Adsorption of Pb2+ and Pd2+ on polyethylene membrane with amino group modified by radiation-induced graft copolymerization

Six chelating hollow fiber membranes were prepared by radiation-induced gra fting of glycidyl methacrylate onto a polyethylene hollow fiber membrane an d its subsequent amination. The adsorption characteristics of Pb2+ and Pd2 for the chelating hollow fiber membranes were presented when the solution of Pb2+ and Pd2+ permeates across the chelating membrane, respectively. The degree of grafting for glycidyl methacrylate increases with increasing mon omer concentration, reaction temperature, and preirradiation dose. The adso rption of Pd2+ by chelating hollow fiber membranes modified with five kinds of amines was in the following order: diethylene triamine > hexamethyl dia mine > ethylene diamine > dimethyl amine > trimethyl amine. The chelating h ollow fiber membrane modified with iminodiacetic acid adsorbed Pb2+ ions mu ch more than Pd2+. (C) 1999 John Wiley & Sons, Inc.