| 초록 |
Rice hull silica samples were obtained by combustion of rice hull at temperatures ranging from 500℃ to 1000℃. The silica samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray analysis, Fourier transform infrared spectroscopy (FT-IR), N2 adsorption/desorption, thermal gravimetric analysis (TGA), elemental analysis as well as CO2 adsorption performance. XRD analysis showed that the rice hull silica existed in an amorphous form when the combustion temperature of rice hull varied between 500℃ and 700℃. However, for the temperatures over 700℃, the crystalline structure of silica materials were obtained. With increasing combustion temperature of the rice hull, the surface area of rice hull silica decreased. In addition, we prepared amine-grafted rice hull silica using 3-aminopropyltriethoxysilane and investigated for CO2 adsorption. The CO2 adsorption capacity was significantly increased after grafting 3-aminopropyltriethoxysilane on rice hull silica. The desorption was complete for all the amine-grafted rice hull silica adsorbents as well as the parent rice hull silica support. |
