Chemical transformation of CO2 during its capture by waste biomass derived biochars
Abstract
Biochar is a porous carbonaceous material with high alkalinity and rich minerals, making it possible for CO2 capture. In this study, biochars derived from pig manure, sewage sludge, and wheat straw were evaluated for their CO2 sorption behavior. All three biochars showed high sorption abilities for CO2, with the maximum capacities reaching 18.2-34.4 mg g(-1) at 25 °C. Elevating sorption temperature and moisture content promoted the transition of CO2 uptake from physical to chemical process. Mineral components such as Mg, Ca, Fe, K, etc. in biochar induced the chemical sorption of CO2 via the mineralogical reactions which occupied 17.7%-50.9% of the total sorption. FeOOH in sewage sludge biochar was transformed by sorbed CO2 into Fe(OH)2CO3, while the sorbed CO2 in pig manure biochar was precipitated as K2Ca(CO3)2 and CaMg(CO3)2, which resulted in a dominant increase of insoluble inorganic carbon in both biochars. For wheat straw biochar, sorbed CO2 induced CaCO3 transformed into soluble Ca(HCO3)2, which led to a dominant increase of soluble inorganic carbons. The results obtained from this study demonstrated that biochar as a unique carbonaceous material could distinctly be a promising sorbent for CO2 capture in which chemical sorption induced by mineralogical reactions played an important role.
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Physisorption enhances the energy efficiency of regeneration.
“These solid sorbents primarily capture CO2 through physisorption, mainly via van der Waals interactions22,23, which enhances the energy efficiency of regeneration.”
From Metals incorporated agricultural waste corn Cob-based biochar used as an adsorbent for CO2 capturing (2025) · cites this paper as [23]
Solid sorbents primarily capture CO2 through physisorption, mainly via van der Waals interactions.
“These solid sorbents primarily capture CO2 through physisorption, mainly via van der Waals interactions22,23, which enhances the energy efficiency of regeneration.”
From Metals incorporated agricultural waste corn Cob-based biochar used as an adsorbent for CO2 capturing (2025) · cites this paper as [23]
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- Authors
- Xu, X., Kan, Y., Zhao, L., & Cao, X.
- Affiliations
- Shanghai Jiao Tong University (CN)
- Corresponding author
- Cao, Xinde
- Venue
- Environmental Pollution
- Publisher
- Elsevier BV
- Published
- 2016-06
- Volume
- 213
- Pages
- 533-540
- ISSN
- 0269-7491 (ISSN-L)
- OpenAlex
- W2299492599
- Cited by
- 220
- References
- 39
- Citations by year
- 2026: 23 · 2025: 33 · 2024: 26 · 2023: 42 · 2022: 30 · 2021: 20 · 2020: 15 · 2019: 14 · 2018: 10 · 2017: 4 · 2016: 3
- FWCI
- 9.19
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Pollution (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (21537002, 21377081, 21428702)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Keywords
- CO2 capture, biochar, chemical sorption, sewage sludge biochar, wheat straw biochar, inorganic carbon, calcium carbonate, bicarbonate, iron oxyhydroxide, biomass waste, CO2 sorption capacity
- MeSH terms
- Adsorption, Animals, Carbon Dioxide, Charcoal, Humidity, Hydrogen-Ion Concentration, Manure, Minerals, Sewage, Silage, Temperature, Triticum, Sus scrofa
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