Industrial and technological advancement have increased global energy demand, and, consequently, elevated the emission of greenhouse gases (GHG), such as carbon dioxide (CO2) into the atmosphere. In this sense, several CO2 storage and capture technologies are investigated. One strategy is the biofixation CO2 microalgae which besides reducing gas concentration in the atmosphere, due their elevated photosynthetic activity. The chemical absorption has been used in the purification of CO2 emitted in the power plants. The use of these absorbents in microalgae cultivation may contribute to the increase of carbon concentrations in the liquid medium, as well as to increase the growth of the microorganism. In this context, this study aimed to evaluate the growth parameters of Spirulina sp. LEB 18 at different concentrations of the CO2 absorbents, diethanolamine and potassium carbonate. The chemical absorbents addition can increase the biomass concentration in 36%, productivity in 52% and halve the cell duplication time.