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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 6    December 2009

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Preparation, characterization and photo-catalytic behavior of WO3-TiO2 catalysts with oxygen vacancies
TONG Hai-xia(童海霞)1, CHEN Qi-yuan(陈启元)2, YIN Zhou-lan(尹周澜)2, HU Hui-ping(胡慧萍)2,
 WU Dao-xin(吴道新)1, YANG Ya-hui(杨亚辉)

1. Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation,
Chemical and Biologic Engineering Institute, Changsha Science and Technology University, Changsha 410076, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract:TiO2 photocatalysts compounded with WO3 were prepared via a modified hydrolysis process and the 2% WO3-TiO2 catalysts with different oxygen vacancies were obtained by calcination at 873 K in H2 atmosphere. The catalysts were identified using X-ray diffractometry (XRD), specific surface measurement (BET), electron paramagnetic resonance spectroscopy (EPR), UV-Vis diffusion refraction spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of 2% WO3-TiO2 with different oxygen vacancies was investigated employing splitting of water for O2 evolution. The results indicate that appropriate oxygen vacancies can obviously improve the photocatalytic activity of 2% WO3-TiO2 catalysts, and using Fe3+ as an electron acceptor under UV irradiation in 12 h, the maximum rate for O2 evolution is 667 µmol/(L·h).

 

Key words: TiO2; oxygen vacancies; photocatalyst; calcination

ISSN 1672-7029
CN 43-1423/U

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