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仿蜘蛛网结构油水分离膜的制备和性能探索

作者：汪祺，邓雪松，郑甜甜，高祎欣，程琦，杨景，强荣荣，李昕阳，马文松，林立刚，张玉忠

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：水凝胶；膜分离；油水分离；仿生；改性

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2021,41(2):9-17

摘要：

具有三维网络结构和亲水特性的水凝胶用于分离膜改性备受关注.本文以聚偏氟乙烯（PVDF）膜为基质，将羧甲基纤维素（CMC）通过自交联方式引入膜表面，制备了仿蜘蛛网结构的CMC-PVDF改性膜，对膜的油水分离性能、抗污染性能、机械性能等进行了考察.结果表明，相对于原膜，改性膜的油水乳液通量增加了4倍，达到612 L/(m2·h），油水分离性能从74％提高到94％以上；改性膜具有较好的抗污染能力；相对于原膜，CMC-PVDF改性膜的弹性模量从3.647 MPa提高到了14.86 MPa，伸长率从31.5%提高到了58.4%，这与膜表面的仿蜘蛛网结构有关.通过本研究所述方法得到了兼具较高分离性能、抗污染性能和机械性能的膜材料，对分离膜改性研究具有一定借鉴价值.

Hydrogels with three-dimensional network structure and hydrophilic properties have attracted much attention for the modification of separation membranes. In this paper, polyvinylidene fluoride (PVDF) membrane is used as the substrate, and carboxymethyl cellulose (CMC) is introduced into the membrane surface through self-crosslinking, and a CMC-PVDF modified membrane with a spider web structure is prepared, which separates oil and water from the membrane. Performance, anti-pollution performance, mechanical performance, etc. were investigated. The results show that coMPared with the raw membrane, the oil-water emulsion flux of the modified membrane increased by 4 times to 612 L/(m2·h), and the oil-water separation performance increased from 74% to more than 94%; The modified membrane has better anti-pollution ability;CoMPared with the raw membrane, the elastic modulus of the CMC-PVDF modified membrane has increased from 3.647 MPa to 14.86 MPa, and the elongation has increased from 31.5% to 58.4%. This is related to the spider web structure on the surface of the membrane. Through the method described in this study, a modified membrane material with high separation performance, anti-fouling performance and mechanical performance was obtained, which has certain reference value for the study of separation membrane modification.

基金项目：

国家自然科学基金(22078244、21676199)，全国大学生创新训练项目（201910058007）

作者简介：

汪祺（1995-），男，浙江嵊州人，硕士研究生，主要从事分离膜的研究

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