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 +, Hg 2+, Pb 2+ and Cd 2+ were determined at various pH values. In the acidic region, the resin shows a high affinity for Ag + and Hg 2+ 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 As 3+ from aqueous solutions.
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