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However, the fabrication of stable metal oxide hydrogels in aqueous media is severely hindered by rapid metal ion hydrolysis and unstable oxide\u2010water interfaces, leading to structural disintegration. Here, we developed a two\u2010step, solvent\u2010mediated self\u2010assembly strategy to fabricate a robust 3D Y\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    \/Y(OH)\n                    <jats:sub>3<\/jats:sub>\n                    heterogeneous nanosheets hydrogel (3D\u2010YHNH) for metal resource recovery. The 3D\u2010YHNH shows exceptional adsorption performance, exhibits high capacities of 594.5\u00a0mg g\n                    <jats:sup>\u22121<\/jats:sup>\n                    for CrO\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>2\u2212<\/jats:sup>\n                    and 155.3\u00a0mg g\n                    <jats:sup>\u22121<\/jats:sup>\n                    for Au(III), coupled with ultra\u2010rapid adsorption equilibrium kinetics achieved in 2\u00a0min. The 3D\u2010YHNH demonstrated exceptional durability, retaining 99.2% of its initial capacity after 100 consecutive cycles. Combined experimental results and DFT calculations reveal that the exposure of active sites and formation of interfacial defects within 3D\u2010YHNH generate substantial structural positive charges, resulting in enhanced electrostatic interactions with CrO\n                    <jats:sub>4<\/jats:sub>\n                    <jats:sup>2\u2212<\/jats:sup>\n                    anions. Successful demonstration of kilogram\u2010scale preparation, together with concentration factors up to 572.6 of Cr(VI) from wastewater and 48.20 of Au(III) from kilogram\u2010scale e\u2010waste, suggests that 3D\u2010YHNH is compatible with industrial deployment. This finding paves the way for sustainable technologies for recovering valuable metals, directly supporting circular economy initiatives.\n                  <\/jats:p>","DOI":"10.1002\/anie.4614735","type":"journal-article","created":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T23:46:28Z","timestamp":1790811988000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Self\u2010Assembled Y\n                    <sub>2<\/sub>\n                    O\n                    <sub>3<\/sub>\n                    \/Y(OH)\n                    <sub>3<\/sub>\n                    Heterojunction Nanosheets Hydrogel for Efficient Metal Resources Recovery"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8020-7495","authenticated-orcid":false,"given":"Jianzhong","family":"Zheng","sequence":"first","affiliation":[{"name":"School of Environmental Science and Engineering Nanjing Tech University Nanjing P. R. 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