Thermally induced phase and photocatalytic activity evolution of polymorphous titania

N. Mahdjoub, N. Allen, P. Kelly, V. Vishnyakov

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

TiO2 nano-powders were prepared by hydrolysing titanium tetraisopropoxide at room temperature. The resulting products were dried at 382 K and then annealed at temperatures up to 1172 K for 1 h. Raman analysis showed different titania phase structures depending on the thermal treatment. A mixture of brookite and anatase was observed in the as-prepared sample and after thermal treatment at 472 K and 672 K, a mixture of anatase and rutile was observed at 872 K and 972 K, while a pure rutile phase was identified at 1172 K. Quantitative XRD analysis revealed nano-powders phase composition and crystallite sizes. The photoactivity was assessed by photoinduced degradation of methyl orange. All anatase-brookite compositions have showed high photoactivity while the best values were observed for the sample calcined at 472 K.

LanguageEnglish
Pages125-129
Number of pages5
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume210
Issue number2-3
Early online date18 Jan 2010
DOIs
Publication statusPublished - 25 Feb 2010
Externally publishedYes

Fingerprint

anatase
Titanium dioxide
titanium
Titanium
rutile
Heat treatment
Powders
Phase structure
Crystallite size
Chemical analysis
Phase composition
quantitative analysis
degradation
Degradation
Temperature
room temperature
products
titanium dioxide
temperature

Cite this

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abstract = "TiO2 nano-powders were prepared by hydrolysing titanium tetraisopropoxide at room temperature. The resulting products were dried at 382 K and then annealed at temperatures up to 1172 K for 1 h. Raman analysis showed different titania phase structures depending on the thermal treatment. A mixture of brookite and anatase was observed in the as-prepared sample and after thermal treatment at 472 K and 672 K, a mixture of anatase and rutile was observed at 872 K and 972 K, while a pure rutile phase was identified at 1172 K. Quantitative XRD analysis revealed nano-powders phase composition and crystallite sizes. The photoactivity was assessed by photoinduced degradation of methyl orange. All anatase-brookite compositions have showed high photoactivity while the best values were observed for the sample calcined at 472 K.",
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Thermally induced phase and photocatalytic activity evolution of polymorphous titania. / Mahdjoub, N.; Allen, N.; Kelly, P.; Vishnyakov, V.

In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 210, No. 2-3, 25.02.2010, p. 125-129.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Thermally induced phase and photocatalytic activity evolution of polymorphous titania

AU - Mahdjoub, N.

AU - Allen, N.

AU - Kelly, P.

AU - Vishnyakov, V.

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Y1 - 2010/2/25

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AB - TiO2 nano-powders were prepared by hydrolysing titanium tetraisopropoxide at room temperature. The resulting products were dried at 382 K and then annealed at temperatures up to 1172 K for 1 h. Raman analysis showed different titania phase structures depending on the thermal treatment. A mixture of brookite and anatase was observed in the as-prepared sample and after thermal treatment at 472 K and 672 K, a mixture of anatase and rutile was observed at 872 K and 972 K, while a pure rutile phase was identified at 1172 K. Quantitative XRD analysis revealed nano-powders phase composition and crystallite sizes. The photoactivity was assessed by photoinduced degradation of methyl orange. All anatase-brookite compositions have showed high photoactivity while the best values were observed for the sample calcined at 472 K.

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