Enhanced sieving from exfoliated MoS2 membranes via covalent functionalization

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
1 IEM - Institut Européen des membranes
2 L2C - Laboratoire Charles Coulomb
3 Sorbonne Univ, Inst Mat Paris Ctr, Paris, France
4 LCMCP (site Paris VI) - Laboratoire de Chimie de la Matière Condensée de Paris (site Paris VI)
5 IUF - Institut Universitaire de France
6 Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Peoples R China
Abstract : 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 similar to 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
Keywords : REACTIVE FORCE-FIELD GRAPHENE OXIDE IONIC TRANSPORT NANOFILTRATION STABILITY REAXFF WATER PERMEATION SIMULATION SEPARATION
Type de document :
Article dans une revue
Domaine :
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https://hal.umontpellier.fr/hal-02310531
Contributeur : Philippe Falque <>
Soumis le : jeudi 10 octobre 2019 - 11:32:01
Dernière modification le : mardi 5 novembre 2019 - 17:14:40

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UNIV-MONTPELLIER | ENSCP | L2C | CNRS | INC-CNRS | MIPS | CHIMIE | IEM | SORBONNE-UNIVERSITE | PARISTECH | LCMCP_PARISVI | LCMCP | PSL | SU-SCIENCES

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Lucie Ries, Eddy Petit, Thierry Michel, Cristina Coelho Diogo, Christel Gervais, et al.. Enhanced sieving from exfoliated MoS2 membranes via covalent functionalization. Nature Materials, Nature Publishing Group, 2019, 18 (10), pp.1112-1117. ⟨10.1038/s41563-019-0464-7⟩. ⟨hal-02310531⟩

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