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Through pyrolysis and CO2 activation, tyre rubber is converted into porous carbonaceous materials with surface properties suited for rare earth element adsorption. The study also examines the efficiency of leaching rare earth elements from NdFeB magnets using optimised acid leaching methods, providing insights into recovery processes. The adsorption capacity of the materials was assessed through batch adsorption assays targeting neodymium (Nd3\u207a) and dysprosium (Dy3\u207a) ions. Results highlight the superior performance of activated carbon derived from tyre rubber following CO2 activation, with the best-performing adsorbent achieving maximum uptake capacities of 24.7 mg\u00b7g\u207b1 for Nd3\u207a and 34.4 mg\u00b7g\u207b1 for Dy3\u207a. Column studies revealed efficient adsorption of Nd3\u207a and Dy3\u207a from synthetic and real magnet leachates with a maximum uptake capacity of 1.36 mg\u00b7g\u207b1 for Nd3\u207a in real leachates and breakthrough times of 25 min. Bi-component assays showed no adverse effects when both ions were present, supporting their potential for simultaneous recovery. Furthermore, the adsorbents effectively recovered rare earth elements from e-waste magnet leachates, demonstrating practical applicability. This research underscores the potential of tyre rubber-derived adsorbents to enhance sustainability in critical raw material supply chains. By repurposing waste tyre rubber, these materials offer a sustainable solution for rare earth recovery, addressing resource scarcity while aligning with circular economy principles by diverting waste from landfills and creating value-added products.<\/jats:p>","DOI":"10.3390\/molecules30010092","type":"journal-article","created":{"date-parts":[[2025,1,2]],"date-time":"2025-01-02T10:32:26Z","timestamp":1735813946000},"page":"92","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Recovery of Nd3+ and Dy3+ from E-Waste Using Adsorbents from Spent Tyre Rubbers: Batch and Column Dynamic Assays"],"prefix":"10.3390","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0505-6332","authenticated-orcid":false,"given":"Miguel","family":"Nogueira","sequence":"first","affiliation":[{"name":"LAQV\/REQUIMTE, Associated Laboratory for Green Chemistry, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]},{"given":"In\u00eas","family":"Matos","sequence":"additional","affiliation":[{"name":"LAQV\/REQUIMTE, Associated Laboratory for Green Chemistry, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5823-6636","authenticated-orcid":false,"given":"Maria","family":"Bernardo","sequence":"additional","affiliation":[{"name":"LAQV\/REQUIMTE, Associated Laboratory for Green Chemistry, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1014-568X","authenticated-orcid":false,"given":"Filomena","family":"Pinto","sequence":"additional","affiliation":[{"name":"UBB-LNEG, Bioenergy and Biorrefineries Unit, Laborat\u00f3rio Nacional de Energia e Geologia, 1649-038 Lisboa, Portugal"}]},{"given":"Isabel","family":"Fonseca","sequence":"additional","affiliation":[{"name":"LAQV\/REQUIMTE, Associated Laboratory for Green Chemistry, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7862-7477","authenticated-orcid":false,"given":"Nuno","family":"Lapa","sequence":"additional","affiliation":[{"name":"LAQV\/REQUIMTE, Associated Laboratory for Green Chemistry, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2024,12,29]]},"reference":[{"key":"ref_1","unstructured":"European Commission (2023). 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