Fabrication of coconut shell-derived porous carbons for CO<sub>2</sub> adsorption application

doi:10.1007/s11705-022-2292-6

Front. Chem. Sci. Eng.

2023, Vol. 17

Issue (8) : 1122-1130 https://doi.org/10.1007/s11705-022-2292-6

RESEARCH ARTICLE

Fabrication of coconut shell-derived porous carbons for CO₂ adsorption application

Jiali Bai¹, Jiamei Huang¹, Qiyun Yu¹, Muslum Demir², Eda Akgul², Bilge Nazli Altay^3,⁴, Xin Hu¹(

), Linlin Wang⁵(

)

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

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Abstract

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.

Keywords porous carbons CO₂ adsorption KOH activation single step reaction biomass

Corresponding Author(s): Xin Hu,Linlin Wang

Online First Date: 24 April 2023 Issue Date: 20 July 2023

Cite this article:

Jiali Bai,Jiamei Huang,Qiyun Yu, et al. Fabrication of coconut shell-derived porous carbons for CO₂ adsorption application[J]. Front. Chem. Sci. Eng., 2023, 17(8): 1122-1130.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2292-6
https://academic.hep.com.cn/fcse/EN/Y2023/V17/I8/1122

Fig.1 SEM images of (a) and (b) CSC-750-0.5, TEM image of (c) CSC-750-0.5 and XRD pattern of (d) CSC-750-0.5.

Tab.1 Porous textural, elemental composition and CO₂ uptakes of porous carbons derived from coconut shell under different conditions

Fig.2 (a) XPS survey spectra for the selected samples, XPS O1s of (b) CSC-700-0.5, (c) CSC-750-0.5 and (d) CSC-700-1.

Fig.3 N₂ sorption isotherms of the samples prepared at (a) KOH/CS mass ratios of 0.3:1, (b) KOH/CS mass ratios of 0.5:1 and (c) KOH/CS mass ratios of 1:1. Filled and empty symbols represent adsorption and desorption branches, respectively.

Fig.4 Pore size distribution of the samples prepared at (a) KOH/CS mass ratios of 0.3:1, (b) KOH/CS mass ratios of 0.5:1 and (c) KOH/CS mass ratios of 1:1.

Fig.5 CO₂ adsorption isotherms at 25 °C (filled symbols) and 0 °C (empty symbols) for carbons prepared under (a) KOH/CS mass ratios of 0.3:1, (b) KOH/CS mass ratios of 0.5:1 and (c) KOH/CS mass ratios of 1:1.

Fig.6 (a) CO₂ and N₂ adsorption isotherms of CSC-750-0.5 at 25 °C and 1 bar, (b) adsorption kinetic of CO₂ at 25 °C for CSC-750-0.5, (c) isosteric heat of CO₂ adsorption on selected adsorbents calculated from the experimental adsorption isotherms at 0 and 25 °C and (d) breakthrough curves of CSC-750-0.5 (adsorption temperature: 25 °C, gas flow rate: 10 mL·min^?1, inlet CO₂ concentration: 10 vol %, gas pressure: 1 bar).

Fig.7 Cyclic study of CO₂ adsorption for CSC-750-0.5.

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