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Acta Phys. -Chim. Sin.  2011, Vol. 27 Issue (12): 2946-2952    DOI: 10.3866/PKU.WHXB20112946
PHYSICAL CHEMISTRY OF MATERIALS     
Adjustable Synthesis and Visible-Light Responsive Photocatalytic Performance of V2O5·xH2O-BiVO4 Nanocomposites
LI Ben-Xia, WANG Yan-Fen, LIU Tong-Xuan
College of Materials Science and Engineering, Anhui University of Science & Technology, Huainan 232001,Anhui Province, P. R. China
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Abstract  V2O5·xH2O-BiVO4 composite photocatalysts were synthesized using monoclinic V2O5·xH2O nanowires as a precursor under mild conditions. To determine the synthesis-time-dependent phase content, morphology, and photocatalytic performance of the products, three typical V2O5·xH2O-BiVO4 samples were obtained at 6, 12, and 24 h. These samples were investigated using X-ray diffraction, fieldemission scanning electron microscopy, UV-visible diffusion reflectance spectroscopy, and a photocatalytic property test. The results indicate that the V2O5·xH2O-BiVO4 nanocomposites are composed of V2O5·xH2O nanowires and BiVO4 nanocrystals. As the reaction time was extended, the amount of V2O5·xH2O nanowires decreased gradually and that of the BiVO4 nanocrystals increased in the composite. The results of photocatalytic performance indicated that the V2O5·xH2O-BiVO4 composite photocatalysts exhibited enhanced photocatalytic efficiency for the degradation of methylene blue (MB) under visible-light irradiation (λ>400 nm). The V2O5·xH2O-BiVO4 sample obtained at 12 h exhibited the best photocatalytic activity, which is probably because of the appropriate proportion of components and the special microstructures of the sample that were favorable for a synergistic effect between the two photocatalysis mechanisms involving the excitation of the semiconductor and the excitation of the dye, respectively.

Key wordsComposite photocatalyst      Chemical synthesis      Characterization      Photodegradation      Organic dye     
Received: 15 July 2011      Published: 18 October 2011
MSC2000:  O643  
Fund:  

The project was supported by the National Natural Science Foundation of China (21001003), Natural Science Foundation of Anhui Province, China (10040606Q15), and Natural Science Research for Colleges and Universities of Anhui Province, China (KJ2010A101).

Corresponding Authors: LI Ben-Xia     E-mail: bxli@aust.edu.cn
Cite this article:

LI Ben-Xia, WANG Yan-Fen, LIU Tong-Xuan. Adjustable Synthesis and Visible-Light Responsive Photocatalytic Performance of V2O5·xH2O-BiVO4 Nanocomposites. Acta Phys. -Chim. Sin., 2011, 27(12): 2946-2952.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20112946     OR     http://www.whxb.pku.edu.cn/Y2011/V27/I12/2946

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