CO_2 (carbon dioxide) fixation by applying new chemical absorption-precipitation methods

摘要

CO_2 (carbon dioxide) is the most common greenhouse gas and most of it is emitted from human activities. The methods for CO_2 emission reduction can be divided into physical, chemical, and biochemical methods. Among the physical and chemical methods, CCS (carbon capture and storage) is a well-known reducing technology. However, this method has many disadvantages including the required storage area. In general, CCS requires capture and storage processes. In this study, we propose a method for reusing the absorbed CO_2 either in nature or in industry. The emitted CO_2 was converted into CO_3~(2-) using a conversion solution, and then made into a carbonate by combining the conversion solution with metal ions at normal temperature and pressure. The resulting carbonate was analyzed using FT-IR (Fourier transform infrared spectroscopy) and XRD (X-ray diffraction). We verified the formation of a solid consisting of calcite and vaterite. In addition, the conversion solution that was used could be reused in the same process of CCS technology. Our study demonstrates a successful method of reducing and reusing emitted CO_2, thereby making CO_2 a potential future resource.