物理化学学报2011，Vol.27Issue(12)：2946-2952,7.DOI:10.3866/PKU.WHXB20112946
V2O5·xH2O-BiVO4纳米复合材料的可控合成和可见光响应的光催化性质
Adjustable Synthesis and Visible-Light Responsive Photocatalytic Performance of V2O5·xH2O-BiVO4 Nanocomposites
摘要
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 2O5·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.关键词
复合光催化剂/化学合成/表征/光降解/有机染料Key words
Composite photocatalyst/Chemical synthesis/Characterization/Photodegradation/Organic dye分类
化学化工引用本文复制引用
李本侠,王艳芬,刘同宣..V2O5·xH2O-BiVO4纳米复合材料的可控合成和可见光响应的光催化性质[J].物理化学学报,2011,27(12):2946-2952,7.基金项目
国家自然科学基金(21001003),安徽省自然科学基金(10040606Q15)及安徽高校省级自然科学研究重点项目(KJ2010A101)资助 （21001003）
