Amine-Modified Biochar for the Efficient Adsorption of Carbon Dioxide in Flue Gas
Open accessAbstract
Biochar-based carbonaceous adsorbents are gaining interest due to their high availability, ease of modification, and low cost; however, they show limited adsorption of CO2 in flue gas due to common textural properties. In this study, TEPA-modified biochar was used to prepare a solid amine adsorbent for the efficient capture of CO2 in flue gas. First, the porous biochar was prepared with FeCl3, Mg(NO3)2, and H2O (g) as activators and walnut shells as carbon sources. Next, the biochar was modified with TEPA to obtain a solid amine adsorbent. Porous texture properties and sample surface functional groups were characterized, and we measured the adsorption CO2 of the amine-modified biochar in a breakthrough adsorption device. Results showed that biochar has a large specific surface area (744.38 m2 g−1), a total pore volume of 1.41 cm3 g−1, and a high mesoporous volume ratio (82.7%). The high pore volume provided a more efficient support space for loading tetraethylenepentamine (TEPA). The adsorbent had an excellent CO2 adsorption capacity, corresponding to 2.82 mmol g−1, which increased to 3.31 mmol g−1 and kept water resistance at 10% H2O (g) simulated flue gas (SFG). The FTIR analysis showed that H2O (g) inhibited urea production after cyclic adsorption. Therefore, solid amine adsorbent created by amine-modified biochar has potential advantages in its application for capturing CO2 in SFG.
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Using steam alone for activation makes it challenging to regulate the pore structure of biochar and its overall activation efficiency.
“However, using steam alone for activation makes it challenging to regulate the pore structure of biochar and its overall activation efficiency29.”
From Metals incorporated agricultural waste corn Cob-based biochar used as an adsorbent for CO2 capturing (2025) · cites this paper as [29]
The Introduction says that using only steam makes it difficult to control biochar’s pore structure and activation rate. It does not make the same claim about overall activation efficiency; rate and efficiency are different properties. No page number is available in our copy. (LLM, conf=0.86)
Experimental — accuracy not yet measuredMetal salt activators such as ZnCl2, FeCl3, and MgCl2 provide advantages including reduced corrosiveness, environmental friendliness, and reusability.
“In contrast to disposable activators like KOH30, HNO331, and H3PO432, metal salt activators such as ZnCl233, FeCl334, and MgCl229 provide advantages including reduced corrosiveness, environmental friendliness, and reusability.”
From Metals incorporated agricultural waste corn Cob-based biochar used as an adsorbent for CO2 capturing (2025) · cites this paper as [29]
The Introduction identifies ZnCl2, FeCl3, and MgCl2 as biochar activators and says several disposable activators are highly corrosive, difficult to recycle, and environmentally damaging. It does not establish that the metal salts themselves are less corrosive, environmentally friendly, or reusable; it calls steam, not metal salts, eco-friendly. (LLM, conf=0.85)
Experimental — accuracy not yet measuredSteam H2O(g) is an environmentally friendly option that can increase pore size and create new pore structures within biochar.
“Among the various activators, steam H₂O(g) is considered an environmentally friendly option that can increase pore size and create new pore structures within the biochar.”
From Metals incorporated agricultural waste corn Cob-based biochar used as an adsorbent for CO2 capturing (2025) · cites this paper as [29]
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Self-citation
- Authors
- Tian, W., Wang, Y., Hao, J., Guo, T., Wang, X., Xiang, X., & Guo, Q.
- Affiliations
- Ningxia University (CN)
- North Minzu University (CN)
- University College London (GB)
- Weifang University (CN)
- Corresponding author
- Guo, Qingjie
- Venue
- Atmosphere
- Publisher
- MDPI AG
- Published
- 2022-04-04
- Volume
- 13
- Issue
- 4
- Pages
- 579
- ISSN
- 2073-4433 (ISSN-L)
- OpenAlex
- W4226051798
- Cited by
- 37
- References
- 51
- Citations by year
- 2026: 9 · 2025: 11 · 2024: 13 · 2022: 4
- FWCI
- 2.64
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Atmosphere (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- The Joint Funds of the National Natural Science Foundation of China (U20A20124)
- Major Project of Key Research and Development Program of Ningxia Province, China (2018BCE01002)
- The National First−rate Discipline Construction Project of Ningxia (NXYLXK2017A04)
- The National Natural Science Foundation of China (22108208)
- Foundation of State Key Laboratory of High–efficiency Utilization of Coal and Green Chemical Engineering (2022–K27)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Engineering › Mechanical Engineering › Industrial Gas Emission Control
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Keywords
- CO2 adsorption, flue gas, tetraethylenepentamine, solid amine adsorbents, biochar activation, walnut shell, porous carbon, water resistance, urea formation, CO2 capture
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