Abstract Ionic and pH responsive thin film composite (TFC) membrane is prepared by interfacial polymerization of lysine and trimesoyl chloride on the out surface of poly (m-phenylene isophthalamide) hollow fiber membrane. Hydrophilicity and strong negative charge of the TFC membrane are obtained by introducing a large amount of carboxylic groups in the cross-linked polyamide network, endorsing the ionic and pH response of the TFC membrane in terms of flux and rejection. The TFC membrane shows almost 100% rejection for Eriochrome black T, with a flux of 35.8 L/m2h (0.2 MPa) at low pH and salt concentration. However, the rejection decreases to 95.8%, and the flux increases more than three times at high pH and salt concentration due to the shift of the interaction in the polyamide network from hydrogen bonding to static-electric repulsion. The responsive TFC membrane also shows great performance in separation of dye-salt mixture and dye mixture.

中文翻译：

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用于分子分离的离子和pH响应薄膜复合中空纤维纳滤膜

摘要 通过赖氨酸和均苯三甲酰氯在聚（间苯二甲酰胺）中空纤维膜的外表面进行界面聚合制备离子和pH响应薄膜复合（TFC）膜。TFC 膜的亲水性和强负电荷是通过在交联聚酰胺网络中引入大量羧基获得的，支持 TFC 膜在通量和截留方面的离子和 pH 响应。TFC 膜对铬黑 T 显示出几乎 100% 的截留率，在低 pH 值和盐浓度下的通量为 35.8 L/m2h (0.2 MPa)。然而，由于聚酰胺网络中的相互作用从氢键键合到静电排斥力的转变，截留率降低到 95.8%，并且在高 pH 值和盐浓度下通量增加了三倍以上。