ArticleScience advances2026
Electrochemically tailored ion-trapping nanoarchitectures in COF membranes for selective monovalent/divalent ion sieving.
Article in Science advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The efficient separation of monovalent and divalent ions remains a core challenge in desalination and ion resource recovery. Here, we propose an electrochemical confinement strategy to spatially organize EDTA into aligned arrays within the one-dimensional transport channels of TFP-Tag membrane with a pore size of 1.1 nm. This structure establishes a biomimetic, gradient-functionalized conical nanochannel. The negatively charged upper channel regions capture and block divalent ions, while the lower regions with their larger pore size and an anion-affinitive local environment facilitate monovalent ion transport, thereby achieving highly selective monovalent/divalent ion separation. The membrane exhibits outstanding monovalent/divalent ion separation performance in multi-ion mixed solutions, with Na
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