
Fabrication of coconut shell-derived porous carbons for CO2 adsorption application
Jiali Bai, Jiamei Huang, Qiyun Yu, Muslum Demir, Eda Akgul, Bilge Nazli Altay, Xin Hu, Linlin Wang
Front. Chem. Sci. Eng. ›› 2023, Vol. 17 ›› Issue (8) : 1122-1130.
Fabrication of coconut shell-derived porous carbons for CO2 adsorption application
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 as-prepared 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 °C) and KOH/biomass mass ratios (from 0.3 to 1), the 750 °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·g−1 at 0 and 25 °C (1 bar), respectively. More importantly, as-prepared carbon adsorbent exhibited moderate isosteric heat of adsorption and high CO2/N2 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.
porous carbons / CO2 adsorption / KOH activation / single step reaction / biomass
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