THE APPLICATION OF POLYTETRAFLUOROETHYLENE FIBER GRAFTED BY ACRYLIC ACID AS A CATION EXCHANGER FOR REMOVING Cu~(2+)

A novel cation exchanger fiber was prepared by irradiating grafting of acrylic acid at the surface of PTFE fibers.The novel cation exchanger fiber no t only has the advantages as a commercial cation exchanger fiber,but also has go od corrosion resistance.It was found that the pH titration curve of the grafted PTFE fiber showed a sudden jump from pH=6 to 10, which was different fr om the behavior of a typical commercial weakly acid exchanger.This novel grafte d PTFE fiber was used t o remove Cu 2+ at different pH conditions.The best pH values for the Cu 2+ adsorp tion are at 3～5.The highest adsorption capacity for Cu 2+ is 107 48?mg/ g,when the pH value is 5.The Cu 2+ ions can be desorbed completely by dilut e HCl solutions.