2_羟丙基三甲基氯化铵壳聚糖_聚砜复合纳滤膜的制备

第40卷第6期2007年6月天津大学学报JournalofTianjinUniversityVo.l40No.6Jun.2007收稿日期:2006-07-10;修回日期:2007-01-09.基金项目:国家重点基础研究规划项目973计划(2003CB615706).作者简介:黄瑞华(1976—),女,博士研究生,huangrh20022002@yahoo.com.cn通讯作者:陈国华,ghchen@mai.ledu.ouc.cn.2-羟丙基三甲基氯化铵壳聚糖/聚砜复合纳滤膜的制备黄瑞华1,2,陈国华1,孙明昆1,高丛堦1(1.中国海洋大学化学化工学院,青岛266100;2.西北农林科技大学理学院,杨凌712100)摘要:以2-羟丙基三甲基氯化铵壳聚糖(HACC)为活性功能层,聚砜超滤膜为支撑层,以六亚甲基二异氰酸酯(HDI)为交联剂,制备了一种荷正电复合纳滤膜.探讨了HACC浓度、HDI浓度、交联温度等制备条件对膜性能的影响.通过电镜扫描对膜的结构进行了表征,显示了该膜的复合结构.复合膜的截留相对分子质量为500左右,膜孔径约为0.71nm.并且,对膜的性能进行了测试,探索了操作压力、料液浓度、料液类型等操作条件对膜性能的影响.其中,在20℃,复合膜的纯水渗透系数为13.6L/(hm2MPa);对不同无机盐的截留顺序为:MgCl2>NaCl>KCl>MgSO4>Na2SO4>K2SO4,呈现荷正电纳滤膜的特征.关键词:2-羟丙基三甲基氯化铵壳聚糖;六亚甲基二异氰酸酯;荷正电纳滤膜;膜性能中图分类号:TQ028文献标志码:A文章编号:0493-2137(2007)06-0688-06Preparationof2-HydroxypropyltrmiethylAmmoniumChlorideChitosan/Poly(Sulfone)CompositeNanofiltrationMembraneHUANGRui-hua1,2,CHENGuo-hua1,SUNMing-kun1,GAOCong-jie1(1.CollegeofChemistryandChemicalEngineering,OceanUniversityofChina,Qingdao266100,China;2.CollegeofScience,NorthwestA＆FUniversity,Yangling712100,China)Abstract:Anovelpositivelychargedcompositenanofiltration(NF)membranewaspreparedusing2-hydroxypropyltrimethylammoniumchloridechitosan(HACC)asactivefunction-layer,poly(sulfone)(PSF)UFmembraneassupportlayerandhexamethylenediisocyanate(HDI)ascross-linkingreagen.tTheeffectofpreparationconditionsonmembraneperformancewereinvestigatedsuchasHACCconcentration,HDIconcen-tration,etc.ThestructurecharacteristicsoftheresultantNFmembraneisobservedbyscanningelectronmicro-scope,revealingthecompositestructureoftheNFmembrane.Andthecut-offmolecularweightofthecompositemembraneisabout500withaporediameterof0.71nm.Additionally,theeffectofoperationconditionsonmembraneperformancewerestudiedsuchasoperatingpressure,feedconcentration,thetypeoffeed,etc.At20℃,thepermeabilityofpurewateroftheNFmembraneis13.6L/(hm2MPa).TheorderofrejectiontodifferentsaltsolutionsisMgCl2>NaCl>KCl>MgSO4>Na2SO4>K2SO4,revealingthecharacteristicsofpositivelychargedNFmembranes.Keywords:HACC;HDI;positivelychargednanofiltrationmembran