微乳液
降级(电信)
光催化
化学工程
膜
材料科学
化学
纳米技术
色谱法
有机化学
催化作用
肺表面活性物质
电信
计算机科学
生物化学
工程类
作者
Chenglong Wang,Chenglan Zhang,Chenchen Lü,Hehe Wang,Chao Guo,Nowicki Michał,Szewczyk Roman,Chunyu Chang,Na Peng
出处
期刊:Langmuir
[American Chemical Society]
日期:2025-06-24
标识
DOI:10.1021/acs.langmuir.5c01978
摘要
TiO2-coated chitin nanocrystals (TiO2@ChNCs) inserted between two-dimensional (2D) nanosheets of MXene, and composite membranes with both oil/water emulsion separation and visible photocatalytic degradation of dyes, were prepared. TiO2 was generated in situ on the surface of chitin nanocrystals (ChNCs) to obtain ChNC@TiO2. Subsequently, polydopamine (PDA) was used as an adhesive to insert ChNC@TiO2 into MXene nanosheets, followed by vacuum filtration to obtain the ChNC@TiO2 membranes. With the addition of ChNC@TiO2, the hydrophilicity and water permeance of the membrane were significantly improved. Due to the unique water channel structure formed by the insertion of the ChNC@TiO2, the pure water permeance of the MXene/ChNC@TiO2 composite membrane increased from 2450 L m-2 h-1 bar-1 of the MXene membrane to 4480 L m-2 h-1 bar-1. Oil/water separation experiments showed that the composite membrane could effectively separate various oil/water emulsions containing surfactants while maintaining excellent stability (with 1 M HCl and 1 M NaOH) and recyclability. In addition, due to the synergistic effect of MXene nanosheets and TiO2 nanoparticles, MXene/ChNC@TiO2 membranes exhibited excellent photocatalytic degradation properties under visible light for Congo Red (CR), Crystal Violet (CV), and Methylene Blue (MeB) trapped on the membrane. Our work provides new insights into the design of MXene-based separation membranes with self-cleaning capabilities for the separation of oil/water microemulsions and the photocatalytic degradation of organic dyes.
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