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<p>The urgent need to mitigate anthropogenic CO<sub>2</sub> emissions has driven the advancement of various carbon capture technologies, with solid adsorbents emerging as a key focus. Among them, activated carbons (ACs) are particularly attractive due to their excellent adsorption capacity, thermal stability, and cost-effectiveness, making them well-suited for industrial-scale applications. However, achieving high CO<sub>2</sub> selectivity in biomass-derived ACs remains a significant challenge, requiring precise control over pore structure and surface functionality. In this study, nanoporous ACs were synthesized from palm leaves using phosphoric acid (H<sub>3</sub>PO<sub>4</sub>), potassium hydroxide (KOH), and sodium bicarbonate (NaHCO<sub>3</sub>) as activating agents, achieving optimized pore sizes (&lt; 2&#xa0;nm). Different Characterization techniques were employed to assess the properties of the prepared ACs. Morphological analysis results indicate that the AC-P-H<sub>3</sub>PO<sub>4</sub> exhibits a honeycomb structure with abundant pores, enabling CO<sub>2</sub> capture (up to 1.42 mmol/g) with a selectivity of up to 44.3, surpassing other reported ACs. Isosteric heat of adsorption (Q<sub>st</sub> values = 22–27&#xa0;kJ/mol) measurements demonstrate that CO<sub>2</sub> adsorption occurs primarily via physisorption, suggesting lower energy requirements for regeneration. Additionally, performance indicators for a cyclic vacuum swing adsorption (VSA) process were evaluated, highlighting the practical suitability of these nanoporous ACs for CO<sub>2</sub> capture applications. ACs exhibited a CO<sub>2</sub> working capacity of up to 0.97 mmol/g and regenerability of up to 81%.</p>

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Tailoring nanoporous activated carbons from palm leaf biomass for high performance and selective CO2 capture

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Muhammad Amin,
  • Mosim Ansari,
  • Abuzar Khan,
  • Muhammad Usman,
  • Aasif Helal,
  • M. Nasiruzzaman Shaikh,
  • Saleh Mohammed AlMansour,
  • Mohd Yusuf Khan

摘要

The urgent need to mitigate anthropogenic CO2 emissions has driven the advancement of various carbon capture technologies, with solid adsorbents emerging as a key focus. Among them, activated carbons (ACs) are particularly attractive due to their excellent adsorption capacity, thermal stability, and cost-effectiveness, making them well-suited for industrial-scale applications. However, achieving high CO2 selectivity in biomass-derived ACs remains a significant challenge, requiring precise control over pore structure and surface functionality. In this study, nanoporous ACs were synthesized from palm leaves using phosphoric acid (H3PO4), potassium hydroxide (KOH), and sodium bicarbonate (NaHCO3) as activating agents, achieving optimized pore sizes (< 2 nm). Different Characterization techniques were employed to assess the properties of the prepared ACs. Morphological analysis results indicate that the AC-P-H3PO4 exhibits a honeycomb structure with abundant pores, enabling CO2 capture (up to 1.42 mmol/g) with a selectivity of up to 44.3, surpassing other reported ACs. Isosteric heat of adsorption (Qst values = 22–27 kJ/mol) measurements demonstrate that CO2 adsorption occurs primarily via physisorption, suggesting lower energy requirements for regeneration. Additionally, performance indicators for a cyclic vacuum swing adsorption (VSA) process were evaluated, highlighting the practical suitability of these nanoporous ACs for CO2 capture applications. ACs exhibited a CO2 working capacity of up to 0.97 mmol/g and regenerability of up to 81%.