Please use this identifier to cite or link to this item: https://doi.org/10.1039/c7nr07193k
Title: A graphene-like membrane with an ultrahigh water flux for desalination
Authors: Yan, YG
Wang, WS
Li, W
Loh, KP 
Zhang, J 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Multidisciplinary
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Physics, Applied
Chemistry
Science & Technology - Other Topics
Materials Science
Physics
CARBON NANOTUBE MEMBRANES
SINGLE-LAYER GRAPHENE
NANOPOROUS GRAPHENE
MONOLAYER GRAPHENE
POROUS GRAPHENE
VACANCY DEFECTS
TRANSPORT
TECHNOLOGY
MECHANISMS
PERMEATION
Issue Date: 21-Dec-2017
Publisher: Royal Society of Chemistry
Citation: Yan, YG, Wang, WS, Li, W, Loh, KP, Zhang, J (2017-12-21). A graphene-like membrane with an ultrahigh water flux for desalination. NANOSCALE 9 (47) : 18951-18958. ScholarBank@NUS Repository. https://doi.org/10.1039/c7nr07193k
Abstract: © 2017 The Royal Society of Chemistry. An ultrathin nanoporous membrane which combines high water permeability and high salt rejection is the core of ultrafiltration technology. Recently, we reported the synthesis of a chemically robust and nanoporous two-dimensional conjugated aromatic polymer (2D-CAP) membrane. Due to its array of highly regular sub-nanometer pores and channels, the ultrathin 2D-CAP membrane can be potentially used in desalination. Herein, we used molecular dynamics simulations to analyze the transmembrane hydrodynamics of mono- and multi-layer 2D-CAP membranes as a function of layer number. The energy barriers to water and ions across these membranes were calculated to evaluate the potential of 2D-CAP to function as the ultimate RO membrane. Our simulation results show that the bilayer CAP membrane exhibits superior ion rejection (100%) and a water flux (1172 L m-2 h-1 bar-1) with a performance that is three orders of magnitude higher than the commercial reverse osmosis membrane, which is three times higher than the theoretically reported monolayer nanoporous MoS2 membrane (the state-of-the-art membrane reported for desalination). In addition, the 2D-CAP bilayer membrane is highly resistant to swelling even at a high water flux. The monolayer 2D-CAP membrane shows good ion selectivity between monovalent and divalent ions.
Source Title: NANOSCALE
URI: https://scholarbank.nus.edu.sg/handle/10635/171625
ISSN: 20403364
20403372
DOI: 10.1039/c7nr07193k
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