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    Synergistic and competitive adsorption of organic dyes on multiwalled carbon nanotubes

    Access Status
    Fulltext not available
    Authors
    Wang, Shaobin
    Ng., C.
    Wang, Wentai
    Li, Qin
    Hao, Z.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, S. and Ng., C. and Wang, W. and Li, Q. and Hao, Z. 2012. Synergistic and competitive adsorption of organic dyes on multiwalled carbon nanotubes. Chemical Engineering Journal. 197: pp. 34-40.
    Source Title
    Chemical Engineering Journal
    DOI
    10.1016/j.cej.2012.05.008
    ISSN
    1385-8947
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/35844
    Collection
    • Curtin Research Publications
    Abstract

    A multiwalled carbon nanotube (MWCNT) was used as an adsorbent for removal of a cationic dye(methylene blue, MB) and acid dye (acid red 183, AR183) from aqueous solution in single and binarydye systems. Characterization of the MWCNT and MWCNT-dye systems were performed using several techniques such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric–differential thermal analysis (TG–DTA), zeta potential and elemental analysis. Adsorption tests showed that the MWCNT presented higher adsorption of MB than AR183 in single and binary dye systems, revealing that p–p stacking is the main driving force responsible for the dye–MWCNT interaction. In single dye systems, the MWCNT presented the maximum adsorption capacities of MB and AR183 at 59.7 and 45.2 mg/g, respectively. In a binary dye system, a synergistic effect due to electronic attraction between MB and AR183 was found at low AR183 concentration (10 mg/L), which promotes the adsorption of both dyes on the MWCNT. However, MB adsorption could be reduced at higher AR183 concentration (>20 mg/L) due to a strong electrostatic attraction between MWCNT-AR183.

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