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A Lamellar MXene (Ti 3 C 2 T x )/PSS Composite Membrane for Fast and Selective Lithium‐Ion Separation
Author(s) -
Lu Zong,
Wu Ying,
Ding Li,
Wei Yanying,
Wang Haihui
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202108801
Subject(s) - permeation , membrane , lamellar structure , sulfonate , lithium (medication) , ion , selectivity , chemistry , styrene , inorganic chemistry , chemical engineering , sodium , materials science , analytical chemistry (journal) , crystallography , chromatography , organic chemistry , copolymer , polymer , medicine , biochemistry , engineering , catalysis , endocrinology
Abstract A two‐dimensional (2D) laminar membrane with Li + selective transport channels is obtained by stacking MXene nanosheets with the introduction of poly(sodium 4‐styrene sulfonate) (PSS) with active sulfonate sites, which exhibits excellent Li + selectivity from ionic mixture solutions of Na + , K + , and Mg 2+ . The Li + permeation rate through the MXene@PSS composite membrane is as high as 0.08 mol m −2 h −1 , while the Li + /Mg 2+ , Li + /Na + , and Li + /K + selectivities are 28, 15.5, and 12.7, respectively. Combining the simulation and experimental results, we further confirm that the highly selective rapid transport of partially dehydrated Li + within subnanochannels can be attributed to the precisely controlled interlayer spacing and the relatively weaker ion‐terminal (−SO 3 − ) interaction. This study deepens the understanding of ion‐selective permeation in confined channels and provides a general membrane design concept.