TY  - JOUR
AU  - Petrović, Rada
AU  - Tanasković, N.
AU  - Đokić, Veljko
AU  - Radovanović, Željko
AU  - Janković-Častvan, Ivona
AU  - Stamenković, Ivan
AU  - Janaćković, Đorđe
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2193
AB  - Titania powders were synthesized by nonhydrolitic sol-gel process starting from titanium(IV)-chloride, titanium(IV)-isopropoxide and carbon-tetrachloride. Gelation was performed in solvothermal conditions, at 140 degrees C or 160 degrees C. The obtained gels were then dried and calcined at 500 degrees C or 750 degrees C. Dry gels and powders obtained by their calcination at 500 degrees C contained only anatase, and the degree of crystallinity increased notably on passing from the dry gels to the powders. The crystallite size of dry gels and powders obtained at 500 degrees C increased slightly with increasing temperature of the gelation. The powder obtained at the higher gelation temperature had a larger specific surface area (52.8 m(2) g(-1)) and a smaller maximum pore diameter (12.3 nm). When the calcination temperature was increased to 750 degrees C, the obtained powders contained both anatase and rutile. The rutile content in the powders is related to the degree of crystallinity of the dry gels: with a lower level of dry gel crystallinity, the rutile content in the powders becomes higher, indicating that the temperature of the anatase - gt  rutile transformation decreases with decreasing the size of anatase crystallites. The photocatalytic activity of the powders obtained by gel calcination at 500 degrees C, tested by measuring the photocatalytic degradation of the azo dye CI Reactive orange 16, was sufficiently high and attained the photocatalytic activity of the broadly accepted commercial powder P-25 produced by Degussa. The photocatalytic activity of the powders obtained by calcination at 750 degrees C was low, but showed a tendency to increase with higher anatase content in the powders.
PB  - Elsevier, Amsterdam
T2  - Powder Technology
T1  - Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process
EP  - 243
SP  - 239
VL  - 219
DO  - 10.1016/j.powtec.2011.12.049
ER  - 

@article{
author = "Petrović, Rada and Tanasković, N. and Đokić, Veljko and Radovanović, Željko and Janković-Častvan, Ivona and Stamenković, Ivan and Janaćković, Đorđe",
year = "2012",
abstract = "Titania powders were synthesized by nonhydrolitic sol-gel process starting from titanium(IV)-chloride, titanium(IV)-isopropoxide and carbon-tetrachloride. Gelation was performed in solvothermal conditions, at 140 degrees C or 160 degrees C. The obtained gels were then dried and calcined at 500 degrees C or 750 degrees C. Dry gels and powders obtained by their calcination at 500 degrees C contained only anatase, and the degree of crystallinity increased notably on passing from the dry gels to the powders. The crystallite size of dry gels and powders obtained at 500 degrees C increased slightly with increasing temperature of the gelation. The powder obtained at the higher gelation temperature had a larger specific surface area (52.8 m(2) g(-1)) and a smaller maximum pore diameter (12.3 nm). When the calcination temperature was increased to 750 degrees C, the obtained powders contained both anatase and rutile. The rutile content in the powders is related to the degree of crystallinity of the dry gels: with a lower level of dry gel crystallinity, the rutile content in the powders becomes higher, indicating that the temperature of the anatase - gt  rutile transformation decreases with decreasing the size of anatase crystallites. The photocatalytic activity of the powders obtained by gel calcination at 500 degrees C, tested by measuring the photocatalytic degradation of the azo dye CI Reactive orange 16, was sufficiently high and attained the photocatalytic activity of the broadly accepted commercial powder P-25 produced by Degussa. The photocatalytic activity of the powders obtained by calcination at 750 degrees C was low, but showed a tendency to increase with higher anatase content in the powders.",
publisher = "Elsevier, Amsterdam",
journal = "Powder Technology",
title = "Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process",
pages = "243-239",
volume = "219",
doi = "10.1016/j.powtec.2011.12.049"
}

Petrović, R., Tanasković, N., Đokić, V., Radovanović, Ž., Janković-Častvan, I., Stamenković, I.,& Janaćković, Đ.. (2012). Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process. in Powder Technology
Elsevier, Amsterdam., 219, 239-243.
https://doi.org/10.1016/j.powtec.2011.12.049

Petrović R, Tanasković N, Đokić V, Radovanović Ž, Janković-Častvan I, Stamenković I, Janaćković Đ. Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process. in Powder Technology. 2012;219:239-243.
doi:10.1016/j.powtec.2011.12.049 .

Petrović, Rada, Tanasković, N., Đokić, Veljko, Radovanović, Željko, Janković-Častvan, Ivona, Stamenković, Ivan, Janaćković, Đorđe, "Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process" in Powder Technology, 219 (2012):239-243,
https://doi.org/10.1016/j.powtec.2011.12.049 . .

TY  - JOUR
AU  - Tanasković, N.
AU  - Radovanović, Željko
AU  - Đokić, Veljko
AU  - Krstić, Jugoslav
AU  - Drmanić, Saša
AU  - Janaćković, Đorđe
AU  - Petrović, Rada
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1510
AB  - Mesoporous titania with well-crystallized anatase phase was synthesized by nonhydrolytic sol-gel process combined with solvothermal treatment. Titanium-isopropoxide, titanium-tetrachloride, and carbon-tetrachloride were used for synthesis under nitrogen atmosphere in a glove box. The obtained mixture was heated in an autoclave at 140 degrees C for 3 h and 30 h. XRD analysis showed that dry gels contained anatase phase with low crystallinity, while powders obtained by calcination of dry gels at 500 degrees C for 3 h consisted of pure anatase with high crystallinity. SEM analysis of dried gels and powders shows agglomerates of spherical particles of the size similar to 300 nm. The TEM micrographs confirmed the nanoscale size of the titania powders, with the primary particle size of about 20 nm. Titania powders exhibit maximum pore diameter of 13.2 nm and 9.5 nm for gelation time 3 h and 30 h, respectively. The photocatalytic activity of such synthesized titania is superior to that of commercial photocatalyst Degussa P-25.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Superlattices and Microstructures
T1  - Synthesis of mesoporous nanocrystalline titania powders by nonhydrolitic sol-gel method
EP  - 222
IS  - 1-2
SP  - 217
VL  - 46
DO  - 10.1016/j.spmi.2008.12.028
ER  - 

@article{
author = "Tanasković, N. and Radovanović, Željko and Đokić, Veljko and Krstić, Jugoslav and Drmanić, Saša and Janaćković, Đorđe and Petrović, Rada",
year = "2009",
abstract = "Mesoporous titania with well-crystallized anatase phase was synthesized by nonhydrolytic sol-gel process combined with solvothermal treatment. Titanium-isopropoxide, titanium-tetrachloride, and carbon-tetrachloride were used for synthesis under nitrogen atmosphere in a glove box. The obtained mixture was heated in an autoclave at 140 degrees C for 3 h and 30 h. XRD analysis showed that dry gels contained anatase phase with low crystallinity, while powders obtained by calcination of dry gels at 500 degrees C for 3 h consisted of pure anatase with high crystallinity. SEM analysis of dried gels and powders shows agglomerates of spherical particles of the size similar to 300 nm. The TEM micrographs confirmed the nanoscale size of the titania powders, with the primary particle size of about 20 nm. Titania powders exhibit maximum pore diameter of 13.2 nm and 9.5 nm for gelation time 3 h and 30 h, respectively. The photocatalytic activity of such synthesized titania is superior to that of commercial photocatalyst Degussa P-25.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Superlattices and Microstructures",
title = "Synthesis of mesoporous nanocrystalline titania powders by nonhydrolitic sol-gel method",
pages = "222-217",
number = "1-2",
volume = "46",
doi = "10.1016/j.spmi.2008.12.028"
}

Tanasković, N., Radovanović, Ž., Đokić, V., Krstić, J., Drmanić, S., Janaćković, Đ.,& Petrović, R.. (2009). Synthesis of mesoporous nanocrystalline titania powders by nonhydrolitic sol-gel method. in Superlattices and Microstructures
Academic Press Ltd- Elsevier Science Ltd, London., 46(1-2), 217-222.
https://doi.org/10.1016/j.spmi.2008.12.028

Tanasković N, Radovanović Ž, Đokić V, Krstić J, Drmanić S, Janaćković Đ, Petrović R. Synthesis of mesoporous nanocrystalline titania powders by nonhydrolitic sol-gel method. in Superlattices and Microstructures. 2009;46(1-2):217-222.
doi:10.1016/j.spmi.2008.12.028 .

Tanasković, N., Radovanović, Željko, Đokić, Veljko, Krstić, Jugoslav, Drmanić, Saša, Janaćković, Đorđe, Petrović, Rada, "Synthesis of mesoporous nanocrystalline titania powders by nonhydrolitic sol-gel method" in Superlattices and Microstructures, 46, no. 1-2 (2009):217-222,
https://doi.org/10.1016/j.spmi.2008.12.028 . .