铸膜条件对相转化法制备PVDF微滤膜性能的影响  

EFFECTS OF CASTING CONDITIONS ON PVDF MICROFILTRATION MEMBRANE PERFORMANCE BY IMMERSION PRECIPITATION PHASE INVERSION

作　　者：张杰[1] 王巧英[1] 王志伟[1] 吴志超[1] 

机构地区：[1]同济大学环境科学与工程学院,上海200092

出　　处：《水处理技术》2013年第7期57-60,76,共5页Technology of Water Treatment

基　　金：国家科技支撑计划项目(2012BAJ21B05);上海市科委科研项目(12230707000)

摘　　要：研究了浸没沉淀相转化法制备聚偏氟乙烯(PVDF)微滤膜过程中挥发时间、凝胶浴温度、铸膜厚度和铸膜速度对成膜的形态结构、孔隙率、过滤性能以及污染性能的影响。结果表明,随挥发时间延长,成膜孔隙率变小,纯水通量先增加后减小,以10 s为挥发时间制得的膜抗污染性能最强;随凝胶浴温度的升高,孔隙率、纯水通量及抗污染性能先增大后减小,在45℃成膜污染速率最低;随铸膜厚度的增加,纯水通量逐渐减小,孔隙率呈现先增加后减小的规律,且铸膜厚度为0.25 mm时成膜抗污染性能最好。In this study,the poly（vinylidene） fluoride（PVDF）-based microfiltration membrane was prepared via immersion-precipitation phase inversion method.The effects of the preparation conditions,such as evaporation time,coagulation bath temperature,scraper clearance and casting speed on the membrane morphological structure,porosity,permeability and fouling performance were systematically investigated.The results showed that with the extending of evaporation time,the porosity decreased and pure water flux increased firstly and then decreased.The membranes prepared with 10 s as the evaporation time presented the best anti-fouling property.The porosity,pure water flux and fouling rate of the membranes increased with the initial increasing of the coagulation bath temperature,and then decreased when the coagulation bath temperature was above 45 ℃.With the increment of scraper clearance,pure water flux gradually decreased,and the porosity exhibited the tendency of increasing firstly and then decreasing.The fouling performance was optimal when the scraper clearance was 0.25 mm.

关 键 词：PVDF微滤膜 铸膜条件 浸没沉淀相转化法 膜污染 

分 类 号：TQ028.8[化学工程]