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    Chlorination of Iodide-Containing Waters in the Presence of CuO: Formation of Periodate

    Access Status
    Fulltext not available
    Authors
    Liu, C.
    Salhi, E.
    Croue, Jean
    Von Gunten, Urs
    Date
    2014
    Type
    Journal Article
    
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    Citation
    Liu, C. and Salhi, E. and Croue, J. and Von Gunten, U. 2014. Chlorination of Iodide-Containing Waters in the Presence of CuO: Formation of Periodate. Environmental Science and Technology. 48 (22): pp. 13173-13180.
    Source Title
    Environmental Science and Technology
    DOI
    10.1021/es5032079
    ISSN
    0013-936X
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/46071
    Collection
    • Curtin Research Publications
    Abstract

    It has been shown previously that the disproportionation of halogen-containing oxidants (e.g., HOCl, HOBr, and ClO2) is enhanced by a CuO-catalyzed process. In this study, the transformation of iodine during chlorination in the presence of CuO was investigated. There is no significant enhancement of the disproportionation of hypoiodous acid (HOI) in the presence of CuO. Theformation rate of iodate (IO3-) in the CuO-HOCl-I- system significantly increased when compared to homogeneous solutions, which was ascribed to the activation of HOCl by CuO enhancing its reactivity toward HOI. In this reaction system, iodate formation rates increase with increasing CuO(0-0.5 g L-1) and bromide (0-2 µM) doses and with decreasing pH (9.6-6.6). Iodate does not adsorb to the CuO surfaces used in this study. Nevertheless, iodate concentrations decreased after a maximum was reached in the CuO-HOCl-I-(-Br-) systems. Similarly, the iodate concentrations decrease as a function of time in the CuO-HOCl-IO3- or CuO-HOBr-IO3-system, and the rates increase with decreasing pH (9.6-6.6) due to the enhanced reactivity of HOCl or HOBr in the presence of CuO. It could be demonstrated that iodate is oxidized to periodate by a CuO-activated hypohalous acid, which is adsorbed on the CuO surface. No periodate could be measured in filtered solutions because it was mainly adsorbed to CuO. The adsorbed periodate was identified by scanning electron microscopy plus energy dispersive spectroscopy and X-ray photoelectron spectroscopy.

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