Adsorption of Pb2+, Cu2+ and Co2+ by polypropylene fabric and polyethylenehollow fiber modified by radiation-induced graft copolymerization

Cation-exchange adsorbents were prepared by radiation-induced grafting of g lycidyl methacrylate (GMA) onto polypropylene (PP) fabric and polyethylene (PE) hollow fiber and subsequent phosphonation of epoxy groups of poly(GMA) graft chains. The adsorption characteristics of Pb2+, Cu2+ and Co2+ for th e two cation-exchange adsorbents were studied. In the grafting of GMA onto PP fabric, the degree of grafting (%) increased with an increase in reactio n time, reaction temperature, and pre-irradiation dose. The maximum graftin g yield was observed around 60 % CMA concentration. In 50, 130 and 250 % GM A-grafted PP fabric, the content of phosphoric acid was 1.52, 3.40 and 4.50 mmol/g at 80 degrees C in the 85 % phosphoric acid aqueous solution for 24 h, respectively. The adsorption of Pb2+, Cu2+ and Co2+ by pp fabric adsorb ent was enhanced with an increased phosphoric acid content. The order of ad sorption capacity of the PP fabric adsorbent was Pb2+>Co2+>Cu2+. In adsorpt ion of Pb2+, Cu2+ and Co2+ by PE hollow fiber, the amount of Pb2+ adsorbed by the PE hollow fiber adsorbent containing 1.21 mmol/g of -PO3H was ca. 54 .4 g per kg. The adsorption amount of Cu2+ and Co2+ the same PE hollow fibe r was ca. 21.0 g per kg and ca. 32.1 g per kg, respectively. The order of a dsorption of the PE hollow fiber adsorbent was Pb2+>Co2+>Cu2+.