Enhanced CO₂ capture efficiency applying amine-based nano magnetite/sulfinol-M nano solvents at high pressures

Recently, extensive researches were performed on carbon dioxide (CO₂) capture using nano solvents. In this study, three different modified magnetic nanoparticles (NPs), including Fe₃O₄-Proline (Fe₃O₄-P), Fe₃O₄-Lysine (Fe₃O₄-L), and Fe₃O₄@SiO₂-NH₂ NPs were produced to alter and enhance the properties of Fe₃O₄ NPs for CO₂ capture in sulfinol-M as a base solvent. CO₂ capture experiments were carried out in a high-pressure batch apparatus in which CO₂ absorbed into sulfinol/nano-sulfinol. The influences of NP type, NP loading, and gas phase pressure on CO₂ capture were studied. Based on the obtained results, Fe₃O₄-L and Fe₃O₄@SiO₂-NH₂ NPs are notably capable on increasing the CO₂ capture capacity of sulfinol-M, and they improved CO₂ capture up to 6.3% and 13.36% as compared with the base fluid. Moreover, experiments indicated that all nanosolutions have higher CO₂ capture efficiency at higher pressures. Eventually, the effect of NPs stability on CO₂ capture was investigated and discussed.