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Performances of PDDA/CMCNa-PAN composite nanofiltration membrane prepared by self-assembly method

Authors： DU Ziang1，QIN Zhenping1，GUO Hongxia2*，WANG Naixin1, ZHANG Guojun1，JI Shulan1

Units： 1. College of Environnental and Energy Engineering ，2. College of Materials Science and Engineering，Beijing University of Technology，Beijing 100124，China

KeyWords： carboxymethyl cellulose sodium(CMCNa)；composite nanofiltration membrane；layer-by-layer self-assembly；charge property；hydrophilicity；rhodamine B

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2015,35(1):64-69

Abstract：

In this work, (PDDA/CMCNa)n-PAN composite NF membrane has been fabricated by layer-by-layer electrostatic self-assembly technology on PAN ultrafiltration membrane substrate, using negatively charged carboxymethyl cellulose sodium as anionic polyelectrolyte and PDDA as cationic polyelectrolyte. The variation of surface morphologies, ζ potential values and contact wetting angle with each deposited layer as well as the nanofiltration performance on dyeing solution of rhodamine B were investigated. The results indicated that the membrane surface showed more negatively charged and hydrophilic with increase of CMCNa anionic polyelectrolyte concentration. The ζ potential and the contact wetting angle of the membrane with 4.0 bi-layers was -70mV and 30°, respectively, when 5.0g/L of PDDA and 2.0g/L of CMCNa was self-assembled. The rejection of 0.4×10-3g/L of rhodamine B was more than 90% with flux of 42 L·m-2·h-1·MPa-1 at 25℃ and 0.60MPa pressure.

Funds：

国家自然科学基金项目（21176005）；北京市自然科学基金（8122010）

AuthorIntro：

杜子昂（1988-），女，河北石家庄人，硕士研究生，研究方向为膜科学与化工分离技术;

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