纳米TiO_2复配添加剂对PVDF中空纤维膜结构和性能的影响  

Influence on Structure and Performance for PVDF Hollow Fiber Membrane with Combined Additives of Nanoscale TiO_2

作　　者：郭春刚[1] 张召才[1] 李雪梅[1] 李浩[1] 李晓明[1] 刘国昌[1] 吕经烈[1,2] 

机构地区：[1]国家海洋局天津海水淡化与综合利用研究所,天津300192 [2]国家海水利用工程技术研究中心,天津300192

出　　处：《净水技术》2013年第4期67-71,共5页Water Purification Technology

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(G2010-13;2011-T03)

摘　　要：该文将纳米二氧化钛(TiO2)粒子与高分子致孔剂、非溶剂、表面活性剂和无机盐4类制膜添加剂复配处理,采用浸没沉淀相转化法制备聚偏氟乙烯(PVDF)-TiO2复合中空纤维膜。通过扫描电子显微镜、X射线衍射、能谱、拉伸试验、接触角测定和截留试验分别对复合膜的微观孔结构、晶相结构、Ti元素分布、机械性能、亲水性、过滤性能和抗污染性能进行了表征,讨论了纳米TiO2粒子对PVDF膜结构和性能的影响。结果表明通过改变复配添加剂中TiO2粒子的含量,可以有效调控复合膜的结构和性能。当复配添加剂中w(TiO2)为2%(占PVDF固含量的质量分数w%)时,纯水通量由216 L/m2.h提高至402 L/m2.h,牛血清蛋白截留率由95%降低至90%,复合膜整体性能较为优异。Blending modification of PVDF membrane is the most practical way which can be applied to an industrial scale pro- duction. The incorporation of inorganic nanoparticles has been extensively studied due to its simplicity. The pore-forming agent of polymer, the non-solvent, the surface active agent and inorganic salt were used as another four kinds of additives. Poly （vinylidene fluoride） （PVDF）-titania （TiO2） composite hollow fiber membranes were prepared by phase inversion process. The micro structure, chemical composition, thermal stability, mechanical strength, hydrophilicity, separation performance and antifouling ability of the membranes were investigated respectively by scanning electron microscopy （SEM）, energy dispersion of X-ray （EDX）, X-ray diffrac- tion （XRD）, thermo gravimetric analysis （TGA）, mechanical property test, contact angle measurement and rejection experiment. The results show when the mass fraction of TiO2 is 2 % （by weight of PVDF）, pure water flux increases from 216 L/mE＇h of the PVDF membrane to 402 L/m2· h, rejection of bovine serum albumin （BSA） decreases from 95 % to 90 %. The overall performance of com- posite membranes is improved compared to the pure PVDF membrane.

关 键 词：纳米 复合中空纤维膜 PVDF 相转化 

分 类 号：TQ028.8[化学工程]