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, H-1-C-13-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.
Valorization Strategies in CO2 Capture: A New Life for Exhausted Silica-Polyethylenimine / Coralli, Irene; Giuri, Demetra; Spada, Lorenzo; Ortolani, Jacopo; Mazzocchetti, Laura; Tomasini, Claudia; Stevens, Lee A; Snape, Colin E; Fabbri, Daniele. - In: INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES. - ISSN 1661-6596. - ELETTRONICO. - 24:19(2023), pp. 1-15. [10.3390/ijms241914415]
Valorization Strategies in CO2 Capture: A New Life for Exhausted Silica-Polyethylenimine
Coralli, Irene;Giuri, Demetra
;Spada, Lorenzo
;Ortolani, Jacopo;Mazzocchetti, Laura;Tomasini, Claudia;Fabbri, Daniele
2023
Abstract
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, H-1-C-13-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.File | Dimensione | Formato | |
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28. Valorization Strategies in CO2 Capture_a new life for exhausted Si-PEI.pdf
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SI_n28_Valorization strategies_SiPEI_ijms-2565880-supplementary.pdf
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