TY  - JOUR
AU  - Đorđević, Nataša
AU  - Mihajlović, Slavica
AU  - Vlahović, Milica
AU  - Lozanović-Sajić, Jasmina
AU  - Martinović, Sanja
PY  - 2022
UR  - https://ritnms.itnms.ac.rs/handle/123456789/635
AB  - Sodium carbonate is a well-known material for being used as a good sorbent of carbon dioxide from the atmosphere, and as such has gained increasing importance in environmental protection. In order to enhance its sorption ability, mechanochemical activation of sodium carbonate was carried out in this study while the occurred changes after the activation and the relaxation time in a controlled environment were monitored. Activation was performed in a vibro-mill from 1 to 28 min. Based on the results of specific surface area, obtained by BET, the samples activated for 2 and 7 min were chosen and placed in a moist carbon dioxide atmosphere for 96 h, a period called the relaxation time. Differential thermal and thermogravimetric analyses were applied with the aim of determining the changes that occurred on the activated samples during the relaxation period. The decomposition temperature change of activated Na2CO3 samples, as well as mass loss and conversion level of Na2CO3 to NaHCO3 were monitored depending on activation and relaxation time periods. The conversion reactions of sodium carbonate to sodium bicarbonate under the specified environment of carbon dioxide and moisture were also studied, and the thermodynamic data such are changes in enthalpy, entropy, and Gibbs energy at the temperature range of 0-160 degrees C are given.
PB  - Elsevier, Amsterdam
T2  - Thermochimica Acta
T1  - Thermal analysis and phase changes of mechanochemically activated sodium carbonate
VL  - 708
DO  - 10.1016/j.tca.2021.179139
UR  - conv_931
ER  - 

@article{
author = "Đorđević, Nataša and Mihajlović, Slavica and Vlahović, Milica and Lozanović-Sajić, Jasmina and Martinović, Sanja",
year = "2022",
abstract = "Sodium carbonate is a well-known material for being used as a good sorbent of carbon dioxide from the atmosphere, and as such has gained increasing importance in environmental protection. In order to enhance its sorption ability, mechanochemical activation of sodium carbonate was carried out in this study while the occurred changes after the activation and the relaxation time in a controlled environment were monitored. Activation was performed in a vibro-mill from 1 to 28 min. Based on the results of specific surface area, obtained by BET, the samples activated for 2 and 7 min were chosen and placed in a moist carbon dioxide atmosphere for 96 h, a period called the relaxation time. Differential thermal and thermogravimetric analyses were applied with the aim of determining the changes that occurred on the activated samples during the relaxation period. The decomposition temperature change of activated Na2CO3 samples, as well as mass loss and conversion level of Na2CO3 to NaHCO3 were monitored depending on activation and relaxation time periods. The conversion reactions of sodium carbonate to sodium bicarbonate under the specified environment of carbon dioxide and moisture were also studied, and the thermodynamic data such are changes in enthalpy, entropy, and Gibbs energy at the temperature range of 0-160 degrees C are given.",
publisher = "Elsevier, Amsterdam",
journal = "Thermochimica Acta",
title = "Thermal analysis and phase changes of mechanochemically activated sodium carbonate",
volume = "708",
doi = "10.1016/j.tca.2021.179139",
url = "conv_931"
}

Đorđević, N., Mihajlović, S., Vlahović, M., Lozanović-Sajić, J.,& Martinović, S.. (2022). Thermal analysis and phase changes of mechanochemically activated sodium carbonate. in Thermochimica Acta
Elsevier, Amsterdam., 708.
https://doi.org/10.1016/j.tca.2021.179139
conv_931

Đorđević N, Mihajlović S, Vlahović M, Lozanović-Sajić J, Martinović S. Thermal analysis and phase changes of mechanochemically activated sodium carbonate. in Thermochimica Acta. 2022;708.
doi:10.1016/j.tca.2021.179139
conv_931 .

Đorđević, Nataša, Mihajlović, Slavica, Vlahović, Milica, Lozanović-Sajić, Jasmina, Martinović, Sanja, "Thermal analysis and phase changes of mechanochemically activated sodium carbonate" in Thermochimica Acta, 708 (2022),
https://doi.org/10.1016/j.tca.2021.179139 .,
conv_931 .

TY  - JOUR
AU  - Đorđević, Nataša
AU  - Mihajlović, Slavica
AU  - Pantović-Spajić, Katarina
AU  - Lozanović-Šajić, Jasmina
AU  - Grubišić, Mirko
PY  - 2022
UR  - https://ritnms.itnms.ac.rs/handle/123456789/639
AB  - During mechanical activation, energy of treated material is increase to a higher level. This can lead to chemical transformation of the activated material. This is the point where we can talk about mechanochemical transformations that have occurred as a result of mechanical activation. The subject of this paper is to monitor mass changes of material after different degrees of activation. One of the substances which is often used in the processes of mechanochemical synthesis is sodium carbonate. The mass changes occurring during the treatment were detected and measured by various methods, depending on the processing environment. The mass increase was attributed to chemisorption of moisture and carbon-dioxide present in air, as a consequence of the sodium carbonate activation. The methods we used were calcimetric chemical analysis. According to obtained results, it was found that activated sodium carbonate is mass-transformed into sodium bicarbonate, whereby these changes are functionally dependent on activation time and the processing atmosphere.
PB  - Univerzitet u Beogradu - Rudarsko-geološki fakultet, Beograd
T2  - Podzemni radovi
T1  - Transformations of mechanochemical activated Na2CO3
EP  - 21
IS  - 41
SP  - 15
DO  - 10.5937/podrad2241015Q
UR  - conv_238
ER  - 

@article{
author = "Đorđević, Nataša and Mihajlović, Slavica and Pantović-Spajić, Katarina and Lozanović-Šajić, Jasmina and Grubišić, Mirko",
year = "2022",
abstract = "During mechanical activation, energy of treated material is increase to a higher level. This can lead to chemical transformation of the activated material. This is the point where we can talk about mechanochemical transformations that have occurred as a result of mechanical activation. The subject of this paper is to monitor mass changes of material after different degrees of activation. One of the substances which is often used in the processes of mechanochemical synthesis is sodium carbonate. The mass changes occurring during the treatment were detected and measured by various methods, depending on the processing environment. The mass increase was attributed to chemisorption of moisture and carbon-dioxide present in air, as a consequence of the sodium carbonate activation. The methods we used were calcimetric chemical analysis. According to obtained results, it was found that activated sodium carbonate is mass-transformed into sodium bicarbonate, whereby these changes are functionally dependent on activation time and the processing atmosphere.",
publisher = "Univerzitet u Beogradu - Rudarsko-geološki fakultet, Beograd",
journal = "Podzemni radovi",
title = "Transformations of mechanochemical activated Na2CO3",
pages = "21-15",
number = "41",
doi = "10.5937/podrad2241015Q",
url = "conv_238"
}

Đorđević, N., Mihajlović, S., Pantović-Spajić, K., Lozanović-Šajić, J.,& Grubišić, M.. (2022). Transformations of mechanochemical activated Na2CO3. in Podzemni radovi
Univerzitet u Beogradu - Rudarsko-geološki fakultet, Beograd.(41), 15-21.
https://doi.org/10.5937/podrad2241015Q
conv_238

Đorđević N, Mihajlović S, Pantović-Spajić K, Lozanović-Šajić J, Grubišić M. Transformations of mechanochemical activated Na2CO3. in Podzemni radovi. 2022;(41):15-21.
doi:10.5937/podrad2241015Q
conv_238 .

Đorđević, Nataša, Mihajlović, Slavica, Pantović-Spajić, Katarina, Lozanović-Šajić, Jasmina, Grubišić, Mirko, "Transformations of mechanochemical activated Na2CO3" in Podzemni radovi, no. 41 (2022):15-21,
https://doi.org/10.5937/podrad2241015Q .,
conv_238 .

TY  - JOUR
AU  - Đorđević, Nataša
AU  - Lozanović-Šajić, Jasmina
AU  - Mihajlović, Slavica
AU  - Marković, Branislav
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/606
AB  - The aim of the presented research was to analyze ceramic material based on cordierite as a function of activation time and sintering temperature. Three-component oxide mixture was prepared (MgO + Al2O3 + SiO2 in the ratio 2:2:5). To decrease the sintering temperature, 10 mass % Bi2O3 was added to this mixture. The mixtures were mechanically activated for 5 and 240 minutes in a ceramic ball mill. Activated mixtures were sintered at temperatures of 1173-1573K. XRD method was used to determine the structural transformations of the obtained products.
PB  - Univerzitet u Beogradu - Rudarsko-geološki fakultet, Beograd
T2  - Podzemni radovi
T1  - XRD analysis of activated four-component ceramics
EP  - 28
IS  - 39
SP  - 23
DO  - 10.5937/podrad2139023Q
UR  - conv_235
ER  - 

@article{
author = "Đorđević, Nataša and Lozanović-Šajić, Jasmina and Mihajlović, Slavica and Marković, Branislav",
year = "2021",
abstract = "The aim of the presented research was to analyze ceramic material based on cordierite as a function of activation time and sintering temperature. Three-component oxide mixture was prepared (MgO + Al2O3 + SiO2 in the ratio 2:2:5). To decrease the sintering temperature, 10 mass % Bi2O3 was added to this mixture. The mixtures were mechanically activated for 5 and 240 minutes in a ceramic ball mill. Activated mixtures were sintered at temperatures of 1173-1573K. XRD method was used to determine the structural transformations of the obtained products.",
publisher = "Univerzitet u Beogradu - Rudarsko-geološki fakultet, Beograd",
journal = "Podzemni radovi",
title = "XRD analysis of activated four-component ceramics",
pages = "28-23",
number = "39",
doi = "10.5937/podrad2139023Q",
url = "conv_235"
}

Đorđević, N., Lozanović-Šajić, J., Mihajlović, S.,& Marković, B.. (2021). XRD analysis of activated four-component ceramics. in Podzemni radovi
Univerzitet u Beogradu - Rudarsko-geološki fakultet, Beograd.(39), 23-28.
https://doi.org/10.5937/podrad2139023Q
conv_235

Đorđević N, Lozanović-Šajić J, Mihajlović S, Marković B. XRD analysis of activated four-component ceramics. in Podzemni radovi. 2021;(39):23-28.
doi:10.5937/podrad2139023Q
conv_235 .

Đorđević, Nataša, Lozanović-Šajić, Jasmina, Mihajlović, Slavica, Marković, Branislav, "XRD analysis of activated four-component ceramics" in Podzemni radovi, no. 39 (2021):23-28,
https://doi.org/10.5937/podrad2139023Q .,
conv_235 .