A Matthew MXene(Ti_(3)C_(2)T_(x))Lamellar Membrane as a Potassium-Sieving Amplifier  

作　　者：Zong Lu Haoyu Wu Yanying Wei Haihui Wang 

机构地区：[1]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 [2]Beijing Key Laboratory for Membrane Materials and Engineering,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Engineering》2024年第11期213-222,共10页工程（英文）

基　　金：support from the National Key Research and Development Program(2021YFB3802500);the National Natural Science Foundation of China(22022805 and 22078107);supported by State Key Laboratory of Pulp and Paper Engineering(2022PY04)and Fundamental Research Funds for the Central Universities(2022ZYGXZR010).

摘　　要：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(Ti 3C2Tx)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(Ti_(3)C_(2)T_(x))-based Matthew membrane presents high K^(+)-permeation rates of 0.1-0.2 mol∙m2∙h1,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.

关 键 词：MXene(Ti_(3)C_(2)T_(x))membrane Membrane separation Ion sieving K^(+)selectivity 

分 类 号：TB383.2[一般工业技术—材料科学与工程]