凝固浴组分对双凝固浴法制备PVDF膜结构和性能的影响  

Effect of coagulation bath composition on the structures and properties of PVDF membrane formed by a dual-bath coagulation method

作　　者：王磊[1] 李薇[1] 王旭东[1] 孟晓荣[2] 原巍[2] 黄丹曦[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]西安建筑科技大学理学院,西安710055

出　　处：《膜科学与技术》2012年第2期5-9,共5页Membrane Science and Technology

基　　金：教育部博士点基金项目-博导类(20096120110010);国家自然科学基金项目(51008243);陕西省"13115"科技创新工程重大科技专项(2010ZDKG-56);陕西省重点实验室项目(2010JS028);西部建筑科技国家重点实验室(筹)开放研究基金(10KF08)

摘　　要：在内外凝胶浴中添加不同含量的溶剂,采用双凝固浴法制备了PVDF/PVP/DMAc中空纤维膜.通过膜形貌扫描电镜(SEM)表征,纯水水通量和牛血清蛋白(BSA)截留率测试实验,分析评价了凝固浴中溶剂含量对PVDF中空纤维膜结构与性能的影响.结果表明,凝固浴中溶剂含量增大会导致皮层孔隙率增多,而对亚层结构的影响各不相同.膜的纯水渗透通量变化无明显规律性,但BSA截留率保持相对稳定.当内外凝固浴中溶剂体积分数分别为30%和70%时,膜内部大孔发育良好,亚层疏松多孔,水通量分别为270L/(m2.h)和548L/(m2.h),显示了良好的渗透性能.Polyvinylidene fluoride（PVDF）/ polyvinylpyrrolidone（PVP）/N,N-dimethylacetamide（DMAc） solutions composite hollow fiber membrane were fabricated by the dual-bath coagulation method,using different content of DMAc/water solution as the first and internal coagulation bath.The effects of solvent compositions of coagulation baths on the performance and microstructure of PVDF/PVP membranes were investigated.Hollow fiber membranes were characterized in terms of scanning electron microscopy（SEM）,pure water flux and bovine serum albumin（BSA） solute rejection performance.The results indicated that,as DMAc in the coagulations increased,the pores at the top layer significantly increased,while the sub-layer structure varied differently.Pure water flux of the membrane did not present regularity obviously,but the BSA rejection rate remained relatively stable.When the volume fraction of DMAc solutions in the first and internal coagulant were up to 70% and 30%,the macrovoid structure at the sub-layer were large and loose.It was also found that the pure water flux of the PVDF membranes amounted to 548 L/（m2·h） and 270 L/（m2·h）,which showed a good permeability.

关 键 词：中空纤维膜 PVDF 双凝固浴法 凝固浴组分 

分 类 号：TB383.2[一般工业技术—材料科学与工程]