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

    Year: 2021

    Journal: J. Mater. Chem. A, Volume 9, MAR 28, page 7903–7912

    Authors: Zhang, Zhiming; Wu, Hong; Li, Ying; Liu, Yue; Cao, Chenliang; Wang, Hongjian; Wang, Meidi; Pan, Fusheng; Jiang, Zhongyi

    Organizations: National Natural Science Foundation of China [21878215, 21621004, 21878216, 91934302, 21838008]; Programme of Introducing Talents of Discipline to Universities [BP0618007]

    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.
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