Citation: LI Ben-Xia, WANG Yan-Fen, LIU Tong-Xuan. Adjustable Synthesis and Visible-Light Responsive Photocatalytic Performance of V₂O₅·xH₂O-BiVO₄ Nanocomposites[J]. Acta Physico-Chimica Sinica, ;2011, 27(12): 2946-2952. doi: 10.3866/PKU.WHXB20112946 shu

Adjustable Synthesis and Visible-Light Responsive Photocatalytic Performance of V₂O₅·xH₂O-BiVO₄ Nanocomposites

1.
College of Materials Science and Engineering, Anhui University of Science & Technology, Huainan 232001,Anhui Province, P. R. China

Received Date: 15 July 2011
Available Online: 18 October 2011
Fund Project: 国家自然科学基金(21001003) (21001003) 安徽省自然科学基金(10040606Q15) (10040606Q15)安徽高校省级自然科学研究重点项目(KJ2010A101)资助 (KJ2010A101)

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.
- Composite photocatalyst,
- Chemical synthesis,
- Characterization,
- Photodegradation,
- Organic dye
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Adjustable Synthesis and Visible-Light Responsive Photocatalytic Performance of V₂O₅·xH₂O-BiVO₄ Nanocomposites