Publication: Surface Modification of Activated Carbon by Nitrogen Doping and KOH Activation for Enhanced Carbon Dioxide Adsorption Performance
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0
Issued Date
2025-01-01
Resource Type
ISSN
21646325
eISSN
21646341
Scopus ID
2-s2.0-105023828107
Journal Title
Journal of Renewable Materials
Volume
13
Issue
11
Start Page
2155
End Page
2168
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Renewable Materials Vol.13 No.11 (2025) , 2155-2168
Suggested Citation
Chobsilp T., Treetong A., Yordsri V., Santasnachok M., Charoeythornkhajhornchai P., Sukkasem J., Wongwiriyapan W., Muangrat W. Surface Modification of Activated Carbon by Nitrogen Doping and KOH Activation for Enhanced Carbon Dioxide Adsorption Performance. Journal of Renewable Materials Vol.13 No.11 (2025) , 2155-2168. 2168. doi:10.32604/jrm.2025.02025-0111 Retrieved from: https://hdl.handle.net/20.500.14740/54966
Corresponding Author(s)
Other Contributor(s)
Abstract
Nitrogen-doped activated carbon (N-AC) was successfully prepared by KOH-activation and nitrogen doping using ammonia (NH<inf>3</inf>) heat treatment. Coconut shell-derived activated carbon (AC) was heat-treated under NH<inf>3</inf> gas in the temperature range of 700℃–900℃. Likewise, the mixture of potassium hydroxide (KOH) and AC was heated at 800℃, followed by heat treatment under NH<inf>3</inf> gas at 800℃ (hereafter referred to as KOH-N-AC800). Scanning electron microscopy (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) method were utilized to analyze morphology, crystallinity, chemical bonding, chemical composition and surface area. The surface area and porosity of N-AC increased with increasing NH<inf>3</inf> heat treatment. Similarly, the nitrogen content in the N-AC increased from 3.23% to 4.84 at% when the NH<inf>3</inf> heat treatment was raised from 700℃ to 800℃. However, the nitrogen content of N-AC decreased to 3.40 at% after using NH<inf>3</inf> heat treatment at 900℃. The nitrogen content of KOH-N-AC800 is 5.43 at%. KOH-N-AC800 and N-AC800 exhibited improvements of 33.66% and 26.24%, respectively, in CO<inf>2</inf> adsorption compared with AC. The enhancement of CO<inf>2</inf> adsorption of KOH-N-AC800 is attributed to the synergic effect of the nitrogen doping, high surface area, and porosity. The results exhibited that nitrogen sites on the surface play a more significant role in CO<inf>2</inf> adsorption than surface area and porosity. This work proposes the potential synergistic effect of KOH-activation and nitrogen doping for enhancing the CO<inf>2</inf> adsorption capacity of activated carbon.