浸渍提拉法制备TiO2/不锈钢中空纤维复合膜及其应用
作者:高佳明,马晓华,汤初阳,许振良,庄黎伟,魏永明,杨虎,李金荣,宋振,郑鹤立
单位: 1 西陇科学股份有限公司,广东,汕头 515000;2 化学工程国家重点实验室,华东理工大学膜科学与工程研发中心,上海 200237
关键词: 不锈钢复合膜;二氧化钛;浸渍提拉法;油水分离
分类号: TQ028.8
出版年,卷(期):页码: 2020,40(3):55-64

摘要:
大孔无机膜基底的表面改性,一般采用溶胶-凝胶法以求表面均匀性。但是溶胶-凝胶法合成工艺复杂,控制因素较多,限制了其在工业领域的应用。利用悬浮液体系改性不锈钢中空纤维膜,采用浸渍提拉法在不锈钢膜表面涂覆25nm的TiO2粒子,通过500℃的高温烧结制备了TiO2/不锈钢中空纤维复合膜。研究了PVA和TiO2浓度对不锈钢中空纤维膜的形貌,孔径,纯水通量和抗污染性能的影响。结果表明,我们制备的TiO2功能层具有超亲水和水下超疏油性,对BSA的截留达到90%,油水乳液分离率超过99%,并且具有良好的分离性能和抗污染性能。
The surface modification of the microporous inorganic membrane substrate is usually carried out by sol-gel method. However, the sol-gel synthesis process is complex and controlled by many factors, which limits its application in industry. In this paper, the suspension system was used to modify stainless steel hollow fiber membranes. Titanium dioxide particles of 25 nm were coated on the surface of stainless steel membranes by dip-coating method. The composite membranes of TiO2/stainless steel hollow fiber were prepared by high temperature sintering at 500 ℃. The effects of Polyvinyl alcohol and TiO2 concentration on the morphology, pore size, pure water flux and anti-pollution properties of stainless steel hollow fiber membranes were studied. The results showed that the TiO2 functional layer was super-hydrophilic and underwater super-hydrophobic. The rejection of BSA was 90%, and the rejection of oil-water emulsion was over 99%, which had good separation and antifouling properties.

基金项目:
国家自然科学基金(21406060)

作者简介:
第一作者:高佳明(1994-),男,硕士研究生。 通讯作者:马晓华,E-mail:xiaohuama@ecust.edu.cn。

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