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<p>In this study, a sustainable activated carbon (AC-CH) was synthesised from <i>Chamaerops humilis</i> biomass by chemical activation with phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) with the aim of efficient carbon dioxide (CO₂) capture. Response surface methodology (RSM) was used to optimise the preparation parameters, namely impregnation time (8–24&#xa0;h), activation temperature (550–750&#xa0;°C) and impregnation ratio (1:1 to 3:1). The optimal material exhibited a high specific surface area (600 m<sup>2</sup>/g) and a maximum adsorption capacity of CO₂ reaching 115&#xa0;mg/g. The study of isotherms showed that Toth’s model best fits the experimental data, indicating a monomolecular-type adsorption on heterogeneous surface. In addition, DFT analyses highlighted the interaction mechanisms between CO₂ molecules and activated carbon functional groups, identifying active sites favourable to adsorption. The combination of experimental and theoretical approaches confirms the potential of AC-CH carbon as a low-cost, high-performance biosourced adsorbent for industrial CO₂ capture applications.</p>

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Sustainable CO₂ capture using phosphoric acid-activated carbon from the novel biomass Chamaerops humilis: experimental optimization, characterization and DFT insight into the adsorption mechanism

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Mohssine Ghazoui,
  • Otmane Boudouch,
  • Rajaa Zahnoune,
  • Aboubacar Sidigh Sylla,
  • Nabil Boukhrissi,
  • Mohamed Oubaouz,
  • Sudip Chakraborty,
  • Reda Elkacmi

摘要

In this study, a sustainable activated carbon (AC-CH) was synthesised from Chamaerops humilis biomass by chemical activation with phosphoric acid (H3PO4) with the aim of efficient carbon dioxide (CO₂) capture. Response surface methodology (RSM) was used to optimise the preparation parameters, namely impregnation time (8–24 h), activation temperature (550–750 °C) and impregnation ratio (1:1 to 3:1). The optimal material exhibited a high specific surface area (600 m2/g) and a maximum adsorption capacity of CO₂ reaching 115 mg/g. The study of isotherms showed that Toth’s model best fits the experimental data, indicating a monomolecular-type adsorption on heterogeneous surface. In addition, DFT analyses highlighted the interaction mechanisms between CO₂ molecules and activated carbon functional groups, identifying active sites favourable to adsorption. The combination of experimental and theoretical approaches confirms the potential of AC-CH carbon as a low-cost, high-performance biosourced adsorbent for industrial CO₂ capture applications.