Abstract
Choline/amino acid-based ionic liquids were synthetized via ionic metathesis and their CO2 absorption performances evaluated by employing different experimental approaches. In order to overcome any viscosity-related problem, dimethyl sulfoxide (DMSO) was employed as solvent. IL-DMSO solutions with different IL concentrations were evaluated as absorbents for CO2, also investigating their good cyclability as desirable for real industrial CO2 capture technologies. 1H-NMR and in-situ ATR-IR experiments were the toolbox to study the CO2 chemical fixation mechanism under different experimental conditions, proving the formation of distinct chemical species (carbamic acid and/or ammonium carbamate). In general, these ILs demonstrated molar uptakes higher than classical 0.5 mol CO2/mol IL and the capacity to release CO2 in extremely mild conditions. The possible biological adverse effects were also analyzed, for the first time, in zebrafish (Danio rerio) during the development, by assessing for different toxicological endpoints, proving the non-toxicity and high biocompatibility of these bio-inspired ILs.
Highlights
The atmospheric concentration of carbon dioxide (CO2) has increased due to the anthropogenic contribution overstepped 400 ppm in 2015 [1,2]
The CO2 absorption capacity of all [Cho][AA] Ionic liquids (ILs) was assessed in dimethyl sulfoxide (DMSO) solution at different concentration, by means of a gravimetric setup
The results were similar for all the amino acids tested as IL anions, all the [Cho] [AA]-DMSO solutions exhibited absorption performances significantly higher compared to literature data of pure DMSO [51]
Summary
The atmospheric concentration of carbon dioxide (CO2) has increased due to the anthropogenic contribution overstepped 400 ppm in 2015 [1,2]. Fossil fuel combustion for energy production, trans portation and industrial processes establishes the main contribution to human emission. Purification of post-combustion gases, storage and conversion/utilization of CO2 represent a straightforward measure to reduce anthropogenic emissions. Alkylamine aqueous solutions chemically fix the CO2 molecule, as shown in Scheme 1. Pri mary and secondary amines produce ammonium-carbamate species, whereas ammonium-carbonate species are formed from tertiary amine and water (see Scheme 1) [5,6,7]. The amine solution is regenerated at 100− 120 ◦C via water evaporation and the released CO2 is compressed to 100− 150 bar for sequestration and transportation [8]
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