李诗程 雨桐黄 方林珊 马晓娟 曹石林 陈礼辉 黄六莲

摘要：以竹纖维素再生膜为基膜，海藻酸钠和羧甲基纤维素的共混溶液为涂覆液，环氧氯丙烷为交联剂，采用交联法制备了一种新型纤维素复合纳滤膜。研究了纳滤膜的制备工艺和对NaCl、Na2SO4、MgCl2、MgSO4、CaCl2（500 mg/L）的截留性能。结果表明，在海藻酸钠与羧甲基纤维素共混溶液质量分数20%、共混比1∶3、环氧氯丙烷质量分数30%条件下，纤维素复合纳滤膜的膜通量为1375 L/（m2·h），NaCl截留率为4815%，较纤维素再生膜的膜通量（48781 L/（m2·h））下降明显，较纤维素再生膜的截留率（152%）有明显提高。对几种无机盐的截留性能顺序为：Na2SO4﹥MgSO4﹥NaCl﹥MgCl2﹥CaCl2。相比纤维素再生膜，纤维素复合纳滤膜的抗张力为8331 N，比纤维素再生膜的抗张力（4665 N）提高了440%，膜伸长量47 mm，伸长率940%，抗张强度5554 kN/m，机械性能相对提高。

关键词：纤维素再生膜；纤维素复合纳滤膜；海藻酸钠；羧甲基纤维素；环氧氯丙烷

中图分类号：TQ3537文献标识码：ADOI：1011980/jissn0254508X201803001

收稿日期：20171102（修改稿）

基金项目：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）。

*通信作者：黄六莲，教授；主要研究方向：清洁制浆技术的研究，植物纤维化学与材料。Preparation of Nanofiltration Membrane Based on Crosslinked Modification

of Regenerated Cellulose and Its Study on Inorganic Salt Retention PerformanceLI ShiCHENG YutongHUANG FangLIN ShanMA XiaojuanCAO ShilinCHEN LihuiHUANG Liulian*

（Center for Advanced Biobased Functional Materials， Fujian Agriculture and Forestry University， Fuzhou， Fujian Provice， 350002）

（*Email： hll65212@163com）

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 crosslinking agent to prepare a bamboo cellulose based nanofiltration membrane（CLNFBCM） by crosslinking methodin the study The membrane preparation process and the retention performances of different salts， such as NaCl， Na2SO4， MgCl， MgSO4 and CaCl2（500 ppm） were investigated The results showed that the water flux of the CLNFBCM was 1375 L/（m2 · h） and the NaCl retention rate was 4815% when the concentration of the mixed coating solution of sodium alginate and carboxymethyl cellulose（mix ratio=1∶3） was 20%， and the concentration of epichlorohydrinwas 30%The water flux of BCM was 48781 L/（m2 ·h）， which was significantly higher than CLNFBCM， while the rejection of the salt in CLNFBCM was significantly higher than BCM， ie152% The retention order of the salts was： Na2SO4> MgSO4>NaCl> MgCl2> CaCl2 The tensile strength of the cellulose membrane was 4665 N， the tensile strength of the crosslinked nanofiltration membrane was 8331 N， increased 440%， and the crosslinked composite nanofiltration membrane elongation was 47 mm， the rate of elongation was 940%， indicating its mechanical performance increased compared with BCM.

Key words：cellulose regenerated membrane； nanofiltration membrane； sodium alginate； carboxymethyl cellulose； epichlorohydrin

纤维素是自然界中广泛存在的数量最多的可降解再生天然物质。相关统计表明，全球每年利用生物合成的纤维高达数千亿吨。与石油等矿物资源相比，纤维素表现出了良好的环境友好性[12]。

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