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Influence of the gelation and calcination temperatures on physical parameters and photocatalytic activity of mesoporous titania powders synthesized by the nonhydrolytic sol-gel process

Само за регистроване кориснике
2012
Аутори
Petrović, Rada
Tanasković, N.
Đokić, Veljko
Radovanović, Željko
Janković-Častvan, Ivona
Stamenković, Ivan
Janaćković, Đorđe
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документу
Апстракт
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.

Кључне речи:
Photocatalysis / Anatase / Titania / Mesoporous / Nanoparticles
Извор:
Powder Technology, 2012, 219, 239-243
Издавач:
  • Elsevier, Amsterdam
Финансирање / пројекти:
  • Синтеза, развој технологија добијања и примена наноструктурних мултифункционалних материјала дефинисаних својстава (RS-45019)
  • EUREKA E!4141
  • Reinforcing of Nanotechnology and Functional Materials Centre (EU-245916)

DOI: 10.1016/j.powtec.2011.12.049

ISSN: 0032-5910

WoS: 000301310400031

Scopus: 2-s2.0-84856476509
[ Google Scholar ]
11
9
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2193
Колекције
  • Radovi istraživača / Researchers’ publications (TMF)
  • Radovi istraživača (Inovacioni centar) / Researchers’ publications (Innovation Centre)
Институција/група
Tehnološko-metalurški fakultet
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 . .

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