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Thermally induced phase and photocatalytic activity evolution of polymorphous titania

Author:
Mandjoub, N.  Allen, N.  Kelly, P.  Vishnyakov, V.  


Journal:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY


Issue Date:
2010


Abstract(summary):

TiO(2) 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. (C) 2010 Elsevier B.V. All rights reserved.


Page:
125---129


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