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Adsorption is currently the most promising capture technology to shorten atmospheric emissions of carbon dioxide (CO 2 ). In this article, we report on the adsorption of CO 2  onto pristine, oxidized, and aminated activated carbon (AC) sorbents. From our findings, some functionalized AC sorbents have shown very promising results in the CO 2  capture process. Their maximum adsorption capacity measured by the thermogravimetric method at 20 °C varies between 2.2 and 3.9 mmol CO 2 /g depending on the content of diethylamino and oxygen-containing groups. The functionalization of the carbon surface with diethylamino groups improves the adsorption capacity by 30–40%. The CO 2  adsorption little depends on the texture parameters of the pristine AC sorbents. In the range from 20 to 100 °C, the CO 2  thermodesorption showed the effective regeneration of the sorbents. The aminated carbon surface demonstrates the best CO 2  adsorption but binds the adsorbed molecules stronger than the oxidized surface, which limits the sorbent regeneration.

CO2 adsorption on pristine, oxidized, and diethylamine-functionalized activated carbon sorbents

CO₂ adsorption on pristine, oxidized, and diethylamine-functionalized activated carbon sorbents