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Effect of surface porosity of support membrane on structure and performance of polyamide composite nanofiltration membrane

Authors： GAO Mantong, WANG Shenghuan, LIU Jiqiao, HE Benqiao

Units： State Key Laboratory of Separation Membranes and Membrane Process, School of Material Science and Engineering, Tiangong University, Tianjin 300387, China

KeyWords： composite NF membrane, PES ultrafiltration membrane, high surface porosity, separation performance

ClassificationCode：TQ051.893

year,volume(issue):pagination： 2022,42(5):64-69

Abstract：

A series of polyethersulfone (PES) membranes with similar surface pore size（8.29 - 9.20 nm） but five times difference in surface porosity were prepared through in-situ nano bubble assisted non-solvent induced phase separation (BNIPS) method. The PES membranes were employed as supporting membranes to prepare nanofiltration (NF) membranes by interfacial polymerization. The effects of surface porosity on the structure and separation performance of NF membrane were investigated. The results show that with the increase of the surface porosity of the supporting membrane, the polyamide layer thickness of the NF membrane decreases; the hydrophilicity increased; the negative Zeta potential on the membrane surface decreased. Compared with the control, the water permeance of the NF membrane was increased by 2.7 times, and the rejection of inorganic salts was also improved. This was because the supporting membrane with higher porosity and more uniform pore size distribution was conducive to the uniform distribution of piperazine solution on its surface during interfacial polymerization, so as to form a thinner and more uniform polyamide separation layer, which significantly improved the separation performance of nanofiltration membrane. At the same time, the high porosity on the surface of the support membrane was also conducive to reducing the lateral resistance of water flow.

Funds：

国家自然科学基金项目（22178268、21776218）；天津市科技计划支持（21ZYJDSN00130）

AuthorIntro：

高蔓彤（1997－），女，甘肃酒泉人，硕士研究生，主要研究方向为聚合物分离膜制备；E-mail：13512212508@139.com

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