Abstract
Activated carbons with a high mesoporous structure were prepared by a one‐stage KOH activation process without the assistance of templates and further used as adsorbents for CO2 capture. The physical and chemical properties as well as the pore structures of the resulting mesoporous carbons were characterized by N2 adsorption isotherms, scanning electron microscopy (SEM), X‐ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared (FTIR) spectroscopy. The activated carbon showed greater specific surface area and mesopore volume as the activation temperature was increased up to 600°C, showing a uniform pore structure, great surface area (up to ~815 m2/g), and high mesopore ratio (~55%). The activated sample exhibited competitive CO2 adsorption capacities at 1 atm pressure, reaching 2.29 and 3.4 mmol/g at 25 and 0°C, respectively. This study highlights the potential of well‐designed mesoporous carbon as an adsorbent for CO2 removal and widespread gas adsorption applications.
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