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Surface chemistry-mediated porewater fluctuations boost CO2 docking in calcium silicate hydrates

Author

Listed:
  • Gen Li

    (The Hong Kong Polytechnic University)

  • Yong Tao

    (The Hong Kong Polytechnic University)

  • Yining Gao

    (The Hong Kong Polytechnic University)

  • Roland J.-M. Pellenq

    (Institut Européen des Membranes, CNRS and Université of Montpellier)

  • Peiliang Shen

    (The Hong Kong Polytechnic University)

  • Xiong Qian

    (The Hong Kong Polytechnic University)

  • Chi Sun Poon

    (The Hong Kong Polytechnic University)

Abstract

While CO2 mineralization using carbonatable binders and solid waste has become an overwhelming trend in laboratory and industrial trials, a lack of fundamental understanding of the underlying carbonation mechanisms hinders advancement of carbonation technology for large-scale applications. This study addresses this gap by employing Grand Canonical Monte Carlo simulations to unravel the optimal CO2 sequestration conditions within the mesopores of calcium silicate hydrates, a ubiquitous component of construction materials. Here we show that CO2-surface interactions dominate at low relative humidity (RH), while CO2-water interactions prevail at high RH, maximizing CO2 uptake during capillary condensation, where the metastable porewater boosts CO2 dissolution. Furthermore, we reveal the influence of surface hydrophilicity on the critical RH for optimal carbonation, indicating that less hydrophilic minerals require higher optimal carbonation RH. These insights into the complex CO2-water-surface interactions within minerals’ mesopores provide a foundation for developing effective CO2 mineralization strategies and advancing our understanding of geochemical carbonation processes.

Suggested Citation

  • Gen Li & Yong Tao & Yining Gao & Roland J.-M. Pellenq & Peiliang Shen & Xiong Qian & Chi Sun Poon, 2025. "Surface chemistry-mediated porewater fluctuations boost CO2 docking in calcium silicate hydrates," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-62580-6
    DOI: 10.1038/s41467-025-62580-6
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    References listed on IDEAS

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    1. Fuentes-Azcatl, Raúl & Mendoza, Noé & Alejandre, José, 2015. "Improved SPC force field of water based on the dielectric constant: SPC/ε," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 420(C), pages 116-123.
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    3. Gen Li & Yong Tao & Xinping Zhu & Yining Gao & Peiliang Shen & Binbin Yin & Romain Dupuis & Katerina Ioannidou & Roland J.-M. Pellenq & Chi Sun Poon, 2024. "Optimal CO2 intake in metastable water film in mesoporous materials," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
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