Accelerated CO2 capture with controllable mineralisation via reactive bubble formation
2025
Su-Ho Ahn | Duckshin Park | Bo-Sang Kim | Su-Min Lee | Mang Muan Lian | Younghee Jang | Kyunghoon Kim | Sangwon Ko | Byung-Hyun Park | Jinsik Choi | Seungkyu Shin | Junpyo Cho | Liguang Wang | Hangil Park | Jung-Ho Yun
Carbon Capture and Utilisation (CCU) is crucial for mitigating greenhouse gas emissions from coal-fired power plants. This study presents a bubble reactor system using sodium carbonate (Na2CO3) and frothing reagents to improve both efficiency and sustainability. Various glycol-based polymers, along with an alcohol-based surfactant widely used in the mining and minerals industry, were evaluated for their effects on carbon dioxide (CO2) bubble size and removal efficiency. The results demonstrate that the frothing reagents not only reduced bubble size but also increased foam layer thickness, significantly improving CO2 removal efficiency. The thicker foam layer associated with the glycol-type polymers generates a larger interfacial area and longer gas residence time, accounting for the differences in CO2 removal efficiency. Furthermore, after removing CO2, the captured CO2 was mineralised into calcium carbonate (CaCO3). Notably, the calcium carbonate existed predominantly in the form of vaterite and the abundance and morphology of vaterite changed with adding one of the polymers into the CO2-loaded Na2CO3 solution. This paper underscores the potential for scalable, sustainable CCU, along with the formation of valuable by-products.
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