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Preparation of PDADMAC/PSS Nanofiltration Membrane by Layer-by –Layer Self-Assembly Technology

Authors： WANG Zongwen, SU Baowei, Gao Xueli, HAN Shanshan and GAO Congjie

Units： Key Laboratory of Marine Chemistry Theory and Technology , Ministry of Education; College of Chem & Chem.Eng, Ocean University of China, Qingdao China, 266100

KeyWords： layer-by-layer self-assembly; nanofiltration; charge property; separation performance; hydrophilic property

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2012,32(1):27-32

Abstract：

Using negatively charged PES ultrafiltration membrane as substrate, multilayer PDADMAC/PSS polyelectrolytes nanofiltration membranes were prepared by layer-by-layer self-assembly technology. The membrane surface morphology, charging property, as well as the effect of concentration and types of the support electrolyte on the membrane performance were investigated. The results indicated that the prepared NF membrane surface was uniform and with no defect; the values of negative charge on membrane surface first gradually increase with the bi-layer number, and then gradually decrease with the bi-layer number, which demonstrate that there should be an optimal concentration of the support electrolyte. In addition, the performance of the (PDADMAC/PSS)5 NF membranes prepared in optimal conditions was evaluated. The results showed that under 1.0 MPa, the Na2SO4 (2 g/L) rejection was 93%, and corresponding the flux was up to 60 L/m2h; the NaCl rejection was only 9~13%, while the flux could reach 80 L/m2h. The prepared NF membrane could be completely used for the separation of univalent and bivalent salt solution system. The variation of contact angles reflect the alternative self-assembly of the polyelectrylytes. The prepared NF membranes with PSS as surface layer have excellent hydrophilic property.

Funds：

国家自然科学基金资助项目（编号：20976170）

AuthorIntro：

王宗文（1985~），山东济南人，硕士研究生，研究方向：纳滤膜分离技术。* 通讯联系人：苏保卫，subaowei@ouc.edu.cn

Reference：

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