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Although promising for adsorption, many high\u2010surface\u2010area polymer materials cannot be easily processed into freestanding membranes or packed bed columns, due to poor solution processability and high back pressures, respectively. The preparation of hybrid membranes comprising sulfonated hypercrosslinked polymers entrapped in nanocellulose papers is described. The hybrid membranes are effective for simultaneous ultrafiltration and ion exchange. Increasing the polymer loading of the hybrid membrane produces synergy by increasing the permeance of the membranes while enhancing the ion adsorption capacity to values exceeding those of bulk hypercrosslinked polymers. The maximum ion adsorption capacity for copper is determined to be \u2248100\u2009mg\u2009g<jats:sup>\u22121<\/jats:sup> outperforming that of pure polymer (71\u2009mg\u2009g<jats:sup>\u22121<\/jats:sup>) and commercially available ion exchange resins. Competitive adsorption is tested in samples containing water hardness elements and trace toxic metal ions showing high ion\u2010exchange capacities. Even when fully loaded with water hardness elements, Ba<jats:sup>2+<\/jats:sup> and Sr<jats:sup>2+<\/jats:sup> are still removed from solution.<\/jats:p>","DOI":"10.1002\/smsc.202400182","type":"journal-article","created":{"date-parts":[[2024,8,12]],"date-time":"2024-08-12T06:54:36Z","timestamp":1723445676000},"source":"Crossref","is-referenced-by-count":7,"title":["Best of Both Worlds: Adsorptive Ultrafiltration Nanocellulose\u2010Hypercrosslinked Polymer Hybrid Membranes for Metal Ion Removal"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4934-1896","authenticated-orcid":false,"given":"Florian","family":"Mayer","sequence":"first","affiliation":[{"name":"Institute of Materials Chemistry and Research Faculty of Chemistry University of Vienna  Waehringer Stra\u00dfe 42 1090 Vienna 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