Highly permeable and dye-rejective nanofiltration membranes of TiO2 and Bi2S3 double-embedded Ti3C2T with a visible-light-induced self-cleaning ability

• DOI: 10.1016/j.jmrt.2022.04.104
• Publication Date: 2022-04-26T00:34:22Z
• Authors: Haimeng Huang; Yuanyuan Xu; Zhiyong Lu; Aihua Zhang; Daofeng Zhang; Huapeng Xue; Ping Dong; Jianfeng Zhang; Takashi Goto
• Keywords: Nanofiltration; Bacterial Cellulose

To conquer the trade-off dilemma of nanofiltration membranes for both high permeability water and rejection pollutants has long been highly concerned. In this work, TiO2 Bi2S3 nanoparticles were evenly dispersed successively into interlayers Ti3C2Tx nanosheets, then filtered onto cellulose acetate support membranes. The as-obtained composite exhibited a maximum flux 374.4 L m−2 h−1 bar−1, ratio RhB, GR, MB BSA at 97.8–100%, apparently higher than those related in literature. Such separation capacity was found quite stable various dye-containing aqueous solutions, even salinity environment 5 wt% NaCl. Interestingly, 25% NaCl salt also rejected accompanying almost complete dye pollutants. After filtering process, membrane fouling fouled Ti3C2Tx/TiO2/Bi2S3 verified lower that Ti3C2Tx/TiO2 Furthermore, recovery rate could reach 92.1% after washing under visible light, which be ascribed to composition heterojunction causing red shift diffuse reflectance UV–vis spectra narrowing band gap. This study provides new idea preparation permeable rejective membranes, lays foundation its high-capacity removal applications.