Volume 133, Issue 41 pp. 22439-22443
Zuschrift

A Lamellar MXene (Ti3C2Tx)/PSS Composite Membrane for Fast and Selective Lithium-Ion Separation

Zong Lu

Zong Lu

School of Chemistry and Chemical Engineering, South China University of Technology, 510640 Guangzhou, China

These authors contributed equally to this work.

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Ying Wu

Ying Wu

School of Chemistry and Chemical Engineering, South China University of Technology, 510640 Guangzhou, China

These authors contributed equally to this work.

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Li Ding

Li Ding

School of Chemistry and Chemical Engineering, South China University of Technology, 510640 Guangzhou, China

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Prof. Dr. Yanying Wei

Corresponding Author

Prof. Dr. Yanying Wei

School of Chemistry and Chemical Engineering, South China University of Technology, 510640 Guangzhou, China

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Prof. Dr. Haihui Wang

Corresponding Author

Prof. Dr. Haihui Wang

Beijing Key Laboratory for Membrane Materials and Engineering, Department of Chemical Engineering, Tsinghua University, 100084 Beijing, China

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First published: 11 August 2021
Citations: 30

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 Mg2+. The Li+ permeation rate through the MXene@PSS composite membrane is as high as 0.08 mol m−2 h−1, while the Li+/Mg2+, 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 (−SO3) interaction. This study deepens the understanding of ion-selective permeation in confined channels and provides a general membrane design concept.

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