IMPROVEMENT OF PHOTOCATALYTIC ACTIVITY OFTiO2VIA COMBINED ROUTE OF METAL DOPING AND SURFACE ACIDIFICATION

Yong Luan, Pingfeng Fu and Xuegang Dai ()
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Yong Luan: Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, P. R. China
Pingfeng Fu: Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, P. R. China
Xuegang Dai: Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, P. R. China

Surface Review and Letters (SRL), 2006, vol. 13, issue 04, 429-438

Abstract: In the present work, a combined route involving first doping of iron or neodymium ions via sol–gel method followed by acidification of the metal-dopedTiO2particles for the improvement of the photocatalytic capability ofTiO2was reported. The obtained metal-doped/acidifiedTiO2photocatalysts were thoroughly characterized by X-ray diffraction, Fourier transform infrared analysis, and photoluminescence emission spectra. At the same time, their photocatalytic activities were evaluated in simulant photodegradation of methylene blue (MB). The results based on these characterizations showed that not only a rutile layer formed on the surface of originalTiO2particles after surface cladding, but also the dopedFeorNdion had a favorable effect on suppression of the electron–hole recombination in the titania under ultraviolet light irradiation. Furthermore, the photocatalytic activity of the material obtained byFedoping and acidification was substantially improved in comparison to the untreatedTiO2. However, the sample prepared fromNd-doping and acidification ofTiO2showed decreased capability relative to the untreatedTiO2in degradation of MB under similar conditions. Finally, the reason why the photocatalytic activities of the obtained catalysts are sensitive to the metal-doping was discussed in details.

Keywords: TiO2; metal; doping; modification; photocatalysis (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1142/S0218625X06008402

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