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    Synthesis of carbon xerogels at varying sol–gel pHs, dye adsorption and chemical regeneration

    Access Status
    Fulltext not available
    Authors
    Zhou, Guanliang
    Tian, Hu-Yong
    Sun, Hongqi
    Wang, Shaobin
    Buckley, Craig
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhou, Guanliang and Tian, Huyong and Sun, Hongqi and Wang, Shaobin and Buckley, Craig Edward. 2011. Synthesis of carbon xerogels at varying sol–gel pHs, dye adsorption and chemical regeneration. Chemical Engineering Journal. 171 (3): pp. 1399-1405.
    Source Title
    Chemical Engineering Journal
    DOI
    10.1016/j.cej.2011.05.054
    ISSN
    13858947
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/4162
    Collection
    • Curtin Research Publications
    Abstract

    Several carbon xerogels were synthesized at varying sol–gel pHs of 6–10 using KOH as a catalyst. The porous structure, dye adsorption and regeneration by chemical oxidation of the carbon xerogels were comprehensively investigated. It was found that sol–gel pH significantly affected the porous structure and adsorption properties of carbon xerogels. The sol–gel pHs of 6–9 did not have a significant influence on surface area, micropore surface area, crystalline structure, combustion and desorption behavior of carbon xerogels, however, the pore size was different with development of mesopores at higher pH. When the pH was higher than 9, the carbon xerogel still possessed a highly porous structure. The surface area, micropore surface area, and combustion temperature could be reduced by 30%. Adsorption tests demonstrated high capacity of the carbon xerogels in dye adsorption. Due to loss of surface area and pore volume, the carbon xerogel synthesized at higher pH (>9) exhibited lower dye adsorption. For different types of dye, the carbon xerogels exhibited strong adsorption capacity for methylene blue and acid blue 40, but low adsorption of reactive black 5. Regeneration of the carbon xerogels using a chemical oxidation with Co2+/oxone recovered the adsorption capacity by 70%.

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