具有褶皱结构抗污染分离膜的制备与性能探索

Preparation and performance exploration of anti-pollution separation membranes with fold structure

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/(m^(2)·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/(m^(2)·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.