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    Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface

    Access Status
    Fulltext not available
    Authors
    Luo, J.
    Song, G.
    Liu, Jian
    Qian, G.
    Xu, Z.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Luo, J. and Song, G. and Liu, J. and Qian, G. and Xu, Z. 2014. Mechanism of enhanced nitrate reduction via micro-electrolysis at the powdered zero-valent iron/activated carbon interface. Journal of Colloid and Interface Science. 435: pp. 21-25.
    Source Title
    Journal of Colloid and Interface Science
    DOI
    10.1016/j.jcis.2014.08.043
    ISSN
    0021-9797
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/73100
    Collection
    • Curtin Research Publications
    Abstract

    © 2014. Nitrate reduction by zero-valent iron (Fe0) powder always works well only at controlled pH lower than 4 due to the formation of iron (hydr)oxides on its surface. Fe0powder combined with activated carbon (AC), i.e., Fe0/AC micro-electrolysis system, was first introduced to enhance nitrate reduction in aqueous solution. Comparative study was carried out to investigate nitrate reduction by Fe0/AC system and Fe0under near-neutral conditions, showing that the Fe0/AC system successfully reduced nitrate even at initial pH 6 with the reduction efficiency of up to 73%, whereas for Fe0only ~10%. The effect of Fe0to AC mass ratio on nitrate reduction efficiency was examined. Easier nitrate reduction was achieved with more contact between Fe0and AC as the result of decreasing Fe0to AC mass ratio. Ferrous ion and oxidation-reduction potential were measured to understand the mechanism of enhanced nitrate reduction by Fe0/AC micro-electrolysis. The results suggest that a relative potential difference drives much more electrons from Fe0to AC, thus generating adsorbed atomic hydrogen which makes it possible for nitrate to be reduced at near-neural pH. Fe0/AC micro-electrolysis thus presents a great potential for practical application in nitrate wastewater treatment without excessive pH adjustment.

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