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Microwave-DES activation of poplar-derived ultramicroporous carbon for efficient CO2/N2 separation with extremely high pore utilization rate KCI 등재
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/452975
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.
Abstract
1 Introduction
2 Materials and methods
2.1 Materials
2.2 Creation of activated carbon
2.3 Characteristics
2.4 GCMC simulation
3 Results
3.1 Thermal stability analysis
3.2 Pore structure regulation analysis
3.3 Elemental analysis
3.4 Material structure characterization
3.5 Sorption
3.5.1 Static adsorption
3.5.2 Adsorption isotherm fitting
3.5.3 Adsorption heat
3.5.4 IAST adsorption selectivity
3.5.5 Cyclic adsorption
3.5.6 Competition adsorption
3.6 GCMC simulation
4 Conclusion
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