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Polyhydroxy monomers modulate the structure of the separation layer to prepare high-performance nanofiltration membranes for water purification

Authors： LU Yiwen1,2, LYU Xiaolong1,2, REN Kai1,2, CHEN Xiangshang1, ZHANG Huiying1,2, LIU Huili1, WANG Chenyu1,2

Units： 1. State Key Laboratory of Separation Membrane and Membrane Process, School of Material Science and Engineering, Institute of Biological and Chemical Engineering, Tiangong University, 2. State Key Laboratory of Membrane Materials and Membrane Applications, Tianjin Membrane Technology Co., Ltd.

KeyWords： nanofiltration; BIS-TRIS; drinking water treatment; removal of micropollutants; regulation of membrane pore size

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2024,44(5):108-116

Abstract：

In order to prepare a nanofiltration membrane for efficient purification of micropollutants in water, in this study, a small molecule of polyhydroxyl second monomer bis(2-ydroxyethyl)amino(trimethyl)methane (BIS-TRIS) was mixed into piperazine (PIP) aqueous solution, and the two were polymerized with homobenzesulfyl chloride (TMC) at the same time. Fourier transform infrared spectroscopy and zeta potential were used to study the chemical structure and surface chargeability of the membrane, and the separation performance and antifouling performance of the membrane were characterized. The results showed that compared with the polyamide membranes prepared by pure PIP and TMC, the addition of BIS-TRIS increased the pore size distribution of the membrane from 0.3~0.9 nm to 0.4~1.0 nm, the molecular weight cutoff of the film from 223 to 267, and the permeation flux from 93.6 to 220 L/(m2·h·MPa), the rejection rate of Na2SO4 increased from 95.6% to 98%, and the rejection rate of tetracycline hydrochloride increased from 94% to 98.4%, and the antifouling performance of the membrane was further improved. In this study, it was proposed to use the competitive crosslinking of hydroxyl groups, amino groups and TMCs in the aqueous solution to regulate the structure of the separation layer, which provided a convenient strategy for the preparation of nanofiltration membranes for the efficient removal of micropollutants in water.

Funds：

国家重点研发计划“高端功能与智能材料”重点专项（2023YFB3810500）

AuthorIntro：

鲁艺文（1998-），女，河南商丘人，硕士生，从事纳滤膜制备.*通讯作者，E-mail：13920286131@163.com

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