电中性纳滤膜的制备及其染料脱盐和抗污染性能研究  

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

作　　者：郭灵艺 谢锐[1] 巨晓洁[1] 汪伟[1] 刘壮[1] 褚良银[1] GUO Lingyi;XIE Rui;JU Xiaojie;WANG Wei;LIU Zhuang;CHU Liangyin(School of Chemical Engineering,Sichuan University,Chengdu 610065)

机构地区：[1]四川大学化学工程学院,成都610065

出　　处：《膜科学与技术》2022年第6期134-143,167,共11页Membrane Science and Technology

基　　金：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)。

摘　　要：以硫酸铜/过氧化氢(CuSO_(4)/H_(2)O_(2))为触发剂,利用多巴胺(DA)辅助磺酸基甜菜碱(SBMA)和聚乙烯亚胺(PEI)快速沉积改性聚丙烯腈(PAN)超滤膜制备了具有电中性表面的纳滤膜(PAN-DPS).系统研究了SBMA和PEI的投料比对PAN-DPS膜的微观结构、化学组成、表面浸润性和荷电性的影响,并考察了膜的染料/盐分离及抗牛血清白蛋白(BSA)污染性能.结果表明,投料比为10∶1的纳滤膜表面沉积了最多的DA和SBMA聚集体,功能层厚度高达636 nm,表面水接触角低至33.2°,等电点约为pH 7.2.其纯水渗透率为156 L/(m^(2)·h·MPa),对甲基蓝的截留率为99.2%,对NaCl、Na_(2)SO_(4)和MgCl_(2)的截留率分别为3.4%、5.4%和8.5%.在1 mg/mL的BSA溶液中的静态吸附量为7.0μg/cm^(2),过滤BSA溶液3次后的纯水恢复率仍能够达到88.5%,表现出良好的染料脱盐和抗污染性能.上述研究结果为抗污染的染料脱盐纳滤膜的制备提供了一种新思路.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(CuSO_(4)/H_(2)O_(2))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 33.2°,and an isoelectric point of about pH 7.2.The pure water flux across the membrane was 156 L/(m^(2)·h·MPa),the rejection of methyl blue was 99.2%,and the rejection of NaCl,Na2SO4and MgCl2were 3.4%,5.4%and 8.5%,respectively.The static adsorption amount of BSA on this membrane in 1 mg/mL BSA solution was 7.0μg/cm^(2),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.

关 键 词：两性离子液体 电中性 纳滤膜 染料脱盐 抗污染 

分 类 号：TQ028.8[化学工程]