Formation of CaCO 3 from calcium sources with different anions in single process of CO 2 capture-mineralization
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Formation of CaCO3 from calcium sources with different anions in single process of CO2 capture-mineralization Dea Hyun Moon*, Arti Murnandari*, Omotayo Salawu**, Chan-Woo Lee**, Wonhee Lee*, Young Eun Kim*, Ki Tae Park*, Ji Eun Lee*, Jun Eo*, Soon Kwan Jeong*,†, and Min Hye Youn*,† *Climate Change Research Division, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea **Platform Technology Laboratory, Korea Institute of Energy Research (KIER), 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea (Received 2 April 2020 • Revised 14 May 2020 • Accepted 15 May 2020) AbstractThe single process CO2 capture-mineralization approach integrates methods of CO2 absorption using aqueous solvents and mineral carbonation technology to not only remove carbon dioxide quickly, but also to simultaneously produce precipitated calcium carbonate (PCC). To develop a more sustainable process, it is important to extract calcium from inexpensive raw materials such as industrial by-products. The extractant has a significant effect on the quality of the calcium carbonate produced because it determines the anion paired with the calcium cation. In this work, several calcium sources with different anions (Propionate, Acetate, Nitrate and Chloride) were applied in the single process CO2 capture-mineralization method, and their influence on the polymorph of the obtained CaCO3 was investigated. The CaCO3 produced with inorganic calcium sources predominantly exhibited a calcite structure, while the CaCO3 produced with organic calcium sources had a structure in which vaterite and calcite coexist. This result was in good agreement with our DFT calculations, which indicated the adsorption energy of the organic anions (Propionate and Acetate) were lower than the inorganic anions on the surface of vaterite. Except for chloride with its non-polar nature, in most cases, there was a strong correlation between the polymorph and the adsorption energy calculated for each surface. A mechanism for the polymorph CaCO3 formation in our single process CO2 capture-mineralization method was proposed after observing crystal formation at low concentration. Keywords: Calcium Extraction, CaCO3 Polymorphism, CO2 Carbonation, Calcium Anion, Adsorption Energy, Internal Energy
ous solvents, produces a high purity mineral carbonate. Various extractants, including steam [5], hydrochloric acid [6], ammonium chloride [7], sulfuric acid [8], acetic acid [9], and mixtures of solvent [10] have been studied, and the metal salt that can be obtained is determined by the type of extractant used. Recently, many studies have been conducted to permanently sequester carbon dioxide using various calcium sources, such as industrial by-products [7,11-13]. In particular, sustainable and reliable CCUS technologies have been proposed [14-17], which attempt to quickly capture CO2 gases and convert them into useful materials. The combination of CCS technology and mineralization has
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