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以无纺布增强具有耐溶剂、耐热特性的聚醚酰亚胺(PEI)超滤(UF)膜为支撑层,具有荷正电性和良好成膜性的2-羟丙基三甲基氯化铵壳聚糖(HACC)为功能层,制备了一种荷正电HACC/PEI复合纳滤(NF)膜。考察了聚合物浓度、反应时间、交联剂浓度及交联温度等对所制备的复合纳滤膜性能的影响,并利用扫描电镜(SEM)观察了该复合纳滤膜的表面形貌。结果表明:最佳制备条件下得到的HACC/PEI复合纳滤膜在0.3 MPa、20℃下对MgCl2具有较好的分离效果,其通量和截留率分别为10.9 L/(m2·h)和83.1%;另外,HACC/PEI复合纳滤膜呈现典型的荷正电特征,对二价无机盐具有较高的截留率。
Polyethyleneimine (PEI) ultrafiltration (UF) membrane with solvent-resistant and heat-resistant properties was used as the support layer for the non-woven fabric, and 2-hydroxypropyltrimethyl Ammonium chloride chitosan (HACC) as a functional layer, prepared a positive charge HACC / PEI composite nanofiltration (NF) membrane. The effects of polymer concentration, reaction time, crosslinking agent concentration and cross-linking temperature on the properties of the prepared composite nanofiltration membranes were investigated. The surface morphology of the composite nanofiltration membranes was observed by scanning electron microscopy (SEM). The results showed that HACC / PEI composite nanofiltration membrane obtained under the best preparation conditions had good separation effect on MgCl2 at 0.3 MPa and 20 ℃, and its flux and rejection rate were 10.9 L / (m2 · h) and 83.1%. In addition, the HACC / PEI composite nanofiltration membrane exhibits typical positive charge characteristics and high rejection rate for divalent inorganic salts.