A Two-Dimensional Lamellar Membrane: MXene Nanosheet Stacks

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• 作者：Li Ding ; Dr. Yanying Wei ; Yanjie Wang ; Hongbin Chen ; Prof. Dr. Jü ; rgen Caro and Prof. Dr. Haihui Wang
• 刊名：Angewandte Chemie International Edition
• 出版年：2017
• 出版时间：February 6, 2017
• 年：2017
• 卷：56
• 期：7
• 页码：1825-1829
• 全文大小：2820K
• ISSN：1521-3773

文摘

Two-dimensional (2D) materials are promising candidates for advanced water purification membranes. A new kind of lamellar membrane is based on a stack of 2D MXene nanosheets. Starting from compact Ti₃AlC₂, delaminated nanosheets of the composition Ti₃C₂T_x with the functional groups T (O, OH, and/or F) can be produced by etching and ultrasonication and stapled on a porous support by vacuum filtration. The MXene membrane supported on anodic aluminum oxide (AAO) substrate shows excellent water permeance (more than 1000 L m⁻² h⁻¹ bar⁻¹) and favorable rejection rate (over 90 %) for molecules with sizes larger than 2.5 nm. The water permeance through the MXene membrane is much higher than that of the most membranes with similar rejections. Long-time operation also reveals the outstanding stability of the MXene membrane for water purification.