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Zeta-potentials of Oxygen and Nitrogen Enriched Activated Carbons for Removal of Copper Ion

  • Park, Kwan-Ho (Department of Chemical Engineering, Chungnam National University) ;
  • Lee, Chang-Ho (Department of Chemical Engineering, Chungnam National University) ;
  • Ryu, Seung-Kon (Department of Chemical Engineering, Chungnam National University) ;
  • Yang, Xiaoping (The Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology)
  • Received : 2007.09.03
  • Accepted : 2007.12.17
  • Published : 2007.12.30

Abstract

The oxygen and nitrogen enriched activated carbons were obtained from modification of commercial activated carbon by using nitric acid, sodium hydroxide and urea. Zeta-potentials of modified activated carbons were investigated in relation to copper ion adsorption. The structural properties of modified activated carbons were not so much changed, but the zeta-potentials and isoelectric points were considerably changed. The zeta-potential of nitric acid modified activated carbon was the most negative than other activated carbons in the entire pH region, and the $pH_{IEP}$ was shifted from pH 4.8 to 2.6, resulted in the largest copper ion adsorption capacities compare with other activated carbons in the range of pH 3~6.5. In case of urea modified activated carbon, copper ion adsorption was larger than that of the as-received activated carbon from pH 2 to pH 6.5 even though the $pH_{IEP}$ was shifted to pH 6.0, it was due to the coordination process operated between nitrogen functional groups and copper ion. The adsorption capacity of copper ion was much influenced by zeta-potential and $pH_{IEP}$ of carbon adsorbent.

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