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Preparation of Nanofiltration Membrane Based on Cross-linked Modification of Regenerated Cellulose and Its Study on Inorganic Salt Retention Performance
  
DOI：10.11980/j.issn.0254-508X.2018.03.001
Key Words:cellulose regenerated membrane  nanofiltration membrane  sodium alginate  carboxymethyl cellulose  epichlorohydrin
Fund Project:福建省发改委科技重大专项（闽发改高技［2014］514号）；福建省科技厅高校产学合作项目（2016H6004）。
Author NameAffiliation
LI Shi Center for Advanced Bio-based Functional Materials，Fujian Agriculture and Forestry University， Fuzhou， Fujian Provice， 350002 
CHENG Yu-tong Center for Advanced Bio-based Functional Materials，Fujian Agriculture and Forestry University， Fuzhou， Fujian Provice， 350002 
HUANG Fang Center for Advanced Bio-based Functional Materials，Fujian Agriculture and Forestry University， Fuzhou， Fujian Provice， 350002 
LIN Shan Center for Advanced Bio-based Functional Materials，Fujian Agriculture and Forestry University， Fuzhou， Fujian Provice， 350002 
MA Xiao-juan Center for Advanced Bio-based Functional Materials，Fujian Agriculture and Forestry University， Fuzhou， Fujian Provice， 350002 
CAO Shi-lin Center for Advanced Bio-based Functional Materials，Fujian Agriculture and Forestry University， Fuzhou， Fujian Provice， 350002 
CHEN Li-hui Center for Advanced Bio-based Functional Materials，Fujian Agriculture and Forestry University， Fuzhou， Fujian Provice， 350002 
HUANG Liu-lian* Center for Advanced Bio-based Functional Materials，Fujian Agriculture and Forestry University， Fuzhou， Fujian Provice， 350002 
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Abstract:The regenerated bamboo cellulose membrane(BCM） was used as base film， sodium alginate(ALG） and carboxymethyl cellulose(CMC） were applied as the active layer coating solution， and the epichlorohydrin(ECH） was used as cross-linking agent to prepare a bamboo cellulose based nanofiltration membrane(CL-NF-BCM） by cross-linking methodin the study. The membrane preparation process and the retention performances of different salts， such as NaCl， Na2SO4， MgCl2， MgSO4 and CaCl2(500 ppm） were investigated. The results showed that the water flux of the CL-NF-BCM was 13.75 L/（m2 · h） and the NaCl retention rate was 48.15% when the concentration of the mixed coating solution of sodium alginate and carboxymethyl cellulose(mix ratio=1∶3） was 2.0%， and the concentration of epichlorohydrin was 3.0%.The water flux of BCM was 487.81 L/（m2 ·h）， which was significantly higher than CL-NF-BCM， while the rejection of the salt in CL-NF-BCM was significantly higher than BCM， i.e.1.52%. The retention order of the salts was: Na2SO4> MgSO4>NaCl> MgCl2> CaCl2. The tensile strength of the cellulose membrane was 46.65 N， the tensile strength of the cross-linked nanofiltration membrane was 83.31 N， increased 44.0%， and the cross-linked composite nanofiltration membrane elongation was 4.7 mm， the rate of elongation was 9.40%， indicating its mechanical performance increased compared with BCM．
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