A Study on Grafting Efficiency of Amine and CO2 Sorption Behavior Inside Amorphous Silica

The effect of the physical properties of support materials on the performance of CO2 adsorbents was evaluated. Amine functional group was grafted covalently inside nanopore of silica having different surface area, pore diameter and pore structure. The prepared CO2 adsorbents were evaluated for its CO2 sorption capacity and their kinetics. In addition, the adsorbents were characterized by elemental analysis, BET, SEM and FT-IR. The 2NS/NPS-1 adsorbent showed the highest CO2 sorption capacity of 7 wt% and the highest grafting efficiency because of the large surface area and 3D pore structure of the NPS-1 support. CO2 sorption rate of 2NS/NPS-2 was observed to be higher than NPS-1 and n-silica because of more effective internal diffusion of CO2 inside larger pores.