A novel hydrophilic charged nanofiltration membrane was prepared via UV irradiation graft polymerization on the polyetherketone-cadro (PEK-C) ultrafiltration membrane. The influence of grafting monomer nature on the salt rejection of the membrane showed the effect of Donnan interaction on the membrane performances in nanofiltration. Based on this phenomenon, graft copolymerization with sodium styrenesulfate (SSS) and acrylic acid (AA) has been applied to the modification of PEK-C membranes. By adjusting the molar ratio of the monomers a nanofiltration membrane with higher performance has been obtained.

Key words: UV irradiation, polyetherketone-cadro, surface charged nanofiltration membrane, sodium styrene sulfonate, acrylic acid