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Acta Phys. -Chim. Sin.  2015, Vol. 31 Issue (3): 540-544    DOI: 10.3866/PKU.WHXB201501131
CATALYSIS AND SURFACE SCIENCE     
Improved Photocatalytic Degradation of Phenol over β-Bi2O3 Modified Bi2WO6 and Possible Mechanism
LI Xiao-Jin, SHENG Jia-Yi, CHEN Hai-Hang, XU Yi-Ming
State Key Laboaratory of Silicon, Departement of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
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Abstract  

In this study, a series of Bi2O3-containing Bi2WO6 catalysts were prepared by a simple mixing method. We used the oxidation of phenol in water under UV light as a model reaction, and found that as the amount of Bi2O3 in the mixture increased, its photocatalytic activity increased, and then started to decrease. A maximum activity was observed with the catalyst containing 12.5% (mass fraction, w) of Bi2O3, about 4 times that of Bi2WO6. Solid characterization revealed that the composite was a mixture of β-Bi2O3 and Bi2WO6. The water oxidation photocurrent over the β-Bi2O3/Bi2WO6 thin film electrode was much larger than the sum of the photocurrents of the β-Bi2O3 and Bi2WO6 thin film electrodes. It is proposed that there is a valence hole transfer from Bi2WO6 to β-Bi2O3, which improves the charge separation efficiency, and consequently increases the rate of phenol degradation.



Key wordsBismuth oxide      Bismuth tungstate      Photocatalysis      Charge transfer      Organic degradation     
Received: 30 October 2014      Published: 13 January 2015
MSC2000:  O643  
Fund:  

The project was supported by the National Natural Science Foundation of China (21377110) and National Key Basic Research Program of China (973) (2011CB936003).

Corresponding Authors: XU Yi-Ming     E-mail: xuym@zju.edu.cn
Cite this article:

LI Xiao-Jin, SHENG Jia-Yi, CHEN Hai-Hang, XU Yi-Ming. Improved Photocatalytic Degradation of Phenol over β-Bi2O3 Modified Bi2WO6 and Possible Mechanism. Acta Phys. -Chim. Sin., 2015, 31(3): 540-544.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201501131     OR     http://www.whxb.pku.edu.cn/Y2015/V31/I3/540

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