首页|A Matthew MXene(Ti3C2Tx)Lamellar Membrane as a Potassium-Sieving Amplifier
A Matthew MXene(Ti3C2Tx)Lamellar Membrane as a Potassium-Sieving Amplifier
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Transport channels with ultrahigh K+selectivity over other ions play a crucial role for living beings,but constructing ionic channels with promising K+selectivity and permeability remains a challenge.Here,an asymmetric bilayer membrane based on MXene(Ti3C2Tx)lamellar channels consisting of a recognition layer(RL)on top of an enhancement layer(EL)exhibits an amazing Matthew effect:amplification of the preferred transport of K+,resulting in an excellent K+-separation performance.The K+ion is selected by the 1-aza-18-crown-6 ether-modified RL,owing to preferential affinity energy,and then rapidly trans-ported as a hydrated ion through the EL,based on the confinement effect.Other undesired ions such as Na+are hindered from entering the RL by the preferred K+occupation of the crown ether.The MXene(Ti3C2Tx)-based Matthew membrane presents high K+-permeation rates of 0.1-0.2 mol·m-2·h-1,with a significant K+/Na+selectivity of 5-9.The molecular separation mechanism of the Matthew membrane is investigated deeply to explore the nature of the Matthew amplification effect on K+sieving,where the precise matching of the RL and EL within the membrane governs the fast K+permeation with good selectivity.The asymmetric structure of our Matthew membrane is the key to understanding the biolog-ical function of ion channels for precise and fast ion transport,which will guide us in the creation of arti-ficial ion channels or membranes.
School of Chemistry and Chemical Engineering & Guangdong Provincial Key Lab of Green Chemical Product Technology & State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China
Beijing Key Laboratory for Membrane Materials and Engineering,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China
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