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Greenhouse gases capture applying impregnated silica with ionic liquids, deep eutectic solvents, and natural deep eutectic solvents

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Abstract

The development of technologies to capture greenhouse gases (GHGs) like carbon dioxide (CO2) and nitrous oxide (N2O) is vital for climate change mitigation. Ionic liquids (ILs), deep eutectic solvents (DES), and natural deep eutectic solvents (NADES) are promising absorbents to abate GHGs emissions. However, their high viscosity limits the gas–liquid contact, as consequence of the mass transfer. To overcome this, their impregnation onto porous silica gel has been carried out, increasing the gas–liquid contact area. The present study analyzes the effect of size particle of silica gel impregnated with ILs, DES, and NADES over the CO2 and N2O capture at atmospheric conditions. The degree of impregnation of silica particles was determined by thermogravimetric analysis (TGA). The identification of functional groups present on the surface of silica, ILs, DES, and NADES was performed using Fourier-transform infrared spectroscopy (FTIR), and their crystalline structure was determined by X-ray diffraction (XRD). The partition coefficient of CO2 and N2O between gas and ILs, DES, and NADES was determined by a static headspace method. Results show that the degree of solvent impregnation on silica gel ranged from 36.8 to 43.0% w/w, the partition coefficient of CO2 in the impregnated silica varied from 0.005 to 0.067, and for N2O, from 0.005 to 0.032. This suggests that impregnated particles have a greater affinity for N2O compared to CO2. Using impregnated particles requires only 40% of the bulk solvent to achieve a similar GHG capture capacity compared to using bulk solvents.

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Acknowledgements

Main author, Mariana Candia, would like to thank the “CONAHCYT” for supporting her by a doctoral scholarship. Authors would like to express their gratefulness to “Centre national en électrochimie et en technologies environnementales” and “Université de Sherbrooke” for the research internship. Dr. Avalos Ramirez would thank the “Fonds de recherche du Québec” for functional funding, and the Natural Sciences and Engineering Research Council of Canada for the supplementary scholarship in the frame of its Discovery grant.

Funding

This work was supported by the “Fonds de recherche du Québec” for functional funding. Mariana Candia has received a doctoral scholarship by CONAHCYT and a supplementary scholarship in the frame of its Discovery grant of Natural Sciences and Engineering Research Council of Canada.

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Mariana Candia Lomeli, Sonia Arriaga, and Antonio Avalos Ramírez conceived the research and designed the experiments; Mariana Candia Lomeli performed the experiments. Mariana Candia Lomeli, Sonia Arriaga, and Antonio Avalos Ramírez performed the data analysis. The first draft of the manuscript was written by Mariana Candia Lomeli, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Sonia Arriaga.

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Candia-Lomeli, M., Delgado-Cano, B., Heitz, M. et al. Greenhouse gases capture applying impregnated silica with ionic liquids, deep eutectic solvents, and natural deep eutectic solvents. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33485-6

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  • DOI: https://doi.org/10.1007/s11356-024-33485-6

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