膜科学与技术

溴化聚苯醚超滤膜的表面亲水改性

作者：胡虹，董君，林小城

单位： 1. 南京科技职业学院生物与环境学院，南京，210048；2. 福州大学石油化工学院，福州，350108

关键词：超滤膜；蛋白质；表面亲水改性；一步法；抗污染；溴化聚苯醚

出版年,卷(期):页码： 2020,40(2):22-29

摘要：

先以溴化聚苯醚（BPPO）为基体，利用相转化法制备超滤膜，再用聚乙烯亚胺（PEI）作为改性剂，对BPPO膜进行一步法表面亲水改性。表征结果表明，PEI的接枝对膜具有较好的交联作用，随着接枝程度的提高，膜的纯水通量从125 LMH下降至90 LMH，但截留能力随之提高，表现为剪切分子量从270 kDa下降至157 kDa。同时，随着PEI接枝量的提高，膜表面亲水的胺基含量不断提高，膜的亲水性和抗污能力随之提高。实验表明：改性膜经牛血清蛋白（BSA）溶液污染后，其纯水通量恢复率最高可达89%，相比BPPO基膜提高了约40%。

To improve anti-fouling performance of ultrafiltration membrane especially for protein separation, base ultrafiltration membrane was firstly prepared using brominated poly (phenylene oxide) (BPPO) polymer as starting material by phase inversion method, followed by directly one-step surface hydrophilic modification by polyethyleneimine (PEI). It was found that the membrane was effectively crosslinked by the grafted PEI, resulting in the weaken decrease in the pure water flux but significant improvement in the rejection. Moreover, the grated PEI could introduce abundant hydrophilic amine groups to improve the anti-fouling performance of the resultant ultrafiltration membrane. Specially, the flux recovery ratio could reach up to 89% after BSA fouling, which was 40% increase of the BPPO base membrane.

第一作者简介：胡虹（1977），女，四川广安，教授，清洁化工与环境治理研究方向，E-mail：hhu@njpi.edu.cn 通讯作者，E-mail：xclin@fzu.edu.cn

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