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    Oxidation of iodide and iodine on birnessite (δ-MnO2) in the pH range 4-8

    133658_133658.pdf (271.2Kb)
    Access Status
    Open access
    Authors
    Allard, Sebastien
    Von Gunten, Urs
    Salhi, E.
    Nicolau, R.
    Gallard, H.
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Allard, Sebastien and Von Gunten, Urs von and Salhi, Elisabeth and Nicolau, Rudy and Gallard, Herve. 2009. Oxidation of iodide and iodine on birnessite (δ-MnO2) in the pH range 4-8. Water Research. 43 (14): pp. 3417-3426.
    Source Title
    Water Research
    DOI
    10.1016/j.watres.2009.05.018
    ISSN
    00431354
    Faculty
    Curtin Water Quality Research Centre (CWQRC)
    Faculty of Science and Engineering
    School
    Curtin Water Quality Research Centre (Industry Research Centre)
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/309/description#description. Copyright © 2009 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/22471
    Collection
    • Curtin Research Publications
    Abstract

    The oxidation of iodide by synthetic birnessite (δ-MnO2) was studied in perchlorate mediain the pH range 4-8. Iodine (I2) was detected as an oxidation product that was subsequently further oxidized to iodate (IO3). The third order rate constants, second order on iodide and first order on manganese oxide, determined by extraction of iodine in benzene decreased with increasing pH (6.3-7.5) from 1790 to 3.1 M2 s1. Both iodine and iodate were found to adsorb significantly on birnessite with an adsorption capacity of 12.7 mM/g for iodate at pH5.7. The rate of iodine oxidation by birnessite decreased with increasing ionic strength, which resulted in a lower rate of iodate formation. The production of iodine in iodide-containing waters in contact with manganese oxides may result in the formation of undesired iodinated organic compounds (taste and odor, toxicity) in natural and technical systems. The probability of the formation of such compounds is highest in the pH range 5-7.5. For pH <5 iodine is quickly oxidized to iodate, a non-toxic and stable sink for iodine. At pH >7.5, iodide is not oxidized to a significant extent.

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