膜
化学工程
表面改性
渗透
材料科学
共价键
石墨烯
氧化物
二硫化钼
选择性
扩散
纳米技术
化学
有机化学
催化作用
物理
工程类
冶金
热力学
生物化学
作者
Lucie Ries,Eddy Petit,Thierry Michel,Cristina Coelho Diogo,Christel Gervais,Chrystelle Salameh,Mikhaël Bechelany,Sébastien Balme,Philippe Miele,Nicolas Onofrio,Damien Voiry
出处
期刊:Nature Materials
[Springer Nature]
日期:2019-08-26
卷期号:18 (10): 1112-1117
被引量:225
标识
DOI:10.1038/s41563-019-0464-7
摘要
Nanolaminate membranes made of two-dimensional materials such as graphene oxide are promising candidates for molecular sieving via size-limited diffusion in the two-dimensional capillaries, but high hydrophilicity makes these membranes unstable in water. Here, we report a nanolaminate membrane based on covalently functionalized molybdenum disulfide (MoS2) nanosheets. The functionalized MoS2 membranes demonstrate >90% and ~87% rejection for micropollutants and NaCl, respectively, when operating under reverse osmotic conditions. The sieving performance and water flux of the functionalized MoS2 membranes are attributed both to control of the capillary widths of the nanolaminates and to control of the surface chemistry of the nanosheets. We identify small hydrophobic functional groups, such as the methyl group, as the most promising for water purification. Methyl- functionalized nanosheets show high water permeation rates as confirmed by our molecular dynamic simulations, while maintaining high NaCl rejection. Control of the surface chemistry and the interlayer spacing therefore offers opportunities to tune the selectivity of the membranes while enhancing their stability.
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