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<p>The increasing levels of carbon dioxide (CO<sub>2</sub>) emissions driven by industrial activities highlight the urgent need for the development of efficient and sustainable CO<sub>2</sub> capture technologies. Biomass-derived porous carbons have emerged as promising candidates for CO<sub>2</sub> adsorption due to their low cost, high surface area, and adjustable pore structure. In this study, hierarchically porous carbons (HPCs) were synthesized from waste <i>acer truncatum</i> wood through pre-carbonization and subsequent KOH activation. The synthesis conditions, including activation temperature and activating agent concentration, were optimized to precisely tailor the pore architecture. The resulting HPC exhibited excellent CO<sub>2</sub> adsorption capacities of 7.56 mmol·g⁻<sup>1</sup> at 0&#xa0;°C and 4.29 mmol·g⁻<sup>1</sup> at 25&#xa0;°C under ambient pressure. Notably, ultramicropores (&lt; 0.7&#xa0;nm) exhibited a dominant role in CO<sub>2</sub> capture at low pressures, while narrow micropores (&lt; 1.0&#xa0;nm) contributed significantly across a range of low-pressure conditions. The hierarchical pore structure enhanced CO<sub>2</sub> uptake at higher pressures. Furthermore, the material demonstrated exceptional CO<sub>2</sub>/N<sub>2</sub> selectivity, reaching up to 112 at 0.15&#xa0;bar and 0&#xa0;°C, along with good cyclic stability, highlighting its potential in post-combustion CO<sub>2</sub> capture. This work provides a sustainable strategy for converting waste biomass into high-value adsorbents, offering a solution that addresses both environmental concerns and economic feasibility.</p>

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Sustainable waste Biomass-Derived porous carbons with superior hierarchical porosity for High-Performance CO2 capture

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Fumin Shen,
  • Shunyang Yao,
  • Yuanchao Pei,
  • Rubin Sun

摘要

The increasing levels of carbon dioxide (CO2) emissions driven by industrial activities highlight the urgent need for the development of efficient and sustainable CO2 capture technologies. Biomass-derived porous carbons have emerged as promising candidates for CO2 adsorption due to their low cost, high surface area, and adjustable pore structure. In this study, hierarchically porous carbons (HPCs) were synthesized from waste acer truncatum wood through pre-carbonization and subsequent KOH activation. The synthesis conditions, including activation temperature and activating agent concentration, were optimized to precisely tailor the pore architecture. The resulting HPC exhibited excellent CO2 adsorption capacities of 7.56 mmol·g⁻1 at 0 °C and 4.29 mmol·g⁻1 at 25 °C under ambient pressure. Notably, ultramicropores (< 0.7 nm) exhibited a dominant role in CO2 capture at low pressures, while narrow micropores (< 1.0 nm) contributed significantly across a range of low-pressure conditions. The hierarchical pore structure enhanced CO2 uptake at higher pressures. Furthermore, the material demonstrated exceptional CO2/N2 selectivity, reaching up to 112 at 0.15 bar and 0 °C, along with good cyclic stability, highlighting its potential in post-combustion CO2 capture. This work provides a sustainable strategy for converting waste biomass into high-value adsorbents, offering a solution that addresses both environmental concerns and economic feasibility.