Batch and Fixed-Bed Column Adsorption of Cd(II) from Aqueous Solution onto Oxidized Bead-Shaped Activated Carbon

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  • Takeuchi Kotaku
    Graduate School of Engineering, Chiba University
  • Amano Yoshimasa
    Graduate School of Engineering, Chiba University Safety and Health Organization, Chiba University
  • Machida Motoi
    Graduate School of Engineering, Chiba University Safety and Health Organization, Chiba University
  • Imazeki Fumio
    Safety and Health Organization, Chiba University

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Batch and column adsorption of divalent cadmium ions from aqueous solution using oxidized activated carbon (OAC) was investigated. Commercially available bead-shaped activated carbon (BAC) was oxidized with ammonium persulfate, and Cd(II) adsorption experiments were performed in batch and flow systems. The total amount of Cd(II) adsorbed in the flow system was 1.7 mmol/g, which was asymptotically equal to the maximum amount adsorbed in the batch system. Regeneration of the adsorbent was evaluated via Cd(II) desorption from OAC using 0.1 M nitric acid. The total Cd(II) desorbed was approximately 1.9 mmol/g, which was nearly equivalent to the total Cd(II) adsorbed in the flow system. The amount of Cd(II) adsorbed using regenerated OAC in the 2nd-cycle was not significantly different from that adsorbed in the 1st-cycle. These results imply that OAC is prospectively reusable for Cd(II) adsorption applications.

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