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Issue 12, 2021
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Heterostructured graphene oxide membranes with tunable water-capture coatings for highly selective water permeation

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Abstract

Graphene oxide (GO) laminar membranes with fast water-transport nanochannels hold great promise for water-selective molecular separations, but the water-capture ability of membrane surfaces limits the separation performance. Herein, we engineered water-capture coatings on GO laminar membranes using structurally tunable tannic acid (TA) nanoaggregates as building blocks via a bottom-up method, acquiring heterostructured GO membranes for alcohol dehydration. The abundant oxygenated functional groups of TA coatings captured water from alcohol aqueous solutions and enhanced the surface water-capture capacity by up to 309%. We manipulated the surface water-capture ability by regulating the aggregation structure and the subsequent assembly process of the TA nanoaggregates. By virtue of the synergistic effect of the enhanced surface water-capture ability and fast water-transport GO nanochannels, the optimized heterostructured GO membrane exhibited high permeation flux of 9988 g m−2 h−1 and a superior separation factor of 4424 for n-butanol dehydration. This study provides a novel avenue to high-performance GO membranes with rationally designed heterostructures.

Graphical abstract: Heterostructured graphene oxide membranes with tunable water-capture coatings for highly selective water permeation

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Supplementary files

Article information


Submitted
05 Jan 2021
Accepted
28 Feb 2021
First published
01 Mar 2021

J. Mater. Chem. A, 2021,9, 7903-7912
Article type
Paper

Heterostructured graphene oxide membranes with tunable water-capture coatings for highly selective water permeation

Z. Zhang, H. Wu, Y. Li, Y. Liu, C. Cao, H. Wang, M. Wang, F. Pan and Z. Jiang, J. Mater. Chem. A, 2021, 9, 7903
DOI: 10.1039/D1TA00090J

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