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<p>Current carbon capture technologies face a critical tradeoff between CO<sub>2</sub> absorption capacity and regeneration energy requirements. Here we present an approach to reduce the regeneration energy load by utilizing tris(hydroxymethyl)aminomethane (Tris) as a thermally responsive pH regulator in aqueous carbonate solutions. By leveraging the temperature-dependent equilibrium constant of Tris, our system achieves enhanced CO<sub>2</sub> absorption under ambient conditions and enables low-temperature CO<sub>2</sub> desorption (≤60 °C, 1 atm) through controlled pH swings. A continuous-flow reactor demonstrates the efficient concentration of diluted CO<sub>2</sub> streams (1–5%) to high-purity products with low energy inputs (even solely with natural sunlight), high stability (&gt;240 h) and promising economic viability. This work represents a sustainable carbon capture technology that offers a practical pathway for industrial-scale implementation while minimizing energy penalties associated with traditional CO<sub>2</sub> capture processes.</p><p></p>

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Enhancing continuous-flow CO2 capture and release from aqueous carbonates via thermal pH regulation

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • Youhong Guo,
  • T. Alan Hatton

摘要

Current carbon capture technologies face a critical tradeoff between CO2 absorption capacity and regeneration energy requirements. Here we present an approach to reduce the regeneration energy load by utilizing tris(hydroxymethyl)aminomethane (Tris) as a thermally responsive pH regulator in aqueous carbonate solutions. By leveraging the temperature-dependent equilibrium constant of Tris, our system achieves enhanced CO2 absorption under ambient conditions and enables low-temperature CO2 desorption (≤60 °C, 1 atm) through controlled pH swings. A continuous-flow reactor demonstrates the efficient concentration of diluted CO2 streams (1–5%) to high-purity products with low energy inputs (even solely with natural sunlight), high stability (>240 h) and promising economic viability. This work represents a sustainable carbon capture technology that offers a practical pathway for industrial-scale implementation while minimizing energy penalties associated with traditional CO2 capture processes.