膜科学与技术

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ClassificationCode：TQ028.8

year,volume(issue):pagination： 2020,40(1):139-147

Abstract：

Nanofiltration (NF) membranes are currently prepared by interfacial polymerization. Layer-by-layer (LBL) self-assembly is a new type of method developed in recent years. However, most of the NF membranes prepared by LBL self-assembly require more than 5 double layers. The preparation process is cumbersome. Meanwhile, as the anionic and cationic polyelectrolytes combined by electrostatic force, they would dissociate to a certain degree and swell in the water, and thus the self-assembled membrane is unstable. In this work, a combination of electrostatic assembly and chemical crosslinking is adopted to prepare NF membrane with enhanced stability. Using modified polyacrylonitrile (PAN) membrane as substrate, polyacrylic acid (PAA) and polyethyleneimine (PEI) as the anion-cation polyelectrolyte, and glutaraldehyde (GA) as the cross-linking agent, a kind of covalent LBL self-assembled NF membrane (PEI/PAA/GA)n was prepared. The effects of fabrication factors such as number of double layer, concentration of crosslinker and crosslinking time on the separation performance of the prepared LBL membranes were investigated. The results show that the only two bilayers’ LBL membrane, (PEI/PAA/GA)2, can achieve a rejection of 98.1% for divalent ions and a flux of 12.6 L m−2 h−1 MPa−1.The crosslinked LBL NF membrane has good swelling resistance and long-term running stability.

Funds：

国家自然科学基金项目（No. 20976170）

AuthorIntro：

第一作者简介：张金苗（1994-），女，山东青岛人，硕士研究生，研究方向：膜分离技术，E-mail: zhangjinmiao123@126.com；贾瑞（1989-），女，河南商丘人，硕士研究生，为共同第一作者。*通讯作者，E-mail: subaowei@ouc.edu.cn

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