Gasification biochar from biowaste (food waste and wood waste) for effective CO2 adsorption
Abstract
Biochar is newly proposed as an innovative and cost-effective material to capture CO 2. In this study, biochar was produced from feedstock mixtures of food waste and wood waste (i.e., 20%:80% WFW20, 30%:70% WFW30 and 40%:60% WFW40) by gasification. The two biochar adsorbents containing the highest percentage of food waste, i.e., WFW40-K and WFW40-KC, were activated by KOH and KOH + CO 2, respectively. The biochar adsorbents were then tested for CO 2 adsorption at room temperature of 25 °C by using a volumetric sorption analyzer. The WFW20 showed the highest CO 2 adsorption capacity, while higher percentage of food waste in the feedstock was unfavorable for the CO 2 adsorption. The presence of N and S on the biochar surface was the primary contributor to the high CO 2 uptake on WFW20. The development of micropores by KOH activation significantly increased the CO 2 adsorption on WFW40-K, but KOH + CO 2 activation could not further increase the development of micropores and subsequent CO 2 adsorption. Moreover, WFW40-K showed >99% recyclability during 10 consecutive adsorption-desorption cycles. The biochars derived from biowaste (food waste and wood waste) could be effective adsorbents for CO 2 capture by providing green solution for food waste recycling.
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Biochar activated by metal hydroxides generates microporosity favorable for CO2 adsorption.
“Biochar activated by metal hydroxides has been recognized as generating microporosity favorable for CO2 [25] and aqueous contaminants adsorption [26,27]”
From Direct air capture of CO2 by KOH-activated bamboo biochar (2022) · cites this paper as [25]
KOH-activated biochar showed excellent CO2 adsorption capacity due to its abundant micropores developed after activation.
“Igalavithana et al. (2020a) found that KOH-activated biochar showed excellent CO2 adsorption capacity due to its abundant micropores developed after activation.”
From Lignin-impregnated biochar assisted with microwave irradiation for CO2 capture: adsorption performance and mechanism (2024) · cites this paper as Igalavithana et al. (2020a)
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- Authors
- Igalavithana, A. D., Choi, S. W., Dissanayake, P. D., Shang, J., Wang, C.-H., Yang, X., Kim, S., Tsang, D. C. W., Lee, K. B., & Ok, Y. S.
- Affiliations
- Korea University (KR)
- City University of Hong Kong (HK)
- National University of Singapore (SG)
- Hong Kong Polytechnic University (HK)
- Yonsei University (KR)
- Corresponding author
- Lee, Ki Bong
- Ok, Yong Sik
- ORCID
- Venue
- Journal of Hazardous Materials
- Publisher
- Elsevier BV
- Published
- 2020-06
- Volume
- 391
- Pages
- 121147
- ISSN
- 0304-3894 (ISSN-L)
- OpenAlex
- W2972021728
- Cited by
- 225
- References
- 74
- Citations by year
- 2026: 19 · 2025: 33 · 2024: 31 · 2023: 35 · 2022: 58 · 2021: 29 · 2020: 18 · 2019: 2
- FWCI
- 15.05
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Hazardous Materials (publishedVersion)
- PubMed (publishedVersion)
- Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
- Funders
- Korea Ministry of Environment (2018002490001)
- Hydrogen Energy Innovation Technology Development Program of the National Research Foundation of Korea
- Korean government (Ministry of Science and IC (NRF-2019M3E6A1064197)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Keywords
- biochar, CO2 adsorption, CO2 capture, gasification, food waste, wood waste, biomass waste valorization, KOH activation, micropore development, adsorbent reusability, food waste recycling
- MeSH terms
- Pyrolysis, Adsorption, Carbon Dioxide, Charcoal, Food, Hydroxides, Waste Products, Wood, Potassium Compounds, Carbon Sequestration
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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