Adsorption of Heavy Metal onto Activated Carbon Modified with Potassium Permanganate

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  • Pang Meiling
    Graduate School of Science and Technology, Niigata University Department of Chemistry and Chemical Engineering, Qiqihar University
  • Xu Liang
    Graduate School of Science and Technology, Niigata University
  • Kano Naoki
    Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University
  • Imaizumi Hiroshi
    Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University

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This study investigated the adsorption of lead ions (Pb2+) by activated carbon modified with potassium permanganate (KMnO4). Activated carbon was chemically modified through impregnation with solutions of KMnO4 (0.01 mol/L and 0.03 mol/L). Adsorption experiments from aqueous solutions containing known amounts of Pb2+ were explored in a batch system. The amount of Pb2+ adsorbed at different pH values, initial concentrations, sorbent dosages, contact times, and temperature were determined by atomic absorption spectrometry (AAS) in order to determine the optimum conditions for Pb2+ adsorption. Moreover, the effects of common ions like sodium, potassium, calcium, and magnesium on the adsorption capacity were also studied. The Pb2+ adsorption on modified and unmodified activated carbon conformed to the Langmuir isothermal adsorption equation. Overall the modified activated carbon exhibited a higher adsorption capacity and stronger chemical affinity than pristine activated carbon. The rates of adsorption were found to conform to pseudo-second order kinetics.

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