Surface modification of thin film composite polyamide membranes by electrostatic self deposition of polycations for improved fouling resistance
Surface modification of thin film composite polyamide membranes by electrostatic self deposition of polycations for improved fouling resistance
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DOI：
10.1016/j.seppur.2008.12.021
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发表时间：
2009-04
影响因子：
8.6
通讯作者：
Yong Zhou;Sanchuan Yu;Cong-jie Gao;Xian-she Feng
中科院分区：
文献类型：
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作者：
Yong Zhou;Sanchuan Yu;Cong-jie Gao;Xian-she Feng
采用静电自组装法对界面聚合聚酰胺薄膜复合膜进行改性，改性后的膜具有较好的抗静电性能。由于聚乙烯亚胺层的应用，在膜表面上的电荷反转被示出，以增加膜的耐阳离子污垢性，因为增强的静电排斥，并且增加的表面亲水性将有助于最小化通量降低。涉及膜表面改性的参数的影响（例如，聚乙烯亚胺浓度和沉积时间）对膜性能的影响。膜改性被发现增加盐截留率时，MgCl2和NaCl进行了测试。还研究了在存在和不存在十二烷基三甲基溴化铵（其是废水中存在的常见阳离子表面活性剂）的情况下膜的结垢行为。结果表明，虽然沉积的聚乙烯亚胺表面层倾向于提供额外的抗渗透性，但改善的抗污染性和增加的表面亲水性补偿了由于聚乙烯亚胺层的沉积而导致的膜渗透性的降低。
Interfacially polymerized polyamide thin film composite membrane was modified by electrostatic self-assembly of polyethyleneimine on the membrane surface, and the modified membrane showed significantly improved antifouling properties. The charge reversal on the membrane surface due to the application of the polyethyleneimine layer was shown to increase the fouling resistance of the membrane to cationic foulants because of the enhanced electrostatic repulsion, and the increased surface hydrophilicity would help minimize the flux reduction. The effects of parameters involved in the membrane surface modification (e.g., polyethyleneimine concentration and deposition time) on the membrane performance were investigated in terms of water permeation flux and salt rejection. The membrane modification was found to increase salt rejections when MgCl2and NaCl were tested. The fouling behavior of the membranes was also studied with and without the presence of dodecyltrimethylammonium bromide (which is a common cationic surfactant present in waste water). It was shown that while the deposited polyethyleneimine surface layer tended to offer additional resistance to permeation, the improved fouling resistance and the increased surface hydrophilicity compensated for the reduction in membrane permeability due to the deposition of the polyethyleneimine layer.