The preparation and the application of grafted polytetrafluoroethylene fiber as a cation exchanger for adsorption of heavy metals

摘要

A novel type of weakly acidic cation exchange fiber have been prepared by ~(60)Co irradiation grafting with acrylic acid onto the polytetrafluoroethylene (PTFE) fiber. The exchange capacity of the grafted fiber is 3.06 mmol/g. The pH titra-tion curve of the grafted fiber showed there is a sudden jump when pH is round 6-10, and the acidity of the grafted fiber is stronger than that of commercial weakly acidic exchange D-152 resin. The grafted fiber showed the excellent selectivity of static and dynamic adsorption for Cu~(2+), La~(3+) and Pb~(2+) when Mg~(2+), Ca~(2+), Cr~(3+), Co~(2+), Ni~(3+), Cu~(2+), Ag~+, La~(3+), Pb~(2+) were coexisted. The grafted fiber could be regenerated completely with almost equimolar diluted hydrochloric acid.