journal article·2025-10-18Open access

Optimizing Aqueous Amine Blends for Enhanced Carbon Capture and Mineralization in Cement-Based Materials

Harshani Iresha, Yogarajah Elakneswaran, Ryoma Kitagaki, Ryoma Saito, Keiichi Yano, Yuya Yoda, Masato Tsujino, Akira Nishida, Hisanori Senboku, Koji Fushimi, Masatoshi Sakairi

Abstract

Aqueous amine-based carbon mineralization in cementitious materials is a novel and sustainable approach to carbon capture, conceptualizing cementitious structures as 'synthetic trees'. This study evaluates the effectiveness of five individual aqueous amine systems—2-(methylamino)ethanol (MAE), N-methyl diethanolamine (MDEA), 2-amino-2-methyl-1-propanol (AMP), ethylenediamine (EDA), and 2-(2-aminoethylamino)ethanol (AEEA)—as well as MAE blended with piperazine (PZ) at different PZ/MAE ratios, for carbon mineralization in calcium hydroxide (Ca(OH)2(s)) and hydrated cement paste granules (HCPG). A wet carbonation method with 5 vol.% CO2(g) bubbling was employed to assess carbonation performance. For Ca(OH)2, the MAE system exhibited the highest carbonation efficiency, while the EDA and AEEA systems showed lower carbonation than the control. In contrast, for HCPG, the AEEA and EDA systems demonstrated the highest carbonation enhancement. However, when evaluating wt.% CaCO3(s) per mole of nitrogen in the system, MAE was identified as the most efficient individual amine for carbonation. Among PZ/MAE blends, the 1:1 PZ/MAE ratio yielded the highest CaCO3 formation in both Ca(OH)₂ and HCPG carbonation. XRD quantitative phase analysis of HCPG revealed significant decalcification of C-S-H in the AEEA system, predicting poor durability upon AEEA-assisted carbonation. Overall, the findings demonstrate the potential of aqueous amines and amine blends in cementitious materials for effective carbon capture and mineralization.
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Research context

OpenAlex topics: Catalysis and Hydrodesulfurization Studies · Zeolite Catalysis and Synthesis · Catalysis for Biomass Conversion

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Affiliations

Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628, Japan.

Division of Architecture, Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628, Japan.

Shimizu Corporation, Shimizu Institute of Technology, 3 Chome-4-17 Etchujima, Koto Ward, Tokyo 135-8530, Japan.

Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628, Japan.

Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo, 060-8628, Japan.

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