膜科学与技术

两性离子纳滤膜的制备及抗污染性能研究

作者：王新乐¹，²，刘铭辉¹，²，于海军³，康国栋³，曹义鸣³，李霞⁴，付晓燕⁵

单位： 1.中海油能源发展股份有限公司北京安全环保工程技术研究院，天津 300457；2.中海油节能环保服务有限公司，天津 300457；3.中国科学院大连化学物理研究所，大连 116023；4.中原工学院，郑州 450007；5.辽宁省大连生态环境监测中心，大连 116023

关键词：纳滤膜；接枝改性；交联；抗污染

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2021,41(6):51-59

摘要：

采用K2S2O8氧化聚砜膜产生活性羟基，通过接枝-交联法将N,N-二甲基N-(2-甲基丙烯酰胺乙基)N-(3-磺丙基)铵（MPDSAH）和丙烯酰胺（AAm）聚合交联到膜表面，制备两性离子复合纳滤膜。利用ATR/FTIR、XPS、SEM和接触角测定仪对膜进行表征，并考察接枝改性溶液中MPDSAH和AAm不同比例对膜渗透分离性能和抗污染性能的影响。结果表明，经过化学接枝交联，可在聚砜膜表面形成新的分离层，而且随着接枝单体MPDSAH浓度的增加，两性离子复合纳滤膜的表面亲水性和截留能力逐渐增强，但膜通量先增加后降低；两性离子复合纳滤膜对不同无机盐的截留顺序为Na2SO4 > MgSO4 > NaCl > MgCl2；聚砜膜表面的接枝改性层稳定性好，使用过程中不易脱落。

Polysulfone membrane was oxidized by potassium persulfate to produce active hydroxyl groups. The zwitterionic nanofiltration membrane was prepared by grafting and crosslinking the MPDSAH and AAm to the membrane surface. The changes of the membrane surface before and after modification were characterized by ATR/FTIR, XPS, SEM and Contact angle measurement. The effects of different proportions of MPDSAH and AAM in grafted solution on the permeation separation performance and antifouling performance of the membrane were investigated. The results showed that a new separation layer could be formed on the surface of the polysulfone membrane through chemical grafting and crosslinking. The surface hydrophilicity and rejection rate of the zwitterionic nanofiltration membrane gradually increased with the concentration of grafted monomer MPDSAH, but the flux firstly increased then decreased. The rejection order of different inorganic salts by the zwitterionic nanofiltration membrane was Na2SO4 > MgSO4 > NaCl > MgCl2. The grafted layer on the surface of the polysulfone membrane was stable and not easy to fall off during use.

基金项目：

海油发展科技项目“高性能膜法油水分离技术”（HFKJ-CGXM-AQ-2020-01）；大连市科技创新基金应用基础研究项目“新型碟管式反渗透膜组件研发”（2019J12SN67）；辽宁省自然科学基金“新型油水分离膜的制备与应用基础研究”（2019-MS-313）；

作者简介：

王新乐（1989-），男，山东聊城人，工程师，硕士，主要从事工业废水膜处理技术研究.

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