Ultrathin b-Oriented Co-Gallate MOF Membranes for Lithium Recovery: Precise Ion Sieving via Geometry-Confined Dehydration.

Authors

Yanwei Sun, Yufan Yang, Tianhao Wang, Xiatong Shao, Jiashu Lu

Published in

Angewandte Chemie (International ed. in English). Pages e7674294. Oct 05, 2026. Epub Oct 05, 2026.

Abstract

Selective K⁺ over Li⁺ separation is indispensable for lithium recovery from salt-lake brines, whereas simultaneous high-efficiency separation of K⁺ from interfering Na⁺ and Mg²⁺ cations remains challenging for pristine MOF membranes. Herein, an ultrathin b-oriented Co-gallate MOF membrane is fabricated using a gas-liquid interfacial soft-template approach. The membrane possesses 3D interconnected zigzag subnanochannels (≈3.7 Å) that impose geometry-confined ion dehydration, hindering the transport of Li⁺, Na⁺, and Mg²⁺ far more significantly than K⁺, as corroborated by molecular dynamics simulations. Under a concentration gradient driving force, the ub-CoG membrane achieves a prominent K⁺/Li⁺ selectivity of 13.5, as well as excellent K⁺/Na⁺ and K⁺/Mg²⁺ sieving capability. The recorded K⁺/Li⁺ selectivity stands as the highest value among MOF ion-sieving membranes. This interfacial orientation strategy provides a promising pathway to advanced ion-sieving membranes for multicomponent industrial brine lithium extraction.

PMID:
42831873
Bibliographic data and abstract were imported from PubMed on 05 Oct 2026.

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