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<p>Poplar wood was employed as the precursor to develop a coupled “microwave self-gasification &amp; aqueous post-modification” protocol that enables instantaneous activation within a microwave field, yielding activated carbon dominated by ultra-micropores (&lt; 0.7&#xa0;nm). Despite a modest BET surface area of ~ 900&#xa0;m²/g, the material exhibits an exceptional CO₂ uptake of 180.4&#xa0;mg/g at 0&#xa0;°C and 1&#xa0;bar—1.6-fold higher than at 25&#xa0;°C—while N₂ uptake remains below 30&#xa0;mg/g under the same conditions. On a pore-volume basis, the carbon stores 443.79&#xa0;mg CO₂ per cm³ at 0&#xa0;°C and 278.62&#xa0;mg/cm³ at 25&#xa0;°C. CO₂ adsorption proceeds via a multilayer mechanism with the isosteric heat (Qst) decreasing from 45 to 23&#xa0;kJ mol⁻¹, whereas N₂ follows a monolayer pathway with Qst held between 20 and 24&#xa0;kJ mol⁻¹. IAST calculations reveal that CO₂/N₂ selectivity rises from 70 to 90 with increasing pressure at 0&#xa0;°C and levels off around 50 at 25&#xa0;°C. Dynamic breakthrough experiments deliver a separation factor of 8.28 for a 15% CO₂/85% N₂ mixture. GCMC simulations further indicate that O–C = O-functionalized surfaces confer the highest CO₂ capacity, while C–S–C motifs are the least favorable in competitive adsorption.</p>

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Microwave-DES activation of poplar-derived ultramicroporous carbon for efficient CO2/N2 separation with extremely high pore utilization rate

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Hongliang Sheng,
  • Tao He,
  • Ye Li,
  • Chengyang Cao,
  • Song He

摘要

Poplar wood was employed as the precursor to develop a coupled “microwave self-gasification & aqueous post-modification” protocol that enables instantaneous activation within a microwave field, yielding activated carbon dominated by ultra-micropores (< 0.7 nm). Despite a modest BET surface area of ~ 900 m²/g, the material exhibits an exceptional CO₂ uptake of 180.4 mg/g at 0 °C and 1 bar—1.6-fold higher than at 25 °C—while N₂ uptake remains below 30 mg/g under the same conditions. On a pore-volume basis, the carbon stores 443.79 mg CO₂ per cm³ at 0 °C and 278.62 mg/cm³ at 25 °C. CO₂ adsorption proceeds via a multilayer mechanism with the isosteric heat (Qst) decreasing from 45 to 23 kJ mol⁻¹, whereas N₂ follows a monolayer pathway with Qst held between 20 and 24 kJ mol⁻¹. IAST calculations reveal that CO₂/N₂ selectivity rises from 70 to 90 with increasing pressure at 0 °C and levels off around 50 at 25 °C. Dynamic breakthrough experiments deliver a separation factor of 8.28 for a 15% CO₂/85% N₂ mixture. GCMC simulations further indicate that O–C = O-functionalized surfaces confer the highest CO₂ capacity, while C–S–C motifs are the least favorable in competitive adsorption.