Carbon Letters 2025 KCI Impact Factor : 0.73 KCI-WoS Impact Factor : 6.26
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pISSN : 1976-4251 / eISSN : 2233-4998
- https://journal.kci.go.kr/carbon
KJCKorea
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Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination
- Carbon Letters
- Abbr : Carbon Lett.
- 2025, 35(2), pp.825~837
- DOI : 10.1007/s42823-024-00833-y
- Publisher : Korean Carbon Society
- Research Area : Natural Science > Natural Science General > Other Natural Sciences General
- Received : September 29, 2024
- Accepted : November 24, 2024
- Published : June 5, 2025
Jueun Choi
1,
Hyeonseok Yi
1,
Toru Kato
2,
Koji Saito
3,
Hiroko Watanabe
3,
Keiko Ideta
1,
Takaaki Shimohara
1,
Jin Miyawaki
1,
Seong‑Ho Yoon
1,
Yoong Ahm Kim
4,
Koji Nakabayashi
1
1Kyushu University
2The Japan Research and Development Center for Metals
3Nippon Steel Technology Co., Ltd.
4전남대학교
Accredited
ABSTRACT
Marine biomass (MB) is gaining attention as a sustainable and eco-friendly carbon source within the carbon cycle, particularly in regions with extensive coastlines. However, the high content of alkali and alkaline earth metals (AAEMs) in MB poses challenges in producing functional carbon materials, like activated carbon (AC), with a high specific surface area (SSA). In this study, we employed a two-step CO2 activation process, coupled with acid treatment, to successfully convert MB into highly porous AC. Preheating followed by nitric acid washing reduced AAEM content from 22.4 to 2.5 wt%, and subsequent atmospheric CO2 activation produced AC with an SSA of 1700 m2/g and mesopores of 3–5 nm. A further treatment with a mixed acid solution of nitric and acetic acids reduced impurities to below 1.0 wt%. A second pressurized CO2 activation at 1 MPa yielded AC with an SSA exceeding 2100 m2/g, with mesopores accounting for more than 50% of the total pore volume. This method demonstrates an effective approach to producing high-performance AC from MB for advanced applications.
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