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Title: The tripartite role of 2D covalent organic frameworks in graphene-based organic solvent nanofiltration membranes
Authors: Sui, Xiao
Wang, Yu
Liu, Fei
Yuan, Ziwen
Wang, Cheng
Yu, Yanxi
Zhou, Kun
Goh, Kunli
Chen, Yuan
Keywords: Engineering::Environmental engineering
Issue Date: 2021
Source: Sui, X., Wang, Y., Liu, F., Yuan, Z., Wang, C., Yu, Y., Zhou, K., Goh, K. & Chen, Y. (2021). The tripartite role of 2D covalent organic frameworks in graphene-based organic solvent nanofiltration membranes. Matter, 4(9), 2953-2969.
Journal: Matter
Abstract: Two-dimensional covalent organic frameworks (2D-COFs) have well-defined porosity and stability. Herein, we demonstrate that 2D-COFs can have three roles in nanolaminated graphene membranes for organic solvent nanofiltration (OSN). The optimized hybrid nanolaminate, assembled from 2D-COFs and reduced graphene oxide (rGO), shows a 162% enhancement in methanol permeance without sacrificing selectivity. When dry, intercalated 2D-COFs serve as a nanospacer to prevent the restacking of rGO. However, when wetted, 2D-COFs assume the additional roles of a stabilizer and a porous filler material. 2D-COFs alleviate rGO swelling in solvents because of a solvation-driven charge redistribution at the COF/rGO interface, which induces an attractive stabilizing force between COF and rGO nanosheets. Further, 2D-COFs can reduce transport pathway length by 15.5% and deliver “shortcuts” for solvent permeance. This work unravels the tripartite role of 2D-COFs as nanospacers/stabilizers/porous fillers, offering new insights into shaping the development of hybrid nanolaminated membranes for OSN.
ISSN: 2590-2385
DOI: 10.1016/j.matt.2021.06.043
Schools: School of Mechanical and Aerospace Engineering 
Research Centres: Nanyang Environment and Water Research Institute 
Environmental Process Modelling Centre 
Singapore Membrane Technology Centre 
Rights: © 2021 Elsevier Inc. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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