膜科学与技术

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Electroneutral nanofiltration membrane and its dye desalination and anti-fouling performance

Authors： GUO LingYi, XIE Rui, JU Xiaojie, WANG Wei, LIU Zhuang, CHU Liangyin

Units： School of Chemical Engineering, Sichuan University, Chengdu 610065

KeyWords： Zwitterionic ionic liquid; Electroneutral; Nanofiltration membrane; Dye desalination; Anti-fouling

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(6):134-143

Abstract：

The nanofiltration membranes with electroneutral surfaces (PAN-DPS) were prepared by dopamine(DA)-assisted fast-deposition of sulfobetaine methacrylate (SBMA) and polyethyleneimine (PEI) on polyacrylonitrile (PAN) ultrafiltration membranes using copper sulfate/hydrogen peroxide (CuSO4/H2O2) as triggers. The effects of the feeding ratio of SBMA and PEI on the microstructure, chemical composition, surface wettability and charge properties of PAN-DPS membranes were systematically investigated, and the dye/salt separation and anti-fouling performance toward bovine serum albumin (BSA) of the membranes were examined. The results showed that the membrane prepared by the feeding ratio of 10:1, whose surface coated with the maximal amount of DA and SBMA aggregates, was provided with a functional layer thickness of 636 nm, a surface water contact angle of 33.2º, and an isoelectric point of about pH 7.2. The pure water flux across the membrane was 15.6 L/(m2·h·bar), the rejection of methyl blue was 99.2%, and the rejection of NaCl, Na2SO4 and MgCl2 were 3.4%, 5.4% and 8.5%, respectively. The static adsorption amount of BSA on this membrane in 1 mg/mL BSA solution was 7.0 µg/cm2, and the flux recovery ratio reached 88.5% after filtering the BSA solution for three times. The membrane exhibited a satisfactory dye desalination and anti-fouling properties. The results provide a new idea for the study of fabrication of anti-fouling nanofiltration membrane for dye desalination.

Funds：

国家自然科学基金项目(22078205);四川省杰出青年科技人才项目(2019JDJQ0026)

AuthorIntro：

郭灵艺(1996-),男 ,四川自贡人 ,硕士生 ,研究方向为膜材料与膜过程

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