Preparation of macroreticular chelating resins containing mercapto groups from 2,3-epithiopropyl methacrylate/divinylbenzene copolymer beads and their adsorption capacity |
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Authors: | Hironori maeda Hiroaki Egawa |
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Institution: | Department of Industrial Chemistry, Kumamoto Institute of Technology, Ikeda, Kumamoto 860 Japan;Department of Industrial Chemistry, Faculty of Engineering, Kumamoto University, Kurokami, Kumamoto 861 Japan |
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Abstract: | Macroreticular chelating resins containing mercapto groups were prepared by the reaction of 2,3-epithiopropyl methacrylate/divinylbenzene macroreticular copolymer beads with ethanolic potassium hydrogensulfide solution for 1 h at 50°C. The adsorption capacities of this resin for Ag+, Hg2+, Pb2+ and Cd2+ were determined at various pH values. In the acidic region, the resin shows a high affinity for Ag+ and Hg2+ and high resistance against air oxidation. Cadmium is readily eluted with 1 mol dm?3 hydrochloric acid; silver, mercury and copper ions can be eluted with 1 mol dm?3 hydrochloric acid containing 5% (w/v) thiourea. The proposed resin appears to be useful for the removal of As3+ from aqueous solutions. |
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