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Preparation of CEL/CS blend nanofiltration membranes for dye desalination

Authors： CHEN Huijuan1, JI Xiaosheng1, CHEN Xiaoxiang2, ZHANG Lin3

Units： 1.Ocean College，Zhejiang University，Zhoushan，316021，China；2. Hangzhou Ultrafiltration & Nanofiltration Water Purification Equipment Co. Ltd，Hangzhou，311243，China；3.College of Chemical and Biological Engineering，Zhejiang University，Hangzhou，310027，China

KeyWords： cellulose; chitosan; ionic liquid; dye desalination; nanofiltration membrane

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2018,38(4):27-32

Abstract：

Cellulose is applied to prepare nanofiltration membrane successfully due to excellent mechanical stability and film-forming property. However, the bare cellulose membrane surface is negatively charged, and then it has high rejection of low molecular weight water-soluble dyes and Na2SO4, so the removal rate of Na2SO4 remains to be further improved. In this study, a weak positively charged CEL/CS blend NF membrane was prepared successfully via phase inversion method using cellulose and chitosan as membrane materials, ionic liquid 1-ethyl-3-methyl-imidazolium acetate (EMIMAc) and DMSO as solvents, water as coagulation bath on a non-woven fabric substrate. The results showed that the prepared blend nanofiltration membrane had the best separation performance when the mass ratio of cellulose to chitosan was 1:1. The membrane had a high rejection of direct dye (congo red:99.99%) and the retention of reactive dyes were 80-90% (reactive black 5 and reactive blue 19) under the cross-flow conditions of 0.5 MPa. However, the rejection of inorganic salts were low, such as NaCl and Na2SO4 were below 10% and 1% respectively. The above results showed that the membrane enabled efficient separation of dye and salt.

Funds：

“973”计划项目（2015CB655303）

AuthorIntro：

第一作者简介：陈慧娟（1993.12-），女，安徽合肥人，硕士研究生，从事水处理纳滤膜的制备及应用，E-mail：chenhuijuan@zju.edu.cn 通讯作者，E-mail：linzhang@zju.edu.cn

Reference：

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