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基于不同厂家聚醚砜基膜的薄膜复合正渗透膜性能的比较

作者：许素博，赵频，刘浩，宋伟龙，王新华

单位： 1.江南大学环境与土木工程学院，无锡 214122；2.江苏省生物质能与减碳技术工程实验室，无锡 214122；3.江苏省水处理技术与材料协同创新中心，苏州 215009

关键词：薄膜复合膜；基底膜；界面聚合反应；沥干时间；正渗透

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2024,44(2):72-79

摘要：

薄膜复合（TFC）膜由多孔基底层和通过界面聚合反应生成的聚酰胺层组成，在纳滤、反渗透和正渗透等领域已经得到了广泛的应用。近年来，基底膜对TFC膜性能的影响受到越来越多的关注。早期实验数据显示，即使在制备方法和基底膜名义孔径完全相同的条件下，由不同厂家生产的基膜所制备的TFC膜也存在显著差异。本文选择两家公司名义孔径均为0.22 μm的商品聚醚砜（PES）膜为基底，通过调节界面聚合过程水相的沥干时间，对比研究了2种基膜的不同性质及其对TFC膜性能的影响。结果表明，亲水性更强、膜孔位置分布更密集且均匀、孔径更均一的基膜具有更高的水通量和更低的反向盐质通量。此外，基于两种基膜的TFC正渗透膜的水通量均随沥干时间的拉长而呈现不断降低的趋势，而反向盐通量始终保持较低水平。综上，本研究可为未来TFC膜的规范化制备提供技术支持。

Thin film composite (TFC) membranes, which consist of a porous substrate and a polyamide layer generated by interfacial polymerization (IP) reaction, have been widely used in the fields of nanofiltration, reverse osmosis and forward osmosis (FO). Recently, the influence of substrate properties on the performance of TFC membranes has received increasing attention. Our early study found that even under the conditions of identical preparation methods and nominal pore sizes of the substrate membranes, there were significant differences in the TFC membranes prepared from substrate membranes produced by different manufacturers. In this paper, commercial polyethersulfone (PES) membranes with nominal pore size of 0.22 μm from two companies were selected as the substrate, and the different properties of the two substrate membranes and their effects on the performance of TFC membranes were comparatively studied by adjusting the draining time of the aqueous phase in the IP process. The results showed that the substrate membrane with stronger hydrophilicity, denser and more uniform distribution of membrane pore locations, and more homogeneous pore size had higher water flux and lower reverse salt flux. In addition, the water flux of TFC FO membranes based on both substrate membranes showed a decreasing trend with the elongation of the draining time, while the reverse salt flux always remained low. In conclusion, this study provides a reference for the standardized preparation of TFC membranes in the future.

基金项目：

国家自然科学基金青年项目（52100089）

作者简介：

许素博（2000-），男，山东菏泽人，硕士生，主要从事膜法水处理技术研究，E-mail：xu17159877560@163.com

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