Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination

Jueun Choi; Hyeonseok Yi; Toru Kato; Koji Saito; Hiroko Watanabe; Keiko Ideta; Takaaki Shimohara; Jin Miyawaki; Seong‑Ho Yoon (윤성호); Yoong Ahm Kim (김융암); Koji Nakabayashi

doi:10.1007/s42823-024-00833-y

@article{ART003208681},
author={Jueun Choi and Hyeonseok Yi and Toru Kato and Koji Saito and Hiroko Watanabe and Keiko Ideta and Takaaki Shimohara and Jin Miyawaki and Seong‑Ho Yoon and Yoong Ahm Kim and Koji Nakabayashi},
title={Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination},
journal={Carbon Letters},
issn={1976-4251},
year={2025},
volume={35},
number={2},
pages={825-837},
doi={10.1007/s42823-024-00833-y}

TY - JOUR
AU - Jueun Choi
AU - Hyeonseok Yi
AU - Toru Kato
AU - Koji Saito
AU - Hiroko Watanabe
AU - Keiko Ideta
AU - Takaaki Shimohara
AU - Jin Miyawaki
AU - Seong‑Ho Yoon
AU - Yoong Ahm Kim
AU - Koji Nakabayashi
TI - Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination
JO - Carbon Letters
PY - 2025
VL - 35
IS - 2
PB - Korean Carbon Society
SP - 825
EP - 837
SN - 1976-4251
AB - 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.
KW - Marine biomass;Activated carbon;Alkali and alkaline earth metals;Atmospheric and pressurized CO2 activations;Mesopore
DO - 10.1007/s42823-024-00833-y
ER -

Jueun Choi, Hyeonseok Yi, Toru Kato, Koji Saito, Hiroko Watanabe, Keiko Ideta, Takaaki Shimohara, Jin Miyawaki, Seong‑Ho Yoon, Yoong Ahm Kim and Koji Nakabayashi. (2025). Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination. Carbon Letters, 35(2), 825-837.

Jueun Choi, Hyeonseok Yi, Toru Kato, Koji Saito, Hiroko Watanabe, Keiko Ideta, Takaaki Shimohara, Jin Miyawaki, Seong‑Ho Yoon, Yoong Ahm Kim and Koji Nakabayashi. 2025, "Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination", Carbon Letters, vol.35, no.2 pp.825-837. Available from: doi:10.1007/s42823-024-00833-y

Jueun Choi, Hyeonseok Yi, Toru Kato, Koji Saito, Hiroko Watanabe, Keiko Ideta, Takaaki Shimohara, Jin Miyawaki, Seong‑Ho Yoon, Yoong Ahm Kim, Koji Nakabayashi "Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination" Carbon Letters 35.2 pp.825-837 (2025) : 825.

Jueun Choi, Hyeonseok Yi, Toru Kato, Koji Saito, Hiroko Watanabe, Keiko Ideta, Takaaki Shimohara, Jin Miyawaki, Seong‑Ho Yoon, Yoong Ahm Kim, Koji Nakabayashi. Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination. 2025; 35(2), 825-837. Available from: doi:10.1007/s42823-024-00833-y

Jueun Choi, Hyeonseok Yi, Toru Kato, Koji Saito, Hiroko Watanabe, Keiko Ideta, Takaaki Shimohara, Jin Miyawaki, Seong‑Ho Yoon, Yoong Ahm Kim and Koji Nakabayashi. "Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination" Carbon Letters 35, no.2 (2025) : 825-837.doi: 10.1007/s42823-024-00833-y

Jueun Choi; Hyeonseok Yi; Toru Kato; Koji Saito; Hiroko Watanabe; Keiko Ideta; Takaaki Shimohara; Jin Miyawaki; Seong‑Ho Yoon; Yoong Ahm Kim; Koji Nakabayashi. Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination. Carbon Letters, 35(2), 825-837. doi: 10.1007/s42823-024-00833-y

Jueun Choi; Hyeonseok Yi; Toru Kato; Koji Saito; Hiroko Watanabe; Keiko Ideta; Takaaki Shimohara; Jin Miyawaki; Seong‑Ho Yoon; Yoong Ahm Kim; Koji Nakabayashi. Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination. Carbon Letters. 2025; 35(2) 825-837. doi: 10.1007/s42823-024-00833-y

Jueun Choi, Hyeonseok Yi, Toru Kato, Koji Saito, Hiroko Watanabe, Keiko Ideta, Takaaki Shimohara, Jin Miyawaki, Seong‑Ho Yoon, Yoong Ahm Kim, Koji Nakabayashi. Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination. 2025; 35(2), 825-837. Available from: doi:10.1007/s42823-024-00833-y

Jueun Choi, Hyeonseok Yi, Toru Kato, Koji Saito, Hiroko Watanabe, Keiko Ideta, Takaaki Shimohara, Jin Miyawaki, Seong‑Ho Yoon, Yoong Ahm Kim and Koji Nakabayashi. "Enhanced porosity in marine biomass-derived activated carbon via two-step CO2 activation and acidic decontamination" Carbon Letters 35, no.2 (2025) : 825-837.doi: 10.1007/s42823-024-00833-y

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