{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T21:16:49Z","timestamp":1791667009226,"version":"4.3.4"},"reference-count":61,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2023,9,22]],"date-time":"2023-09-22T00:00:00Z","timestamp":1695340800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"ERANET","award":["327334"],"award-info":[{"award-number":["327334"]}]},{"name":"ACT 3","award":["327334"],"award-info":[{"award-number":["327334"]}]},{"name":"Department of Energy Security and Net Zero (UK)","award":["327334"],"award-info":[{"award-number":["327334"]}]},{"name":"Ministry of University and Research (IT)","award":["327334"],"award-info":[{"award-number":["327334"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>The search for alternative ways to give a second life to materials paved the way for detailed investigation into three silica-polyethylenimine (Si-PEI) materials for the purpose of CO2 adsorption in carbon capture and storage. A solvent extraction procedure was investigated to recover degraded PEIs and silica, and concomitantly, pyrolysis was evaluated to obtain valuable chemicals such as alkylated pyrazines. An array of thermal (TGA, Py-GC-MS), mechanical (rheology), and spectroscopical (ATR-FTIR, 1H-13C-NMR) methods were applied to PEIs extracted with methanol to determine the relevant physico-chemical features of these polymers when subjected to degradation after use in CO2 capture. Proxies of degradation associated with the plausible formation of urea\/carbamate moieties were revealed by Py-GC-MS, NMR, and ATR-FTIR. The yield of alkylpyrazines estimated by Py-GC-MS highlighted the potential of exhausted PEIs as possibly valuable materials in other applications.<\/jats:p>","DOI":"10.3390\/ijms241914415","type":"journal-article","created":{"date-parts":[[2023,9,22]],"date-time":"2023-09-22T03:44:42Z","timestamp":1695354282000},"page":"14415","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Valorization Strategies in CO2 Capture: A New Life for Exhausted Silica-Polyethylenimine"],"prefix":"10.3390","volume":"24","author":[{"given":"Irene","family":"Coralli","sequence":"first","affiliation":[{"name":"Department of Chemistry \u201cGiacomo Ciamician\u201d, University of Bologna, Technopole of Rimini, Via Dario Campana 71, 47922 Rimini, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5923-7836","authenticated-orcid":false,"given":"Demetra","family":"Giuri","sequence":"additional","affiliation":[{"name":"Department of Chemistry \u201cGiacomo Ciamician\u201d, University of Bologna, Technopole of Rimini, Via Dario Campana 71, 47922 Rimini, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3273-5303","authenticated-orcid":false,"given":"Lorenzo","family":"Spada","sequence":"additional","affiliation":[{"name":"Department of Chemistry \u201cGiacomo Ciamician\u201d, University of Bologna, Technopole of Rimini, Via Dario Campana 71, 47922 Rimini, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1932-9741","authenticated-orcid":false,"given":"Jacopo","family":"Ortolani","sequence":"additional","affiliation":[{"name":"Department of Industrial Chemistry \u201cToso Montanari\u201d, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3528-6729","authenticated-orcid":false,"given":"Laura","family":"Mazzocchetti","sequence":"additional","affiliation":[{"name":"Department of Industrial Chemistry \u201cToso Montanari\u201d, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6310-2704","authenticated-orcid":false,"given":"Claudia","family":"Tomasini","sequence":"additional","affiliation":[{"name":"Department of Chemistry \u201cGiacomo Ciamician\u201d, University of Bologna, Technopole of Rimini, Via Dario Campana 71, 47922 Rimini, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lee A.","family":"Stevens","sequence":"additional","affiliation":[{"name":"Faculty of Engineering, University of Nottingham, The Energy Technologies Building, Nottingham NG7 2TU, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Colin E.","family":"Snape","sequence":"additional","affiliation":[{"name":"Faculty of Engineering, University of Nottingham, The Energy Technologies Building, Nottingham NG7 2TU, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniele","family":"Fabbri","sequence":"additional","affiliation":[{"name":"Department of Chemistry \u201cGiacomo Ciamician\u201d, University of Bologna, Technopole of Rimini, Via Dario Campana 71, 47922 Rimini, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,9,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1704","DOI":"10.1073\/pnas.0812721106","article-title":"Irreversible Climate Change Due to Carbon Dioxide Emissions","volume":"106","author":"Solomon","year":"2009","journal-title":"Proc. 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