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    Novel microwave-assisted multiwall carbon nanotubes enhancing Cu (II) adsorption capacity in water

    Access Status
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    Authors
    Mujawar, Mubarak
    Sahu, J.
    Abdullah, E.
    Jayakumar, N.
    Ganesan, P.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Mujawar, M. and Sahu, J. and Abdullah, E. and Jayakumar, N. and Ganesan, P. 2015. Novel microwave-assisted multiwall carbon nanotubes enhancing Cu (II) adsorption capacity in water. Journal of the Taiwan Institute of Chemical Engineers. 53: pp. 140-152.
    Source Title
    Journal of the Taiwan Institute of Chemical Engineers
    DOI
    10.1016/j.jtice.2015.02.016
    ISSN
    1876-1070
    School
    Curtin Malaysia
    URI
    http://hdl.handle.net/20.500.11937/60720
    Collection
    • Curtin Research Publications
    Abstract

    Microwave induced multiwall carbon nanotubes (MWCNTs) synthesized use a tubular microwave chemical vapor deposition technique, using acetylene and hydrogen as the precursor gases, and ferrocene as the catalyst. The novel MWCNT samples tested for performances in terms of Cu (II) binding were synthesized and characterized using BET,HRTEM,FESEM analysis and using this sample adsorption of Cu (II) they were studied as a function of pH, initial Cu (II) concentration, MWCNTs dosage, agitation speed, and adsorption time. The effect of process parameters for the adsorption of Cu (II) such as pH, MWCNTs dosage, agitation speed, and adsorption time was optimized. The adsorption data followed both Freundlich and Langmuir isotherms. On the basis of the Langmuir model, q < inf > m < /inf > was calculated to be 99mg/g for microwave-synthesized MWCNTs. In order to investigate the dynamic behavior of MWCNTs as an adsorbent, the kinetic data were modelled using the pseudo-second-order and second-order. Different thermodynamic parameters, viz., ?H°, ?S° and ?G° have also been evaluated and it has been found that the adsorption was feasible, spontaneous and endothermic in nature. The statistical analysis reveals that the optimum conditions for the highest removal (99.9%) of Cu (II) are at pH 5.5, MWCNTs dosage 0.1 g, contact time 35min and agitation speed of 160rpm. Our results prove that microwave-assisted MWCNTs can be used as an effective Cu (II) adsorbent due to the high adsorption capacity as well as the short adsorption time needed to achieve an equilibrium.

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