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Medientyp:
Sonstige Veröffentlichung;
E-Artikel
Titel:
Shearing Liquid-Crystalline MXene into Lamellar Membranes with Super-Aligned Nanochannels for Ion Sieving
Beteiligte:
Huang, Lingzhi
[VerfasserIn];
Wu, Haoyu
[VerfasserIn];
Ding, Li
[VerfasserIn];
Caro, Jürgen
[VerfasserIn];
Wang, Haihui
[VerfasserIn]
Erschienen:
Weinheim : Wiley-VCH, 2023
Erschienen in:Angewandte Chemie International Edition (Formerly: Angewandte Chemie: International Edition in English) 63 (2024), Nr. 6 ; Angewandte Chemie International Edition (Formerly: Angewandte Chemie: International Edition in English)
Anmerkungen:
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Beschreibung:
Ion-selective membranes are crucial in various chemical and physiological processes. Numerous studies have demonstrated progress in separating monovalent/multivalent ions, but efficient monovalent/monovalent ion sieving remains a great challenge due to their same valence and similar radii. Here, this work reports a two-dimensional (2D) MXene membrane with super-aligned slit-shaped nanochannels with ultrahigh monovalent ion selectivity. The MXene membrane is prepared by applying shear forces to a liquid-crystalline (LC) MXene dispersion, which is conducive to the highly-ordered stacking of the MXene nanosheets. The obtained LC MXene membrane (LCMM) exhibits ultrahigh selectivities toward Li+/Na+, Li+/K+, and Li+/Rb+ separation (≈45, ≈49, and ≈59), combined with a fast Li+ transport with a permeation rate of ≈0.35 mol m−2 h−1, outperforming the state-of-the-art membranes. Theoretical calculations indicate that in MXene nanochannels, the hydrated Li+ with a tetrahedral shape has the smallest diameter among the monovalent ions, contributing to the highest mobility. Besides, the weakest interaction is found between hydrated Li+ and MXene channels which also contributes to the ultrafast permeation of Li+ through the super-aligned MXene channels. This work demonstrates the capability of MXene membranes in monovalent ion separation, which also provides a facile and general strategy to fabricate lamellar membranes in a large scale.