CARBON DIOXIDE ADSORPTION BY MCM-41 SYNTHESIZED FROM RICE HUSK

摘要

Carbon dioxide (CO_2) adsorption at various temperatures by the hexagonal ordered mesoporous synthesized from rice husk silica (R-MCM-41) was studied. The synthesized R-MCM-41 was confirmed by X-ray diffraction pattern and micrograph. FTIR analysis indicated the presence of well arranged siloxane bonding. R-MCM-41 showed type IV adsorption isotherm with hysteresis loop according to IUPAC classification. BET surface area, pore volume, and pore size distribution was 602.28 m~2/g, 0.486 cm~3/g, and 2.43 nm, respectively. The CO_2 adsorption capacity of R-MCM-41 was investigated by using thermogravimetric analyzer (TGA) with temperatures varying from 30 to 150°C. The maximum adsorption capacity (23.32 mg-CO_2/gasorbent) was obtained at 30°C. The adsorption capacity was decreased significantly when the adsorption temperature was increased. Furthermore, R-MCM-41 showed high stability in absorption-desorption reuse cycle. These results indicate that rice husk can be used as a source of silica for MCM-41 synthesis and further applied for CO_2 adsorption in carbon capture technology.