Abstract
AbstractMetal–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.
Published Version
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