The reduction of CO2 emission is essential. In the present work, CaSiO3 was prepared through a solid chemical reaction of CaCO3 and SiO2 at 800 degrees C and investigated as a CO2 sorbent via X-ray diffraction (XRD) and thermal gravimetric analysis (TGA) techniques, realizing that CaSiO3 commenced to absorb CO2 at 400 degrees C and ended at 800 degrees C with about 28.72% CO2 sorption efficiency while using 15% CO2, 85% N-2 as flow gases. CO2 sorption-desorption cycles were also exhibited well. CaSiO3 can be regenerated by calcination at 800 degrees C for sufficient time; furthermore, the cheap CaSiO3 can also be used to capture CO2 eternally. (c) 2008 Elsevier Ltd. All rights reserved.