功能化TiO_2纳米管改性聚偏氟乙烯杂化膜的结构与性能  

Morphology and property of PVDF hybrid membrane modified by functionalized TiO_2 nanotubes

作　　者：宋雪[1] 文晨[1] 孙炜[1] 肖长发 

机构地区：[1]天津工业大学环境与化学工程学院,天津300160 [2]膜材料与膜过程国家重点实验室培育基地,天津300160

出　　处：《膜科学与技术》2012年第4期11-16,共6页Membrane Science and Technology

基　　金：国家自然科学基金(51073120);天津市科技计划项目(10SYSYJC27900)

摘　　要：将功能化TiO2纳米管(FTNT)均匀分散在聚偏氟乙烯(PVDF)铸膜液中,利用相转化法制备PVDF/FTNT杂化膜,通过扫描电镜(SEM)、接触角测定、过滤实验和污染性测试等研究了其微结构、分离性和耐污染性能等,并考察膜污染后有效的清洗方法.结果表明,添加FTNT的杂化膜具有不同的微结构与性能,当添加1%FTNT时,杂化膜皮层变薄、微孔数增多,并呈现出最优化的水通量、亲水性、耐压性和抗污染能力等,而对腐殖酸(HA)溶液的截留率略有提高.采用0.01mol/L的NaOH溶液碱洗和太阳光/水的绿色清洗工艺均能实现膜性能的恢复,而采用后者清洗的杂化膜通量恢复率可达到90%以上.The PVDF/FTNT hybrid ultrafiltration membranes were prepared by phase-inversion method with functionalized TiO2 nanotubes （FTNT） dispersed uniformly in the PVDF casting solution. The microstructure, separation performance and antifouling ability of such PVDF/FTNT hybrid membranes were investigated using SEM, contact angle, cross flow filtration and antifouling measurements, and efficient cleaning methods for the fouled membrane were also observed in detail. The results indicate that the hybrid membranes exhibit differences in microstructure and properties due to a certain content of functionalized TiO2 nanotubes addition. At mass fraction 1% FTNT, the thickness of skin layer decreased while fine interfacial micropores increased, meanwhile the hybrid membrane had excellent water permeability, hydrophilicity, antieompaction and good antifouling ability with somewhat elevated retention for HA solution. In addition; chemical cleaning with 0.01 mol/L NaOH and sunlight/water cleaning could effectively recover the permeance of membrane, and using the latter the flux recovery of hybrid membranes achieved above 90 %.

关 键 词：TIO2纳米管 聚偏氟乙烯 杂化膜 亲水性 绿色清洗 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业] TB383.2[一般工业技术—材料科学与工程]