This study aimed to verify CO2 reduction and morphological control of its precipitates by applying the CO2 mineralization mechanism under ambient conditions. In the first stage, CO2 absorption-conversion experiments were performed using three types of amines (mono-ethanolamine, MEA; di-ethanolamine, DEA; and methyl-di-ethanolamine, MDEA) to improve the rate and efficiency of CO2 conversion into metal carbonates. In the second stage, CO2 was re-absorbed and supplied as aqueous CO2, forming MgCO3 and MgCO3(H2O)(3) precipitates. The formed MgCO3 was analyzed by X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM). In particular, MgCO3 was formed only in the MEA solution although other amines were exposed to the same experimental conditions. Therefore, the results showed that the CO2 precipitate morphology could be controlled by the type of the conversion solution used. This study has significance regarding CO2 reduction and utilization because the emitted CO2 could be stored semi-permanently. Furthermore, the formed MgCO3 could be re-used in various industries through morphology control. Therefore, this study verified the potential of the CO2 mineralization mechanism for CO2 reduction and morphology control. (C) 2018 Elsevier Ltd. All rights reserved.