High-surface-area porous carbons produced by the mild KOH activation of a chitosan hydrochar and their CO<sub>2</sub> capture

WANG Jing; CHEN Shuang; XU Jia-yu; LIU Li-cheng; ZHOU Ji-cheng; CAI Jin-jun

doi:10.1016/S1872-5805(21)60074-4

Volume 36 Issue 6

Dec. 2021

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Article Navigation > New Carbon Mater. > 2021 > 36(6): 1081-1093

WANG Jing, CHEN Shuang, XU Jia-yu, LIU Li-cheng, ZHOU Ji-cheng, CAI Jin-jun. High-surface-area porous carbons produced by the mild KOH activation of a chitosan hydrochar and their CO2 capture. New Carbon Mater., 2021, 36(6): 1081-1093. doi: 10.1016/S1872-5805(21)60074-4

Citation:

WANG Jing, CHEN Shuang, XU Jia-yu, LIU Li-cheng, ZHOU Ji-cheng, CAI Jin-jun. High-surface-area porous carbons produced by the mild KOH activation of a chitosan hydrochar and their CO₂ capture. New Carbon Mater., 2021, 36(6): 1081-1093. doi: 10.1016/S1872-5805(21)60074-4

Citation:

WANG Jing, CHEN Shuang, XU Jia-yu, LIU Li-cheng, ZHOU Ji-cheng, CAI Jin-jun. High-surface-area porous carbons produced by the mild KOH activation of a chitosan hydrochar and their CO₂ capture. New Carbon Mater., 2021, 36(6): 1081-1093. doi: 10.1016/S1872-5805(21)60074-4

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High-surface-area porous carbons produced by the mild KOH activation of a chitosan hydrochar and their CO₂ capture

doi: 10.1016/S1872-5805(21)60074-4

WANG Jing^{1, 2
,},
CHEN Shuang¹,
XU Jia-yu¹,
LIU Li-cheng²,
ZHOU Ji-cheng^{1
,
,},
CAI Jin-jun^{1, 2
,
,}

1.
Hunan Key Laboratory of Environment Friendly Chemical Process, School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
2.
CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China

More Information

Author Bio:
王　静，硕士研究生. E-mail：1322232881@qq.com
Corresponding author: ZHOU Ji-cheng, Professor. E-mail: zhoujicheng@sohu.com; CAI Jin-Jun, Associated Professor. E-mail: caijj@xtu.edu.cn
Received Date: 2020-07-22
Rev Recd Date: 2020-09-01

Available Online: 2021-11-17

Publish Date: 2021-12-01

Abstract

Abstract

Hydrothermal treatment of biomass is effective in producing hydrochar, but the product usually has a low surface area and is not suitable for direct use as an adsorbent for CO₂ capture. We report the use of chitosan as a precursor for carbon prepared by a combination of hydrothermal treatment and mild KOH activation. The effect of an additive salt (eutectic salt of KCl/LiCl with a mass ratio of 5.5/4.5) in the hydrothermal treatment and activation temperature on the porosities and surface chemical states of the obtained carbons and their CO₂ capture were studied by N₂ adsorption, XPS, SEM and XRD. Results indicated that the porosities of the carbons were increased by increasing the activation temperature. The salt additive introduced mesopores in the hydrochar and slightly reduced the surface area of the porous carbon after activation, but was useful in increasing the number of N-species during hydrothermal treatment and activation. The carbons produced using the salt additive had much larger CO₂ uptakes under ambient conditions than those prepared without the salt, suggesting that porosity is not the only factor that determines the CO₂ uptake. The CO₂ uptake on the carbon activated by KOH at 600 °C produced from the salt-assisted hydrochar was the highest (as high as 4.41 mmol/g) although its surface area was only 1 249 m²/g, indicating that CO₂ uptake was determined by both the microporosity and the active N-species in the carbon.
- Chitosan,
- Porous carbon,
- Hydrothermal carbonization,
- KOH activation,
- CO₂ capture

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References(39)

References

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