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  • Chem Sci Trans., 2012, 1(2),  pp 371-381  

    DOI:10.7598/cst2012.208

    Research Article

    Influence of pH and Ionic Strength on the Adsorption of Copper and Zinc in Bentonite Clay

  • HAMDI A. M. BENNOUR
  • Department of Chemistry, Faculty of Science, Benghazi University, Benghazi, Libya
  • Abstract

    This study concerned with the possibility of adsorption of some metal cations such as Cu2+ and Zn2+ on bentonite ore which were used as an inorganic fertilizer. Maximum adsorption was obtained at pH 5-5.5. The relationship between the amounts of metal cations adsorbed was found to follow the Freundlich adsorption isotherm. Preferential adsorption of both ions on adsorption sites was found to take place; Cu2+ is being adsorbed at greater extent than Zn2+. Bentonite samples which allowed adsorbing Cu2+ and Zn2+ were then subjected to desorption experiments using EDTA/OAc. Sequential leaching of the adsorbed ions revealed that the amounts of desorbed ion are linearly proportional to the amount previously adsorbed.

    Keywords

    Adsorption, Cations, pH, Bentonite

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