期刊
NANO LETTERS
卷 20, 期 11, 页码 7844-7851出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02114
关键词
MoS2; membrane; 2D channel; molecular spacer; interlayer spacing; separation
类别
资金
- Pritzker School of Molecular Engineering
- Research Computing Center at the University of Chicago
- Advanced Materials for Energy-Water-Systems (AMEWS) Center, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences
- Center for Nanoscale Materials, an Office of Science user facility at Argonne National Laboratory [DE-AC02-06CH11357]
Restacked two-dimensional (2D) materials represent a new class of membranes for water-ion separations. Understanding the interplay between the 2D membrane's structure and the constituent material's surface chemistry to its ion sieving properties is crucial for further membrane development. Here, we reveal, and tune via covalent functionalization, the structure of MoS2-based membranes. We find features on both the similar to 1 nm (interlayer spacing) and similar to 100 nm (mesoporous voids between layers) length scales that evolve with the hydration level. The functional groups act as permanent molecular spacers, preventing local impermeability caused by irreversible restacking and promoting the uniform rehydration of the membrane. Molecular dynamics simulations show that the choice of functional group tunes the structure of water within the MoS2 channel and consequently determines the hydrated interlayer spacing. We demonstrate that MoS2 membranes functionalized with acetic acid have consistently similar to 92% rejection of Na2SO4 with a flux of similar to 1.5 lm(-2) hr(-1) bar(-1).
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