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Adv."],"published-print":{"date-parts":[[2026,10,9]]},"abstract":"<jats:p>\n                    Sustainable recovery of critical resources from complex aqueous streams is constrained by membranes that fail to combine rapid ion transport with precise mono\/multivalent discrimination. Here, we report Tr\u00f6ger\u2019s base-derived porous organic polymer (POP) membranes with rigid, covalently crosslinked microporous frameworks that stabilize angstrom-scale transport channels while suppressing hydration-induced swelling. These membranes render rapid monovalent-ion transport with near-complete exclusion of multivalent cations and anions, including Mg\n                    <jats:sup>2+<\/jats:sup>\n                    , Al\n                    <jats:sup>3+<\/jats:sup>\n                    , SO\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>2\u2212<\/jats:sup>\n                    , and PO\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>3\u2212<\/jats:sup>\n                    . Experiments and simulations show that steric confinement, dehydration penalties, and electrostatic interactions cooperatively raise migration barriers for multivalent ions in confined channels. The membranes achieve comprehensive mono\/multivalent discrimination across both cationic and anionic systems. In multistage electrodialysis, they enable stage-amplified lithium enrichment from high-Mg brines with stable long-term operation and downstream recovery of crystalline Li\n                    <jats:sub>2<\/jats:sub>\n                    CO\n                    <jats:sub>3<\/jats:sub>\n                    . They also facilitate high-purity NaCl enrichment from simulated seawater. Overall, this platform offers a durable and energy-efficient route to selective resource recovery from complex aqueous streams.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.aef9368","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T18:06:59Z","timestamp":1791569219000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Hydration channel engineering in Tr\u00f6ger\u2019s base-POP membranes for mono\/multivalent cation and anion discrimination"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-5688-7521","authenticated-orcid":true,"given":"Haopan","family":"Sun","sequence":"first","affiliation":[{"name":"National Engineering Research Center for Comprehensive Utilization of Salt Lake Resources, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, 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