Liao Peng, You Lan, Zheng Wen Jiang, Zou Wei, Yan Jie, Yang Hu, Yang Fan
Sichuan University of Science and Engineering Zigong 643000 PR China
Organic Fluorine Material Key Laboratory of Sichuan Province, Zhonghao Chenguang Chemical Research Institute Zigong 643201 PR China.
RSC Adv. 2022 May 4;12(21):13228-13234. doi: 10.1039/d2ra01026g. eCollection 2022 Apr 28.
Membrane surface fouling is a key problem for water filtration. Compositing photocatalytic substances with a base membrane is a widely used strategy, but most of the membrane will be decomposed by photocatalysis. Herein, expanded polytetrafluoroethylene (ePTFE) with extremely stable chemical properties is grafted with polyacrylic acid (PAA) and then modified with titanium dioxide (TiO) to realize a self-cleaning TiO-PAA-ePTFE filtration membrane. It can recover its flux under UV irradiation after fouling. With 20 rounds of self-cleaning, the membrane microstructure still remains intact. Moreover, in addition to retaining bovine serum albumin, TiO particles on the membrane surface are capable of absorbing small organic pollutants and degrading them. Thus, this membrane is potentially used as an anti-fouling membrane for water filtration.
膜表面污染是水过滤的关键问题。将光催化物质与基膜复合是一种广泛使用的策略，但大多数膜会被光催化分解。在此，将化学性质极其稳定的膨体聚四氟乙烯（ePTFE）与聚丙烯酸（PAA）接枝，然后用二氧化钛（TiO₂）进行改性，以实现自清洁的TiO₂-PAA-ePTFE过滤膜。该膜在污染后经紫外线照射可恢复通量。经过20轮自清洁后，膜的微观结构仍然保持完整。此外，除了截留牛血清白蛋白外，膜表面的TiO₂颗粒还能够吸附并降解小有机污染物。因此，这种膜有潜力用作水过滤的抗污染膜。
