Self-assembly graphene oxide membrane embedded with CPU@PAA@TiO2 for enhancing the dyes separation and photocatalytic self-cleaning performance
Low separation efficiency and poor reusability have become the most important factors restricting the development of membranes in water purification . Herein, a photocatalytic self-cleaning graphene oxide (GO) membrane with a unique intercalated structure of CPU@PAA@TiO 2 (CPU: CNS@PDA@UiO-66-NH 2 , PAA: polyacrylic acid, CNS : carbon nanospheres, PDA: polydopamine) was prepared by simple vacuum filtration self-assembly. The water channels formed by photocatalysis nano-filler CPU@PAA@TiO 2 and the dense laminated structure of GO layer existed in the membrane at the same time. The core-shell CPU has a larger photocatalytic area than UiO-66-NH 2 . Moreover, the crosslinking modification of CPU, PAA, and TiO 2 leads to an excellent water flux, dye separation performance, and photocatalytic activity of composite membranes . The water flux of GO/CPU/PAA/TiO 2 membrane was 230.48 L ∙ m −2 ∙ h −1 ∙ bar −1 , and the flux of three dyes was over 220 L ∙ m −2 ∙ h −1 ∙ bar −1 while the removal rates were over 99.5%. After 120 min of visible light irradiation, the GO/CPU/PAA/TiO 2 membrane exhibited an enhanced degradation (94.21%) for methylene blue because of the suitable band-gap alignment and synergistic effect between CPU and TiO 2 . In addition, the GO/CPU/PAA/TiO 2 membrane exhibited excellent acid/alkaline-stability and reusability in dye filtration and photocatalytic performance. The results indicated that the GO/CPU/PAA/TiO 2 membrane has great potential in water purification and photocatalytic self-cleaning.
危险品化学品经营许可证（带存储）