1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua 321004, China 2. Department of Chemical Engineering, Osmaniye Korkut Ata University, Osmaniye 80000, Turkey 3. College of Engineering Technology, Print and Graphic Media Science, Rochester Institute of Technology, New York 14623, USA 4. Institute of Pure and Applied Sciences, Marmara University, Istanbul 34722, Turkey 5. Key Laboratory of Urban Rail Transit Intelligent Operation and Maintenance Technology and Equipment of Zhejiang Province, College of Engineering, Zhejiang Normal University, Jinhua 321004, China
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.
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