PVDF-TiO_2复合中空纤维膜的制备与表征  

Preparation and Characterization of PVDF-TiO_2 Composite Hollow Fiber Membrane

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

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：《化学工业与工程》2013年第6期5-10,共6页Chemical Industry and Engineering

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;2012-T7)

摘　　要：将纳米二氧化钛(TiO2)粒子与4类制膜添加剂复配处理,采用相转化法制备聚偏氟乙烯(PVDF)-TiO2复合中空纤维膜,讨论了纳米TiO2粒子对复合膜结构和性能的影响。通过扫描电子显微镜、X射线衍射、能谱分析、热重分析、拉伸试验、接触角测定和超滤实验分别表征了复合膜的微观孔结构、晶相结构和复合均匀性、热稳定性、机械性能、亲水性、超滤性能以及抗污染性能。结果表明:通过添加TiO2粒子复配添加剂,复合膜的性能得到有效改善。复配添加剂中w(TiO2)为2%(占PVDF固含量的质量分数)时,纯水通量由348 L/(m2·h)提高至377 L/(m2·h),牛血清蛋白截留率由68%提高至90%,断裂强度和抗污染性能提高,复合膜综合性能优异。Blending modification of PVDF membrane is the most efficient way which can be applied to an industrial scale production. The incorporation of inorganic nanoparticles has been extensively studied due to its simplicity. Poly（vinylidene fluoride） （PVDF）-titania （TiO2） composite hollow fiber membranes were prepared by phase inversion process. The microstructure, crystalline phase, uniformity, thermal stability, mechanical strength, hydrophilicity, ultrafiltration performance and antifouling ability of the membranes were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, energy dispersion of X-ray （EDX）, thermo gravimetric analysis （TGA）, mechanical property test, contact angle measurement and ultrafiltration （UF） experiment, respectively. Compared to the pure PVDF membrane, the performances of composite membranes were improved greatly. When the mass fraction of TiO2 was 2% （by weight of PVDF）, pure water flux increased from 348 L/（m2·h） of the PVDF membrane to 377 L/（m2·h）,rejection of bovine serum albumin （BSA） increased from 68% to 90%. Moreover, mechanical property, hydrophilicity and antifouling property were enhanced effectively.

关 键 词：纳米二氧化钛 复合中空纤维膜 PVDF 相转化 

分 类 号：TQ028.8[化学工程]