材料期刊网

采用原位还原法制备的银粒子对聚醚砜中空纤维超滤膜进行修饰以提高膜的抗污染能力。以聚乙烯吡咯烷酮（PVP）为分散剂,乙二醇为还原剂,在聚醚砜溶液中将硝酸银还原成银粒子,同时采用相转化法制备中空纤维超滤膜。与未修饰的聚醚砜膜相比,经过银粒子修饰的聚醚砜中空纤维膜的抗污染能力和力学性能都得到明显提高,并且膜的初始水通量和截留率也高于未修饰的膜。当PVP含量为7.5%时,银粒子修饰的聚醚砜中空纤维膜的抗污染能力达到最强,膜的综合性能达到最佳：初始水通量为183L/（m2.h）,截留率为94.5%,断裂强度为2.87MPa。在此条件下制备含银膜时,银的流失率仅为4.7%,每100g膜中银粒子的含量为4.55g。

Silver particles prepared by in situ reduction were used to modify polyethersulfone(PES) hollow fiber membranes for enhancing the antifouling property.Polyvinylpyrrolidone(PVP) used as dispersive agent and ethylene glycol used as reducing agent to reduce AgNO3 in the casting solution,phase inversion method was used to prepare silver modified PES hollow fiber membrane.The results indicated that the antifouling ability of silver modified PES hollow fiber membrane was stronger than PES hollow fiber;meanwhile the mechanical property of the modified PES hollow fiber membrane was improved.The initial water flux and reject rate of modified PES hollow fiber membrane were higher than PES hollow fiber membrane.The antifouling property of silver modified PES hollow fiber membrane was strongest when the PVP content was 7.5%,at the same time,the water flux was 183L/(m2·h),rejection rate was 94.5% and breaking strength was 2.87MPa.In this condition,the silver loss rate was only 4.7% during silver modified membrane preparation,and silver content was 4.55g per 100g membrane.