期刊
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
卷 17, 期 8, 页码 1122-1130出版社
SPRINGER
DOI: 10.1007/s11705-022-2292-6
关键词
porous carbons; OO2 ddsorption; KOH activation; single step reaction; biomass
Biomass-derived porous carbons are promising CO2 adsorbents due to their wide availability, highly porous structure, and stable chemical/physical features. This study successfully synthesized coconut shell-derived porous carbon through a simple one-step process. The optimal adsorbent exhibited a high CO2 uptake capacity and moderate isosteric heat of adsorption, indicating its considerable potential for CO2 capture.
Biomass-derived porous carbons have been considered as the most potential candidate for effective CO2 adsorbent thanks to being widely-available precursor and having highly porous structure and stable chemical/physical features. However, the biomass-derived porous carbons still suffer from the poor optimization process in terms of the synthesis conditions. Herein, we have successfully fabricated coconut shell-derived porous carbon by a simple one-step synthesis process. The asprepared carbon exhibits advanced textual activity together with well-designed micropore morphology and possesses oxygen-containing functional groups (reached 18.81 wt %) within the carbon matrix. Depending on the different activating temperatures (from 700 to 800 degrees C) and KOH/biomass mass ratios (from 0.3 to 1), the 750 degrees C and 0.5 mass ratio were found to be enabling the highest CO2 capture performance. The optimal adsorbent was achieved a high CO2 uptake capacity of 5.92 and 4.15 mmol center dot g(-1) at 0 and 25 degrees C (1 bar), respectively. More importantly, asprepared carbon adsorbent exhibited moderate isosteric heat of adsorption and high CO2/N-2 selectivity. The results were revealed not only the textural feature but also the surface functional groups critically determine the CO2 capture performance, indicating coconut shell-derived porous carbon has a considerable potential as a solid-state adsorbent for the CO2 capture.
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