Li4SiO4-based sorbents from diatomite with fast CO2 adsorption rate (achieving the adsorption equilibrium at about 15 min) were developed by the impregnation precipitation method at lower temperature (600 degrees C). Influence of sintering temperatures on phase composition was investigated. Phase composition and morphologies were analyzed by XRD and SEM, and CO2 adsorption properties were investigated by TG. The as-prepared Li4SiO4-based sorbents reached a higher adsorption capacity of 34.02 wt % (7.73 mmol CO2/g Li4SiO4, corresponding to 92.70% efficiency) in a mixture gas (50 rnL/min N-2 and 50 mL/min CO2). The activation energies for chemisorption (28.868 kJ/mol) and diffusion (16.563 kJ/mol) were obtained by isothermal study. Compared with our previous research results by the solid reaction method, the activation energies for these two processes decreased measurably. In addition, the as-prepared Li4SiO4-based sorbents also exhibited faster adsorption rate and better adsorption-desorption performance.