Breakthrough CO 2 adsorption in bio-based activated carbons
Abstract
In this work, the effects of different methods of activation on CO2 adsorption performance of activated carbon were studied. Activated carbons were prepared from biochar, obtained from fast pyrolysis of white wood, using three different activation methods of steam activation, CO2 activation and Potassium hydroxide (KOH) activation. CO2 adsorption behavior of the produced activated carbons was studied in a fixed-bed reactor set-up at atmospheric pressure, temperature range of 25-65°C and inlet CO2 concentration range of 10-30 mol% in He to determine the effects of the surface area, porosity and surface chemistry on adsorption capacity of the samples. Characterization of the micropore and mesopore texture was carried out using N2 and CO2 adsorption at 77 and 273 K, respectively. Central composite design was used to evaluate the combined effects of temperature and concentration of CO2 on the adsorption behavior of the adsorbents. The KOH activated carbon with a total micropore volume of 0.62 cm(3)/g and surface area of 1400 m(2)/g had the highest CO2 adsorption capacity of 1.8 mol/kg due to its microporous structure and high surface area under the optimized experimental conditions of 30 mol% CO2 and 25°C. The performance of the adsorbents in multi-cyclic adsorption process was also assessed and the adsorption capacity of KOH and CO2 activated carbons remained remarkably stable after 50 cycles with low temperature (160°C) regeneration.
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Activated carbons prepared by KOH from coffee grounds have higher adsorption capacity for carbon capture than physically activated samples, with maximum CO2 loading capacity 4.9 mmol/g at 298 K and 1 bar.
“They illustrated activated carbons prepared by KOH have a higher adsorption capacity for carbon capture (which the maximum CO 2 loading capacity was 4.9 mmol.g -1 at 298 K and 1 bar), while physically activated samples showed a higher selectivity.”
From Biomass/Biochar carbon materials for CO2 capture and sequestration by cyclic adsorption processes: A review and prospects for future directions (2022) · cites this paper as [118]
Physically activated coffee ground samples showed higher selectivity than KOH-activated samples.
“They illustrated activated carbons prepared by KOH have a higher adsorption capacity for carbon capture (which the maximum CO 2 loading capacity was 4.9 mmol.g -1 at 298 K and 1 bar), while physically activated samples showed a higher selectivity.”
From Biomass/Biochar carbon materials for CO2 capture and sequestration by cyclic adsorption processes: A review and prospects for future directions (2022) · cites this paper as [118]
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- Authors
- Shahkarami, S., Azargohar, R., Dalai, A. K., & Soltan, J.
- Affiliations
- University of Saskatchewan (CA)
- Corresponding author
- Dalai, Ajay K.
- Venue
- Journal of Environmental Sciences
- Publisher
- Elsevier BV
- Published
- 2015-08
- Volume
- 34
- Pages
- 68-76
- ISSN
- 1001-0742 (ISSN-L)
- OpenAlex
- W2137305477
- Cited by
- 155
- References
- 22
- Citations by year
- 2026: 15 · 2025: 15 · 2024: 24 · 2023: 18 · 2022: 25 · 2021: 18 · 2020: 16 · 2019: 10 · 2018: 3 · 2017: 5 · 2016: 6
- FWCI
- 4.58
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Environmental Sciences (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Engineering › Mechanical Engineering › Industrial Gas Emission Control
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Keywords
- CO2 adsorption, activated carbon, biochar, fast pyrolysis, steam activation, CO2 activation, KOH activation, microporosity, surface area, surface chemistry, fixed-bed adsorption, adsorption capacity, adsorbent regeneration, CO2 capture
- MeSH terms
- Adsorption, Air Pollutants, Air Pollution, Carbon, Carbon Dioxide, Charcoal, Temperature, Environmental Restoration and Remediation
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