Study on the Photocatalytic Activity of Rare Earth Gd-doped TiO2 Nanocrystallites under Simulated Sunlight

doi:10.7517/j.issn.1674-0475.2008.03.238

Abstract

Abstract: Gd-doped TiO₂ nanocrystallite photocatalysts were prepared by an acid-catalyzed sol-gel method. The photocatalytic decomposition of methyl orange in aqueous solution was used as a probe reaction to evaluate their photocatalytic activities and the TOC removal effect of methyl orange irradiated with a xenon lamp. The prepared samples were characterized by means of the techniques such as XRD, and UV-Vis DRS. The effects of Gd doping on the crystallite sizes, crystal pattern, and optical property of the catalysts were investigated. The results showed that the Gd doping can hinder the transformation from anatase to rutile, decrease the crystallite size of the samples, cause blue-shift of the onset of the absorption spectrum, and enhance the visible light absorption ability of TiO₂, which were responsible for the remarkable increase in photocatalytic decomposition of methyl orange on Gd-doped TiO₂ under simulated sunlight. However, the TOC removal rate was inferior to the apparent decomposition rate of methyl orange on Gd-doped TiO₂.

Key words: TiO₂, Gd-doping, simulated sunlight, methyl orange, photocatalysis

CLC Number:

O643

CAI He-shan, LIU Guo-guang, LI Xiao-xia. Study on the Photocatalytic Activity of Rare Earth Gd-doped TiO₂ Nanocrystallites under Simulated Sunlight[J]. Imaging Science and Photochemistry, 2008, 26(3): 238-243.

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Study on the Photocatalytic Activity of Rare Earth Gd-doped TiO₂ Nanocrystallites under Simulated Sunlight

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