Isotherm, thermodynamic and kinetic studies of selective CO2 adsorption on chemically modified carbon surfaces
Open accessAbstract
Detailed assessments of adsorption properties (isotherm, thermodynamics and kinetics) were carried out on chemically modified activated carbon (AC). Some pretreatment methods prior amination have been used to improve the CO2 selective capture of AC in our previous works. Here, the inter-relationships among the adsorption properties were further investigated and reported. It was found that CO2 molecules bind onto the heterogeneous surfaces of AC in a monolayer pattern as experimental data fit Freundlich isotherm rather than Langmuir. However, Redlich-Peterson, a 3-parameter model provided the best fit. The highest degree of precision of Chi-square analysis professed it as the most efficient error function for the isotherm study. Values of standard entropy showed to be the most significant thermodynamic limiting parameter in the adsorption process, as physisorption was found predominant for CO2 collection at the interface. This observation was corroborated with temperature programmed desorption (TPD) analysis where ca. 86% of adsorbed CO2 were desorbed below 500°C. The kinetic study indicated that CO2-AC interaction follows pseudo-second order while the higher R2 of intraparticle diffusion over Elovich equation confirmed the deduction made from the thermodynamic study. Conclusively, the study of adsorption properties in this work provides useful information for designing proper adsorption reactor and subsequent regeneration of CO2-laden adsorbents at environmental levels.
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The maximum CO2 uptake reported for OTS was 6.15 mmol/g at 1 bar and 273 K.
“The maximum CO 2 uptake reported 6.15 mmol.g -1 at 1 bar and 273 K.”
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 [197]
The Assessment of CO₂ Adsorption Capacity section (page unavailable) says pure-CO₂ uptake was measured at 298 K, not 273 K. Table 4 (page unavailable) lists differently named adsorbents and does not report a maximum uptake of 6.15 mmol/g for OTS. (LLM, conf=0.83)
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Experimental — accuracy not yet measuredZhang et al. concluded the VSA cycles are able to effectively separate CO2 from the gas mixture using prepared adsorbents.
“Zhang et al. concluded the VSA cycles are able to effectively separate CO 2 from the gas mixture using prepared adsorbents [197].”
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 [197]
The Introduction (page unavailable) mentions VSA as an alternative adsorption process, and the CO2 Adsorption section reports selective capture using modified carbons. But this paper is by Adelodun et al., not Zhang et al., and it does not conclude that VSA cycles effectively separate CO2 using the prepared adsorbents. (LLM, conf=0.86)
Experimental — accuracy not yet measuredThe OTS samples had a BET surface area of 2676 m2/g.
“The OTS samples illustrated excellent structural characteristics such as 2676 m 2 .g -1 of BET surface.”
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 [197]
The Textural Characteristics of Adsorbents section (Table 2; page unavailable) reports BET surface areas for G1, G2, and their modified samples. Searches for OTS and 2676 found no passage assigning that surface area to OTS samples; values for different samples do not contradict the claim. (LLM, conf=0.74)
Experimental — accuracy not yet measuredThe selectivity results for OTS were 43.5, 7.4, and 5.9 for CO2/N2, CO2/CH4, and CH4/N2, respectively, at 1 bar and 298 K.
“the results showed 43.5, 7.4, and 5.9 for CO 2 /N 2 , CO 2 /CH 4 , and CH 4 /N 2 , respectively, at 1 bar and 298 K.”
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 [197]
The Assessment of CO2 Adsorption Capacity section describes tests at 298 K, including a CO2/N2 mixture, but gives none of the claimed selectivity values. Searches for the three values, OTS, and methane/CH4 found no passage in our copy reporting the claimed CO2/N2, CO2/CH4, or CH4/N2 results. Page numbers were not available in the indexed passages. (LLM, conf=0.76)
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Cited by 78
Research works printed but not linked: 7
- Adelodun, A.A., Kim, K.H., Ngila, J.C. and Szulejko, J. (2015). A review on the effect of amination pretreatment for the selective separation of CO 2 . Appl. Energy 158: 631-642.
- IPCC (2005). IPCC Special Report on Carbon dioxide Capture and Storage, Cambridge University Press, Cambridge, UK.
- Michael, G.A. and William, M.D. (2000). Indoor Carbon Dioxide Concentrations and SBS in Office Workers. Proceedings of Healthy Buildings, pp. 133-138.
- Olajire, A.A. (2010). CO 2 capture and separation technologies for end-of-pipe applications -A review. Energy 35: 2610-2628.
- Qui, H., Lu, L.V., Pan, B.C., Zhang, Q.J., Zhang, W.M. andZhang, Q.X. (2009). Critical review in adsorption kinetic models. J. Zhejiang Univ. Sci. A 10: 716-724.
- Shafeeyan, M.S., Wan Daud, W.M.A., Houshmand, A. and Shamiri, A. (2010). A review on surface modification of activated carbon adsorption. J. Anal. Appl. Pyrolysis 89: 143-151.
- Yu, C.H., Huang, C.H. and Tan, C.S. (2012). A review of CO 2 capture by absorption and adsorption. Aerosol Air Qual. Res. 12: 745-769.
- Authors
- Adelodun, A. A., Ngila, J. C., Kim, D.-G., & Jo, Y.-M.
- Affiliations
- University of Johannesburg (ZA)
- JEI University (KR)
- Kyung Hee University (KR)
- Venue
- Aerosol and Air Quality Research
- Published
- 2016
- Volume
- 16
- Issue
- 12
- Pages
- 3312-3329
- ISSN
- 1680-8584 (ISSN-L)
- 2071-1409
- OpenAlex
- W2494158860
- Cited by
- 78
- References
- 0
- Citations by year
- 2026: 15 · 2025: 15 · 2024: 6 · 2023: 6 · 2022: 7 · 2021: 9 · 2020: 8 · 2019: 7 · 2018: 3 · 2017: 2
- FWCI
- 3.56
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by-sa
- Locations
- Aerosol and Air Quality Research (publishedVersion, cc-by-sa)
- Funders
- National Research Foundation
- National Research Foundation of Korea (NRF-2015R1D1A1A01060182)
- Ministry of Education, Science and Technology (NRF-2015R1D1A1A01060182)
- 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, amination, CO2 capture, adsorption isotherms, Redlich-Peterson isotherm, adsorption thermodynamics, physisorption, adsorption kinetics, pseudo-second-order kinetics, intraparticle diffusion, temperature-programmed desorption, adsorbent regeneration
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