聚多巴胺涂覆改性聚丙烯腈纳米纤维膜及其油水分离性能

摘要

Polydopamine (PDA)/polyacrylonitrile (PAN) nanofiber composite membranes were prepared by electrospinning PAN nanofiber membranes coated with PDA.The surface morphology,mechanical property,pore size distribution,pure water flux and emulsion rejection rate were tested to characterize the coating effect.Results show that after coating,the tensile strength is increased;pure water flux is improved distinctly and up to 14 656 L/(m2 · h) when the concentration of coating solution is 1 mg/mL,increasing by 63％ compared to the neat PAN nanofiber membranes;the minimum pore size is obtained when the concentration of coating solution is 1.5 mg/mL,and the emulsion rejection rate is reached to the best value of 96.1％,ensuring high pure water flux and high emulsion rejection rate simultaneously.%以聚多巴胺(PDA)为涂层剂,静电纺聚丙烯腈(PAN)纳米纤维膜为基体,制备了PDA/PAN纳米纤维复合材料,测试多巴胺涂层处理对复合材料的表面形貌、力学性能、孔径分布、纯水通量与乳化油截留率等相关性能的影响.研究结果表明:涂层后的静电纺纳米纤维断裂强度明显增加;膜纯水通量明显增大,在涂层液质量浓度为1 mg/mL时静电纺纳米纤维膜纯水通量最高达到14 656 L/(m2·h),较未改性纳米纤维膜增加63％;在涂层液质量浓度为1.5 mg/mL时纤维膜获得了最小孔径,其乳化油截留率也达到最佳值(96.1％),同时可以保证高水通量和高乳化油截留率.