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    Removal of Zn2+ from Aqueous Solution using Castor Seed Hull

    Access Status
    Fulltext not available
    Authors
    Mohammod, M.
    Sen, Tushar
    Maitra, S.
    Dutta, B.
    Date
    2011
    Type
    Journal Article
    
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    Citation
    Mohammod, Masita and Sen, Tushar Kanti and Maitra, Saikat and Dutta, Binay K. 2011. Removal of Zn2+ from Aqueous Solution using Castor Seed Hull. Water, Air and Soil Pollution. 215: pp. 609-620.
    Source Title
    Water, Air and Soil Pollution
    DOI
    10.1007/s11270-010-0503-0
    ISSN
    00496979
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/41485
    Collection
    • Curtin Research Publications
    Abstract

    The effects of various experimental parameters on adsorption of Zn2+ metal ion from its aqueous solution by castor seed hull and also by activated carbon have been investigated using batch adsorption experiments. It has been found that the amount of zinc adsorbed per unit mass of the hull increases with the initial metal ion concentration, contact time, solution pH and with the amount of the adsorbent. Kinetic experiments clearly indicate that adsorption of zinc on both castor hull and activated carbon is a three-step process—a rapid adsorption of the metal ion, a transition phase, and an almost flat plateau. This has also been confirmed by the intraparticle diffusion model. It has also been found that the zinc adsorption process followed pseudo-second order kinetics. The kinetic parameters including rate constants have been determined at different initial metal ion concentration, pH, amount, and type of adsorbent, respectively. The Langmuir and Freundlich adsorption isotherm models have been used to interpret the equilibrium adsorption data. The Langmuir model yields better correlation coefficients. The monolayer adsorption capacities (q m ) of castor hull and activated carbon have been compared with those for others reported in the literature. The value of separation factor (R L ) derived from the Langmuir model gives an indication of favorable adsorption.Finally, from comparative studies, it has been found that castor hull is a potentially attractive adsorbent as compared to commercial activated carbon for the removal of zinc from aqueus effluents.

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