Heterogeneous Photocatalytic Reaction of Cr(Ⅵ) Reduction on Nanosized Titania

Abstract

Abstract: The influences of the pH value of solutions, initial concentrations of chromate, purged gas and photocatalysts loading on clean-up efficiency for Cr(Ⅵ) have been investigated. In order to study the influence of phase and size effect on the photocatalytic activities, anatase and rutile TiO₂ nanocrystallites were prepared, whose particle size is 9.5 nm(BETsurface area 133.4 m²/g) for anatase phase and 7.5 nm(BET surface area 167.6 m²/g) for rutile phase, respectively. The results of the photocatalytic reactions indicate that the phtocatalytic activity of anatase crystallite is higher than that of rutile crystallite, however, both anatase and rutile nanosized TiO₂ powders have higher photocatalytic activities than those of commercial TiO₂ powder.

Key words: Photocatalysis, Titania, Size effect, Chromate

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ZHANG Qing-Hong, GAO Lian, GUO Jing-Kun . Heterogeneous Photocatalytic Reaction of Cr(Ⅵ) Reduction on Nanosized Titania[J]. Chem. J. Chinese Universities, 2000, 21(10): 1547.

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Heterogeneous Photocatalytic Reaction of Cr(Ⅵ) Reduction on Nanosized Titania

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