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https://hdl.handle.net/2440/136464
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Type: | Journal article |
Title: | The tripartite role of 2D covalent organic frameworks in graphene-based organic solvent nanofiltration membranes |
Author: | Sui, X. Wang, Y. Liu, F. Yuan, Z. Wang, C. Yu, Y. Zhou, K. Goh, K. Chen, Y. |
Citation: | MATTER, 2021; 4(9):2953-2969 |
Publisher: | Elsevier |
Issue Date: | 2021 |
ISSN: | 2590-2393 2590-2385 |
Statement of Responsibility: | Xiao Sui, Yu Wang, Fei Liu, Ziwen Yuan, Cheng Wang, Yanxi Yu, Kun Zhou, Kunli Goh, and Yuan Chen |
Abstract: | Two-dimensional covalent organic frameworks (2D-COFs) have welldefined porosity and stability. Herein, we demonstrate that 2DCOFs 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. |
Rights: | © 2021 Elsevier Inc. |
DOI: | 10.1016/j.matt.2021.06.043 |
Grant ID: | http://purl.org/au-research/grants/arc/FT160100107 |
Published version: | http://dx.doi.org/10.1016/j.matt.2021.06.043 |
Appears in Collections: | Chemical Engineering publications |
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