A Lamellar MXene (Ti3C2Tx)/PSS Composite Membrane for Fast and Selective Lithium-Ion Separation,Angewandte Chemie International Edition

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A Lamellar MXene (Ti3C2Tx)/PSS Composite Membrane for Fast and Selective Lithium-Ion Separation
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-08-11 , DOI: 10.1002/anie.202108801
Zong Lu ₁ , Ying Wu ₁ , Li Ding ₁ , Yanying Wei ₁ , Haihui Wang ₂

Affiliation

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.

中文翻译：

用于快速和选择性锂离子分离的层状 MXene (Ti3C2Tx)/PSS 复合膜

通过将 MXene 纳米片堆叠并引入具有活性磺酸盐位点的聚（4-苯乙烯磺酸钠）（PSS），获得具有 Li ⁺选择性传输通道的二维（2D）层状膜，该膜对离子混合物表现出优异的 Li ⁺选择性Na ⁺、K ⁺和 Mg ^{2+ 的}溶液。通过MXene@PSS复合膜的Li ⁺渗透率高达0.08 mol m ^-2 h ^-1，而Li ⁺ /Mg ²⁺、Li ⁺ /Na ⁺和Li ⁺ /K ⁺选择性分别为 28、15.5 和 12.7。结合模拟和实验结果，我们进一步证实亚纳米通道内部分脱水的 Li ⁺的高度选择性快速传输可归因于精确控制的层间距和相对较弱的离子末端（-SO ₃^-）相互作用。这项研究加深了对受限通道中离子选择性渗透的理解，并提供了一般的膜设计概念。

更新日期：2021-09-27

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