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    Temperature dependent photocatalysis of g-C3N4, TiO2 and ZnO: Differences in photoactive mechanism

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    Authors
    Meng, F.
    Liu, Y.
    Wang, J.
    Tan, X.
    Sun, Hongqi
    Liu, Shaomin
    Wang, Shaobin
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Meng, F. and Liu, Y. and Wang, J. and Tan, X. and Sun, H. and Liu, S. and Wang, S. 2018. Temperature dependent photocatalysis of g-C3N4, TiO2 and ZnO: Differences in photoactive mechanism. Journal of Colloid and Interface Science. 532: pp. 321-330.
    Source Title
    Journal of Colloid and Interface Science
    DOI
    10.1016/j.jcis.2018.07.131
    ISSN
    0021-9797
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/72891
    Collection
    • Curtin Research Publications
    Abstract

    Photocatalysis has been believed as one of the green and sustainable avenues to address energy and environmental crises by converting solar energy to chemical energy via reactions. Temperature is usually a vital factor controlling kinetics and thermodynamics of a reaction, but it has been less investigated in photocatalysis. In this work, the effect of reaction temperature on photocatalysis was investigated in a simple process, photocatalytic degradation of Congo Red (CR) on three typical catalysts, g-C3N4, TiO2 and ZnO, to differentiate the interfacial radical generation and reaction mechanism. The results showed that the temperature has a positive effect on the photocatalytic activity of the three catalysts. The scavenger experiments at various temperatures indicated that the generation of reactive species from the three photocatalysts is different and that the free radicals can be produced more quickly at higher temperatures, causing improved activities in photocatalysis. However, photocurrent analysis and EIS at various temperatures showed that the temperature had a different effect on recombination rate and transfer barriers of the charge carriers from each catalyst. Therefore, the dramatic enhancement in photodegradation activities probably originated from a novel mechanism of the photothermocatalytic oxidation. The interfacial reaction and mechanism from the influence of reaction temperature on the photocatalytic process was proposed.

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