膜科学与技术

具有褶皱结构抗污染分离膜的制备与性能探索

作者：郑甜甜，杨景，李昕阳，马文松，程琦，邓雪松，辛清萍，林立刚

单位：天津工业大学材料科学与工程学院，省部共建分离膜与膜过程国家重点实验室，天津 300387

关键词：抗污染、分离膜、溶胶凝胶、褶皱

出版年,卷(期):页码： 2021,41(6):60-66

摘要：

膜与外界相互作用首先是通过膜表面进行的，表面具有特殊结构的分离膜备受关注。以聚乙烯乙烯醇共聚物(EVAL)为膜材料，通过溶胶凝胶法将正硅酸四乙酯(TEOS)引入到膜表面，制备出了具有表面褶皱结构的EVAL改性膜，对膜的分子结构、微观结构、抗污染性能、分离性能、机械性能等进行了分析和讨论。结果表明，改性膜的通量是原膜的6倍，达到384.3 L/(m2·h)，改性后，膜对BSA的截留率由75%增大到99.3%；改性膜具有良好的抗污染性能；与原膜相比，改性膜的弹性模量由7.47 MPa增加到8.57 MPa，伸长率由16.6%增加到36.6%，表现出良好的机械性能。通过所述策略得到了兼具较高分离性能、抗污染性能与机械性能的改性膜，相关研究对膜表面改性具有一定借鉴价值。

The interaction between the membrane and the outside world is first carried out through the membrane surface, and the separation membrane with a special structure on the surface has attracted much attention. Using polyethylene vinyl alcohol copolymer (EVAL) as the membrane material, tetraethylorthosilicate (TEOS) was introduced to the surface of the membrane by the sol-gel method, and an EVAL modified membrane with a wrinkled structure was prepared. The structure, microstructure, anti-pollution performance, separation performance, mechanical performance were analyzed and discussed. The results showed that the flux of the modified membrane was 6 times that of the raw membrane, reaching 384.3 L/(m2·h). After the modification, the rejection rate of the membrane to BSA increased from 75% to 99.3%; the modified membrane had a good performance. Compared with the raw membrane, the elastic modulus of the modified membrane increased from 7.47 MPa to 8.57 MPa, and the elongation increased from 16.6% to 36.6%, showing good mechanical properties. Through the strategy, a modified membrane with higher separation performance, anti-fouling performance and mechanical performance is obtained, and related research has certain reference value for membrane surface modification.

郑甜甜（1996-），女，天津人，硕士研究生，研究方向为膜分离，E-mail：zhengtiantian2021@163.com

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