Photocatalytic Properties of Nanocrystalline TiO2 Synthesized by Highpressure Microwave Method

doi:10.3724/SP.J.1077.2010.00375

Abstract

Abstract: Nanocrystalline TiO₂ powders were synthesized from TiCl₄ solution by the highpressure microwave method under pressure ranging from 0.1MPa to 4.0MPa. The phase structures, microstructures and photocatalytic properties of the nanocrystalline
TiO2 were investigated. It was found that the reaction pressure had a large impact on the phase structures, microstructures,
and photocatalytic properties of the nanocrystalline TiO₂. Under lower reaction pressure, TiO2 products consisted of anatase
and brookite phase, with the brookite phase in minority, while under higher reaction pressure, a large quantity of rutile
TiO₂ was formed. With the increase of reaction pressure from 0.1MPa to 4.0MPa, the average sizes of the TiO₂ nanoparticles
increased from 5nm to 30nm. At reaction pressures lower than 2.0MPa, the photocatalytic performance of the nanocrystalline
TiO₂ increased with the pressure, while at pressures higher than 2.0MPa, the photocatalytic performance was found to decrease
monotonically with the pressure.

Key words: high-pressure microwave synthesis, nanocrystalline TiO₂, photocatalysis

CLC Number:

O643

LIU Yu,ZHANG Ting,FU Min-Gong,LI Wang,DU Guo-Ping. Photocatalytic Properties of Nanocrystalline TiO₂ Synthesized by Highpressure Microwave Method[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00375.

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Photocatalytic Properties of Nanocrystalline TiO₂ Synthesized by Highpressure Microwave Method

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