Nitrogen Functionalized Biochar as a Renewable Adsorbent for Efficient CO2 Removal
Abstract
In this study, biochar was thermally and chemically (thermo-chemically) modified and compared to the unmodified parent char in carbon dioxide adsorption. The biochars were sourced from sawmill residues and produced via fast pyrolysis in an auger reactor. The biochar was chemically functionalized using two novel methods of amine functionalization: (i) nitration, followed by reduction, and (ii) condensation of aminopropyl triethoxysilane on the surface. The obtained outcomes indicated functionalization resulted in a reduction in the pore volume and surface area of the biochar. The biochars (unmodified and chemically modified) were thermally activated via air diluted with nitrogen at moderate 560 °C to determine if the adsorption properties could be enhanced. The thermally treated functionalized chars had a lower H:C ratio, higher surface area, micropore volume, and sufficient amount of nitrogen compared to the unmodified char. The thermally treated aminopropyl triethoxysilane char had the highest adsorption capacity of 3.7 mmol/g with 0.24 wt % nitrogen. Biochars sourced from residues demonstrated high efficiency of carbon dioxide removal, comparable to some synthesized adsorbents reported in the literature.
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Use of pure CO2 environment for adsorption experiment with N2 activated sawdust biochar resulted in increased adsorption capacity than any other reported data.
“The use of pure CO2 environment for adsorption experiment with N2 activated- sawdust biochar resulted to show increased adsorption capacity than any other reported data.”
From Effect of Pyrolysis Temperature on PhysicoChemical Properties and Acoustic-Based Amination of Biochar for Efficient CO2 Adsorption (2020) · cites this paper as Bamdad et al., 2018
Adsorption capacity for sawdust biochar pyrolyzed at 500 °C and activated under N2 environment exhibited higher value than adsorption capacity data obtained in the present study.
“However, the adsorption capacity for sawdust biochar pyrolyzed at 500 ◦ C and activated under N2 environment exhibited higher value than the adsorption capacity data obtained in the present study (Bamdad et al., 2018).”
From Effect of Pyrolysis Temperature on PhysicoChemical Properties and Acoustic-Based Amination of Biochar for Efficient CO2 Adsorption (2020) · cites this paper as Bamdad et al., 2018
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Self-citation
- Authors
- Bamdad, H., Hawboldt, K., & MacQuarrie, S.
- Affiliations
- Memorial University of Newfoundland (CA)
- Cape Breton University (CA)
- Corresponding author
- Bamdad, Hanieh
- Venue
- Energy & Fuels
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-10-30
- Volume
- 32
- Issue
- 11
- Pages
- 11742-11748
- ISSN
- 0887-0624 (ISSN-L)
- 1520-5029
- OpenAlex
- W2899320941
- Cited by
- 64
- References
- 32
- Citations by year
- 2026: 5 · 2025: 9 · 2024: 6 · 2023: 11 · 2022: 10 · 2021: 8 · 2020: 11 · 2019: 4
- FWCI
- 3.67
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Energy & Fuels (publishedVersion)
- Funders
- BioFuelNet Canada
- Natural Sciences and Engineering Research Council of Canada
- School of Graduate Studies, Memorial University of Newfoundland
- 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, nitrogen functionalization, CO2 adsorption, CO2 capture, sawmill waste, fast pyrolysis, 3-aminopropyltriethoxysilane, thermal activation, amine functionalization, surface area, micropore volume, renewable adsorbents
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