Wang Chenglong, Zhang Chenglan, Lu Chenchen, Wang Hehe, Guo Chenxin, Michał Nowicki, Roman Szewczyk, Chang Chunyu, Peng Na
Key Laboratory of Coal Conversion and New Carbon Materials of Hubei Province, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, P. R. China.
College of Chemistry and Molecular Sciences, Key Laboratory of Biomedical Polymers of Ministry of Education, Wuhan University, Wuhan 430072, China.
Langmuir. 2025 Jul 8;41(26):17235-17246. doi: 10.1021/acs.langmuir.5c01978. Epub 2025 Jun 24.
TiO-coated chitin nanocrystals (TiO@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. TiO was generated on the surface of chitin nanocrystals (ChNCs) to obtain ChNC@TiO. Subsequently, polydopamine (PDA) was used as an adhesive to insert ChNC@TiO into MXene nanosheets, followed by vacuum filtration to obtain the ChNC@TiO membranes. With the addition of ChNC@TiO, 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@TiO, the pure water permeance of the MXene/ChNC@TiO composite membrane increased from 2450 L m h bar of the MXene membrane to 4480 L m h bar. 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 TiO nanoparticles, MXene/ChNC@TiO 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.
制备了插入二维（2D）MXene纳米片之间的TiO包覆甲壳素纳米晶体（TiO@ChNCs）以及具有油/水乳液分离和染料可见光光催化降解性能的复合膜。在甲壳素纳米晶体（ChNCs）表面生成TiO以获得ChNC@TiO。随后，使用聚多巴胺（PDA）作为粘合剂将ChNC@TiO插入MXene纳米片中，然后通过真空过滤获得ChNC@TiO膜。随着ChNC@TiO的加入，膜的亲水性和水渗透通量显著提高。由于ChNC@TiO插入形成的独特水通道结构，MXene/ChNC@TiO复合膜的纯水渗透通量从MXene膜的2450 L m⁻² h⁻¹ bar提高到4480 L m⁻² h⁻¹ bar。油/水分离实验表明，该复合膜能够有效分离各种含表面活性剂的油/水乳液，同时保持优异的稳定性（在1 M HCl和1 M NaOH中）和可回收性。此外，由于MXene纳米片和TiO纳米颗粒的协同作用，MXene/ChNC@TiO膜在可见光下对膜上截留的刚果红（CR）、结晶紫（CV）和亚甲基蓝（MeB）表现出优异的光催化降解性能。我们的工作为设计具有自清洁能力的基于MXene的分离膜提供了新的见解，可用于油/水微乳液分离和有机染料的光催化降解。
