Abstract
Multi-walled carbon nanotube (MWCNT) enhanced 1-hexyl-3-methyl-imidazolium cation-based room temperature ionic liquids (RTILs) with different anions were investigated for CO2 capture. Besides, the viscosity, surface tension, and thermal stability of the samples were also investigated. Moreover, the behavior of CO2 bubbles captured and analyzed. Among various pristine RTILs, [HMIM][Tf2N] exhibited better CO2 capture capability compared to other ionic liquids; hence, MWCNT/[HMIM][Tf2N] nanoparticle enhanced ionic liquids (NEILs) were prepared and tested for CO2 absorption. As a result, the highest CO2 absorption capability or pressure reduction was observed at the pressure and MWCNT nanoparticles concentration of 1 MPa and 0.05 wt%, respectively. At the system pressure of 0.35, 0.6, and 1 MPa, the CO2 absorption capacities of 16.17%, 23.13%, and 31.30% were obtained at the temperature of 20 oC, 50 oC, and 20 oC, respectively, for 0.05 wt% MWCNT/[HMIM][Tf2N] NEIL. Furthermore, it was deduced that the effect of pressure and MWCNT nanoparticle concentration was superior to the temperature effect on the CO2 absorption capability of MWCNT/[HMIM][Tf2N] NEILs.
