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Acta Phys. Chim. Sin.  2013, Vol. 29 Issue (06): 1319-1326    DOI: 10.3866/PKU.WHXB201304012
CATALYSIS AND SURFACE SCIENCE     
Effect of Designed Zr/Ti Molar Ratio on the Photocatalytic Activity of Sr-Zr-Ti Mixed Oxide Catalysts under Visible Light
HUANG Hai-Feng1, JIA Jian-Ming1, LU Han-Feng2, ZHANG Hong-Hua1, PAN Lie-Qun3
1 College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China;
2 Research Institute of Catalytic Reaction Engineering, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China;
3 Environmental Monitoring Station of Fuyang City, Fuyang 311400, Zhejiang Province, P. R. China
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Abstract  

A series of Sr-Zr-Ti (SZT) mixed oxide catalysts were prepared by a fractional-precipitation method. These photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and ultraviolet visible (UV-Vis) diffuse reflectance absorption spectra. Photocatalytic degradation of methylene blue was investigated to determine the photoactivity of the catalyst. It was shown that with a Zr/Ti ratio<1, the SZT mixed oxide catalysts showed improved photocatalytic activity. This was attributed to lattice defects creating active photocatalytic sites because of Zr4+ doping. For Zr/Ti ratios ≥1, the catalysts showed markedly improved photocatalytic activity because of new crystalline phases of SrZrO3 and TinO2n-1 (n=4, 9)that facilitated splitting and conduction for electron/hole. Typical SZT samples (Zr/Ti=4) showed the highest photocatalytic activity, with first-order reaction rate constant 13.5 times that of a SrTiO3 sample.



Key wordsVisible light      Sr-Zr-Ti mixed oxide      Zr/Ti molar ratio      Photocatalytic degradation      Methylene blue     
Received: 20 November 2012      Published: 01 April 2013
MSC2000:  O644  
  O649  
Fund:  

The project was supported by the National Natural Science Foundation of China (21107096).

Cite this article:

HUANG Hai-Feng, JIA Jian-Ming, LU Han-Feng, ZHANG Hong-Hua, PAN Lie-Qun. Effect of Designed Zr/Ti Molar Ratio on the Photocatalytic Activity of Sr-Zr-Ti Mixed Oxide Catalysts under Visible Light. Acta Phys. Chim. Sin., 2013, 29(06): 1319-1326.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201304012     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2013/V29/I06/1319

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