脱硫用PVDF膜的结构调控与性能研究  

Research on the structure control and performance of PVDF membrane for desulfurization application

作　　者：李涵[1,2] 叶卉[1,2] 王艳兵[1,2] 张玉忠[1,2] 李泓[1,2] 陈颖[3] 

机构地区：[1]天津工业大学材料科学与工程学院,天津300387 [2]天津工业大学中空纤维膜材料与膜过程省部共建国家重点实验室培育基地,天津300387 [3]国家海洋局天津海水淡化与综合利用研究所,天津300192

出　　处：《膜科学与技术》2015年第1期35-41,共7页Membrane Science and Technology

基　　金：国家自然科学基金(50973083;51173132);2013海洋公益专项项目(201305004-5);中空纤维膜材料与膜过程省部共建国家重点实验室培育基地开放课题

摘　　要：以聚偏氟乙烯(PVDF)为膜材料,二甲基乙酰胺(DMAc)为溶剂,采用浸没沉淀相转化法制膜,研究了亲/疏水性的添加剂对PVDF膜结构、接触角及气通量的影响;采用含氟表面活性剂Zonyl 8740对PVDF膜进行疏水改性,通过ATR-FTIR、FE-SEM、接触角等对膜表征,并进行脱硫性能评价.结果表明,疏水性添加剂使PVDF膜表面水接触角提高,添加剂种类对膜气通量有明显影响,在20℃、0.01 MPa实验条件下,PVDF膜最大气通量为85.6m3/(m2·h),Zonyl 8740涂覆改性后PVDF膜表面疏水性提高,水接触角可达到133.5°,二氧化硫脱除率可达到81.3%.The polyvinylidene fluoride （PVDF） membranes have been prepared by phase inversion method with dimethylacetamide （DMAc） as solvent. The effects of hydrophilic/hydrophobic additives on the membrane structure, contact angle and gas permeability were investigated. By coating fluorine-containing surfactant Zonyl 8740, the PVDF membranes were modified to obtain hydrophobic surface. ATR-FTIR, FE-SEM and contact angle on membranes were characterized, and the corresponding desulfurization performance was evaluated. The results showed that the additive improved the water contact angle and hydrophobic performance of the membrane. The additive type had obvious influence on the gas permeability of membranes, and the max ventilation property of PVDF membrane come to 85.6 m3/（m^2 · h） under 20 ℃ and 0. 01 MPa. Through Zonyl 8740 modification, the PVDF membranes showed excellent hydrophobicity, and the water contact angle was 133.5° with 81.3% of sulfur dioxide removal efficiency.

关 键 词：PVDF Zonyl 8740 膜接触器 脱硫 

分 类 号：TQ317[化学工程—高聚物工业] TQ051.893