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    Ta/TiO2-and Nb/TiO2-Mixed Oxides as Efficient Solar Photocatalysts: Preparation, Characterization, and Photocatalytic Activity

    217903_54548_Znad_-IJP-2012.pdf (3.128Mb)
    Access Status
    Open access
    Authors
    Znad, Hussein
    Ang, Ming
    Tade, Moses
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Znad, H. and Ang, M. and Tade, M. 2012. Ta/TiO2-and Nb/TiO2-Mixed Oxides as Efficient Solar Photocatalysts: Preparation, Characterization, and Photocatalytic Activity. International Journal of Photoenergy. 2012: Article ID 548158.
    Source Title
    International Journal of Photoenergy
    DOI
    10.1155/2012/548158
    ISSN
    1110662X
    School
    Department of Chemical Engineering
    Remarks

    This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons License http://creativecommons.org/licenses/by/3.0/ Please refer to the licence to obtain terms for any further reuse or distribution of this work

    URI
    http://hdl.handle.net/20.500.11937/39346
    Collection
    • Curtin Research Publications
    Abstract

    Ta/TiO2- and Nb/TiO2-mixed oxides photocatalysts were prepared by simple impregnation method at different TiO2 : Nb or Ta mass ratios of 1 : 0.1, 1 : 0.5, and 1 : 1, followed by calcination at 500∘C. The prepared powders have been characterized by XRD, XPS, UV-Vis spectra, and SEM. The photocatalytic activity was evaluated under natural solar light for decolorization and mineralization of azo dye Orange II solution. The results showed that Nb/TiO2- and Ta/TiO2-mixed oxides have higher activity than the untreated TiO2 under natural solar light. The maximum activity was observed for Nb/TiO2 sample (at mass ratio of 1 : 0.1), which is characterized by the smallest crystalline size (17.79 nm). Comparing with the untreated TiO2, the solar decolorization and mineralization rates improved by about 140% and 237%, respectively, and the band gap reduced to 2.80 eV. The results suggest that the crystal lattices of TiO2 powder are locally distorted by incorporating Nb5+ species into TiO2, forming a new band energy structure, which is responsible for the absorption in the visible region. Unlike Ta/TiO2, the Nb/TiO2-mixed oxides can prevent the grain size growth of the treated TiO2, which is important to achieve high solar photoactivity.

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