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Title: The roles of metal-organic frameworks in modulating water permeability of graphene oxide-based carbon membranes
Authors: Sui, Xiao
Ding, Hongru
Yuan, Ziwen
Leong, Chanel F.
Goh, Kunli
Li, Wei
Yang, Nuo
D'Alessandro, Deanna M.
Chen, Yuan
Keywords: Engineering::Chemical engineering
Issue Date: 2019
Source: Sui, X., Ding, H., Yuan, Z., Leong, C. F., Goh, K., Li, W., Yang, N., D'Alessandro, D. M. & Chen, Y. (2019). The roles of metal-organic frameworks in modulating water permeability of graphene oxide-based carbon membranes. Carbon, 148, 277-289.
Journal: Carbon
Abstract: Graphene oxide (GO) can be processed into carbon membranes with unique water permeability and molecular selectivity. Metal-organic frameworks (MOFs) have been proposed as filler materials to enhance water permeability of laminar GO-based carbon membranes. However, it remains unclear how the enhancement arises. Herein, we combined experimental and molecular simulation studies to provide critical insights into the water transport behaviors of GO/MOF composite membranes. The water permeability enhancement was found to be directly correlated to the increase in the average interlayer spacing between GO nanosheets. The simulation results indicate a slower water transport through nanochannels in MOFs than in nanochannels formed by GO nanosheets. A small amount of MOF particles only serves as a blockage in laminar GO membranes, suppressing their water permeability. In contrast, a large amount of MOF particles increases the interlayer spacing between GO nanosheets and creates very fast water transport stretches. Besides, some large gaps are formed between non-smooth MOF particles and GO nanosheets, adding supplementary water channels to deliver higher water permeability. We envision a shift in future research direction to exploit the selective adsorption capacity of MOFs other than leveraging them as fast water transport channels to realize their potential water treatment applications.
ISSN: 0008-6223
DOI: 10.1016/j.carbon.2019.03.049
Rights: © 2019 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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