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    Solar photocatalytic degradation of chlorophenols mixture (4-CP and 2,4-DCP): Mechanism and kinetic modelling

    Access Status
    Fulltext not available
    Authors
    Abeish, Abdul Basit Mohamad S
    Ang, Ming
    Znad, Hussein
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Abeish, A. and Ang, H. and Znad, H. 2015. Solar photocatalytic degradation of chlorophenols mixture (4-CP and 2,4-DCP): Mechanism and kinetic modelling. Journal of Environmental Science and Health, Part A. 50: pp. 125-134.
    Source Title
    Journal of Environmental Science and Health, Part A
    DOI
    10.1080/10934529.2015.975045
    ISSN
    10934529
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/40513
    Collection
    • Curtin Research Publications
    Abstract

    The solar-photocatalytic degradation mechanisms and kinetics of 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) using TiO2 have been investigated both individually and combined. The individual solar-photocatalytic degradation of both phenolic compounds showed that the reaction rates follow pseudo–first-order reaction. During the individual photocatalytic degradation of both 4-CP and 2,4-DCP under the same condition of TiO2 (0.5 g L¡1) and light intensities (1000 mW cm-2) different intermediates were detected, three compounds associated with 4-CP (hydroquinone (HQ), phenol (Ph) and 4-chlorocatechol (4-cCat)) and two compounds associated with 2,4-DCP (4-CP and Ph). The photocatalytic degradation of the combined mixture (4-CP and 2,4-DCP) was also investigated at the same conditions and different 2,4-DCP initial concentrations. The results showed that the degradation rate of 4-CP decreases when the 2,4-DCP concentration increases. Furthermore, the intermediates detected were similar to that found in the individual degradation but with high Ph concentration. Therefore, a possible reaction mechanism for degradation of this combined mixture was proposed. Moreover, a modified Langmuir–Hinshelwood (L-H) kinetic model considering all detected intermediates was developed. A good agreement between experimental and estimated results was achieved. This model can be useful for scaling-up purposes more accurately as its considering the intermediates formed, which has a significant effect on degrading the main pollutants (4-CP and 2,4-DCP).

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