超声辅助溶胶-凝胶法制备中空纤维TiO_(2)超滤膜  

Fabrication of Hollow Fiber Supported TiO_(2) Ultrafiltration Membranes via Ultrasound-assisted Sol-Gel Method

作　　者：吕庆洋 张玉亭 顾学红 Lü Qingyang;ZHANG Yuting;GU Xuehong(State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]南京工业大学化工学院,材料化学工程国家重点实验室,南京211816

出　　处：《无机材料学报》2022年第10期1051-1057,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(22035002,22008111);国家重点研发计划(2021YFC2101200)。

摘　　要：TiO_(2)膜具有亲水性强和热化学稳定性好等优点而用于超滤分离,但是TiO_(2)膜以管式膜为主,渗透通量低且制备周期长。为了提高TiO_(2)膜的渗透通量,并缩短膜的制备周期,本工作以钛酸四丁酯为前驱体,采用超声辅助溶胶-凝胶法制备高通量的中空纤维负载型TiO_(2)超滤膜。系统考察了硝酸与钛酸四丁酯的摩尔比(酸钛比)、超声时间和煅烧温度对TiO_(2)溶胶粒径及膜截留性能的影响。结果表明:当酸钛比为0.25时,溶胶的平均粒径为3252 nm,采用超声处理30 s后,平均粒径减小至1817 nm。采用超声后的溶胶循环涂膜并在350℃煅烧两次后可得到完整无缺陷的中空纤维TiO_(2)超滤膜,膜层平均厚度为1μm,膜的纯水渗透通量为145 L·m^(-2)·h^(-1)·bar^(-1)(1 bar=0.1 MPa),葡聚糖截留分子量为2586 Da,对应的平均孔径为2.5 nm。TiO_(2) membranes have been applied in ultrafiltration(UF)separation due to their strong hydrophilicity and good thermochemical stability,but most of them are tubular membranes with low permeation flux and time-consuming preparation.To improve the flux and save the preparation time of TiO_(2) membrane,hollow fiber supported TiO_(2) UF membranes were prepared via ultrasound-assisted Sol-Gel method by using tetrabutyl titanate as precursor.Effects of acid/titanium molar ratio,ultrasound time and calcination temperature on TiO_(2) sols and UF performance of membranes were investigated extensively.The results showed that when the acid/titanium ratio was 0.25,the obtained TiO_(2) sol showed an average particle size of 3252 nm,which would be reduced to 1817 nm after ultrasonic treatment for 30 s.Coating with the above TiO_(2) sol,defect-free TiO_(2) UF membrane with average thickness of 1μm can be prepared on hollow fiber support by calcining at 350℃ twice.The pure water flux of the obtained membrane was 145 L·m^(-2)·h^(-1)·bar^(-1),and the dextran molecular weight at 90%rejection of membrane was 2586 Da with corresponding average pore size of 2.5 nm.

关 键 词：超滤膜 溶胶 凝胶 TiO_(2) 超声辅助 

分 类 号：TQ174[化学工程—陶瓷工业]