Marija , Kljajević, Ljiljana, Nenadović, Snežana S., Gulicovski, Jelena J., Pavlović, Vera P., Trivuna, Katarina V., "Primena alumosilikatnih polimera na bazi metakaolina u adsorpciji jona kadmijuma iz otpadnih voda" in Tehnika, 73, no. 6 (2018):749-756,
https://doi.org/10.5937/tehnika1806749M . .