Oriented UiO-67 Metal-Organic Framework Membrane with Fast and Selective Lithium-Ion Transport

Rongming Xu; Yuan Kang; Weiming Zhang; Xiwang Zhang; Bingcai Pan

doi:10.1002/anie.202115443

Oriented UiO-67 Metal-Organic Framework Membrane with Fast and Selective Lithium-Ion Transport

Angew Chem Int Ed Engl. 2022 Jan 17;61(3):e202115443. doi: 10.1002/anie.202115443. Epub 2021 Nov 30.

Authors

Rongming Xu^{1

2}, Yuan Kang³, Weiming Zhang^{1

2}, Xiwang Zhang³, Bingcai Pan^{1

2}

Affiliations

¹ State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
² Research Center for Environmental Nanotechnology (ReCENT), Nanjing University, Nanjing, 210023, China.
³ Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia.

PMID: 34799948
DOI: 10.1002/anie.202115443

Abstract

Metal-organic frameworks (MOFs) membranes with high pore density and tunable pore size down to the subnanoscale exhibit great potential in ion separation when appropriately designed and prepared. By a washing-assisted secondary growing method, a well intergrown UiO-67 membrane with preferential growth along the [022] direction was synthesized on a polyvinylpyrrolidone (PVP)-modified AAO substrate. Because of the oriented growth of UiO-67 nanocrystals, highly interconnected ion-transporting channels are created throughout the UiO-67/AAO membrane capable of achieving an ultrahigh Li⁺ permeance of 27.01 mol m^-2 h^-1 as well as very decent Li⁺ /Mg²⁺ selectivity of up to 159.4. Molecular dynamics simulations reveal that the high selectivity is associated with the large disparity of the transport energy barrier between Li⁺ and Mg²⁺ , which is caused by different extents of ion dehydration in unique bimodal and oriented membrane channels.

Keywords: Ion dehydration; Ion separation; Lithium ion fast transport; Metal-organic frameworks; Subnanometer pore membrane.

Abstract

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