膜科学与技术

[2-(甲基丙烯酰基氧基)乙基]二甲基-(3-磺酸丙基)氢氧化铵修饰的聚酰胺复合反渗透膜性能

作者：倪玲，廖骞，陈宪宏，胡群辉，彭博，路宏伟

单位： 1. 湖南工业大学，湖南株洲 412000；2.湖南澳维科技股份有限公司，湖南株洲 412000

关键词：反渗透膜；光引发剂；接枝改性；两性离子；抗污染

出版年,卷(期):页码： 2023,43(3):37-43

摘要：

以2-羟基-4'-(2-羟乙氧基)-2-甲基苯丙酮为光引发剂，在紫外光作用下，将[2-(甲基丙烯酰基氧基)乙基]二甲基-(3-磺酸丙基)氢氧化铵成功接枝到聚酰胺膜表面上，制备了表面具有两性离子基团的聚酰胺复合反渗透膜。对该膜表面形貌、化学结构、Zeta电位和亲水性进行了表征，并采用错流渗透试验对膜的分离性能和抗污染性能进行了考察。结果表明，两性离子单体通过紫外光引发接枝到聚酰胺反渗透膜表面，接枝后膜表面等电点往中性偏移。当接枝单体浓度为100mmol/L时，膜综合性能最佳，平均水通量为48.0L/（m2·h），对氯化钠的平均脱盐率达到了99.57%；牛血清白蛋白（BSA）溶液污染后膜通量衰减量为9.2%，清洗后通量恢复率达到96.9%，该膜的抗污染性能和清洗恢复性能较好。[收稿日期：2022-10-27；修改稿收到日期：0000-00-00
基金项目：2021关键技术攻关及成果转化“高性能海水淡化反渗透膜材料研发及产业化项目”（株科办【2021】42号）；湖南省自然科学基金项目（2022JJ50004）；湖南省教育厅科学研究项目（20A149）。

In this study, sulfobetaine methacrylate (SBMA), a zwitterionic compound, was successfully grafted onto the surface of polyamide thin-film composite (TFC) reverse osmosis(RO) membrane through UV grafting method. The chemical structure, surface morphology, zeta potential and hydrophilicity of the TFC RO membrane were characterized by attenuated total reflection infrared spectroscopy(ATR-FTIR), field emission scanning electron microscopy(FE-SEM), electro-kinetic analyzer and contact angle analyzer, respectively. Membrane separation performance and antifouling property were investigated through cross-flow permeation tests. The experimental results showed that the amphoteric monomer could be successfully grafted onto the surface of polyamide reverse osmosis membrane by ultraviolet radiation, and the isoelectric point of the membrane surface shifted to neutral after grafting. When the concentration of graft monomer was 100 mmol/L, the modified membrane (M-100) had the best comprehensive performance, showing an average water flux of 48.0 LMH and sodium chloride rejection of 99.57%; The flux decay of the modified membrane M-100 in filtration of bovine serum albumin (BSA) solution was 9.2%, and the flux recovery ratio after cleaning was 96.9%, indicating good anti fouling performance and cleaning recovery performance.

倪玲（1983-06）,女，辽宁庄河人，高级工程师，博士研究生，研究方向：高分子膜材料及其应用研究，E-mail：nil408@qq.com

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