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Enhanced sieving from exfoliated MoS2 membranes via covalent functionalization.
Nature Materials ( IF 37.2 ) Pub Date : 2019-08-26 , DOI: 10.1038/s41563-019-0464-7 Lucie Ries 1 , Eddy Petit 1 , Thierry Michel 2 , Cristina Coelho Diogo 3 , Christel Gervais 4, 5 , Chrystelle Salameh 1 , Mikhael Bechelany 1 , Sébastien Balme 1 , Philippe Miele 1, 5 , Nicolas Onofrio 6 , Damien Voiry 1
Nature Materials ( IF 37.2 ) Pub Date : 2019-08-26 , DOI: 10.1038/s41563-019-0464-7 Lucie Ries 1 , Eddy Petit 1 , Thierry Michel 2 , Cristina Coelho Diogo 3 , Christel Gervais 4, 5 , Chrystelle Salameh 1 , Mikhael Bechelany 1 , Sébastien Balme 1 , Philippe Miele 1, 5 , Nicolas Onofrio 6 , Damien Voiry 1
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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.
中文翻译：
通过共价官能化从脱落的MoS2膜上增强筛分。
由二维材料（例如氧化石墨烯）制成的纳米层压膜有望通过二维毛细管中的尺寸受限扩散进行分子筛分离，但是高亲水性使这些膜在水中不稳定。在这里，我们报告了基于共价官能化的二硫化钼（MoS2）纳米片的纳米层压膜。当在反渗透条件下运行时，功能化的MoS2膜分别对微污染物和NaCl表现出大于90％和〜87％的排斥率。官能化的MoS 2膜的筛分性能和水通量既归因于对纳米层压体的毛细管宽度的控制，也归因于对纳米片的表面化学的控制。我们确定了小的疏水性官能团，例如甲基 作为最有前途的净水器。如我们的分子动力学模拟所证实，甲基官能化的纳米片材显示出高的水渗透率，同时保持了较高的NaCl截留率。因此，表面化学和层间间隔的控制为调节膜的选择性提供了机会，同时提高了膜的稳定性。
更新日期：2019-08-27
中文翻译：
通过共价官能化从脱落的MoS2膜上增强筛分。
由二维材料（例如氧化石墨烯）制成的纳米层压膜有望通过二维毛细管中的尺寸受限扩散进行分子筛分离，但是高亲水性使这些膜在水中不稳定。在这里，我们报告了基于共价官能化的二硫化钼（MoS2）纳米片的纳米层压膜。当在反渗透条件下运行时，功能化的MoS2膜分别对微污染物和NaCl表现出大于90％和〜87％的排斥率。官能化的MoS 2膜的筛分性能和水通量既归因于对纳米层压体的毛细管宽度的控制，也归因于对纳米片的表面化学的控制。我们确定了小的疏水性官能团，例如甲基 作为最有前途的净水器。如我们的分子动力学模拟所证实，甲基官能化的纳米片材显示出高的水渗透率，同时保持了较高的NaCl截留率。因此，表面化学和层间间隔的控制为调节膜的选择性提供了机会，同时提高了膜的稳定性。
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