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    Quantum-sized BiVO4 modified TiO2 microflower composite heterostructures: Efficient production of hydroxyl radicals towards visible light-driven degradation of gaseous toluene

    Access Status
    Fulltext not available
    Authors
    Sun, J.
    Li, Xin Yong
    Zhao, Q.
    Tadé, Moses
    Liu, Shaomin
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sun, J. and Li, X.Y. and Zhao, Q. and Tadé, M. and Liu, S. 2015. Quantum-sized BiVO4 modified TiO2 microflower composite heterostructures: Efficient production of hydroxyl radicals towards visible light-driven degradation of gaseous toluene. Journal of Materials Chemistry A. 3 (43): pp. 21655-21663.
    Source Title
    Journal of Materials Chemistry A
    DOI
    10.1039/c5ta05659d
    ISSN
    2050-7488
    Faculty
    Faculty of Science and Engineering
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/44537
    Collection
    • Curtin Research Publications
    Abstract

    © The Royal Society of Chemistry 2015. In an effort to develop visible-light-driven heterostructured photocatalysts with high activity, a novel quantum-sized tubelike BiVO4 sensitized TiO2 microflower catalytic system was successfully fabricated by using a facile hydrothermal and ultrasonic adhering approach. The structural and optical properties of the as-prepared samples were comparatively characterized. The staggered band structure of quantum-sized BiVO4 decorated TiO2 not only extended the photo-response range but also promoted photoexcited charges transfer and separation. Photocatalytic activities of the as-prepared samples were examined by the degradation of toluene under visible light irradiation (? > 400 nm). Compared to the individual TiO2 microflower, BiVO4 quantum tube, BiVO4 nanoparticle and nano-BiVO4/TiO2, the quantum-BiVO4/TiO2 (Q-BiVO4/TiO2) composite exhibited higher photo activities. Electron spin resonance (ESR) examinations confirmed the generation of the photo-induced reactive oxygen species (OH and O2 -) which were involved in the photocatalytic process of Q-BiVO4/TiO2 composites. Furthermore, the enhanced photocatalytic activity of the Q-BiVO4/TiO2 composite mainly originated from the high separation efficiency of photo-induced electron-hole pairs and the efficient production of hydroxyl radicals. A detailed mechanism accounting for the superior photocatalytic activity was proposed in terms of the energy band structures of the components.

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