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  • Title: Oriented UiO-67 Metal-Organic Framework Membrane with Fast and Selective Lithium-Ion Transport.
    Author: Xu R, Kang Y, Zhang W, Zhang X, Pan B.
    Journal: Angew Chem Int Ed Engl; 2022 Jan 17; 61(3):e202115443. PubMed ID: 34799948.
    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.
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