Effect of Pore Structure on CO2 Adsorption Performance for ZnCl2/FeCl3/H2O(g) Co-Activated Walnut Shell-Based Biochar
Open accessAbstract
Walnut shell is a very potential biochar precursor because of its wide source, low cost, and easy structure modification. In this paper, the co-activation method of FeCl3, ZnCl2 and H2O(g) was adopted to prepare walnut shell-based biochar with high microporosity and the effect of pore structure on CO2 adsorption performance at different temperatures was investigated. The prepared biochar had a larger specific surface area (2647.8 m2 g−1), satisfactory micropore area (2008.7 m2 g−1) and high total pore volume (2.58 cm3 g−1). At 273 K and 298 K, its CO2 adsorption capacity was 4.79 mmol g−1 and 3.20 mmol g−1, respectively. Particularly, CO2 adsorbed uptake on biochar was strongly sensitive to their narrow micropore volume, instead of the total specific surface area, total pore volume, and micropore specific surface area. The optimal pore size beneficial for CO2 adsorption was 0.33–0.82 nm at 273 K, but the optimal pore size was 0.33–0.39 nm at 298 K. It provides theoretical guidance for future material preparation and selection, and FeCl3, ZnCl2 and H2O(g) may be effective biochar activators.
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Adsorption capacity of biochar is affected by porosity, alkalinity, surface functional groups, mineral content, hydrophilicity and hydrophobicity.
“Adsorption capacity of biochar is affected by many factors, such as porosity (Guo et al. 2022), alkalinity (Kumar etal. 2015), surface functional groups (Torrisi et al. 2010), mineral content (Li et al. 2017), hydrophilicity and hydrophobicity (Dissanayake etal. 2020).”
From Lignin-impregnated biochar assisted with microwave irradiation for CO2 capture: adsorption performance and mechanism (2024) · cites this paper as Guo et al. 2022
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- Authors
- Guo, T., Tian, W., & Wang, Y.
- Affiliations
- Ningxia University (CN)
- North Minzu University (CN)
- Corresponding author
- Wang, Yanxia
- ORCID
- Venue
- Atmosphere
- Publisher
- MDPI AG
- Published
- 2022-07-14
- Volume
- 13
- Issue
- 7
- Pages
- 1110
- ISSN
- 2073-4433 (ISSN-L)
- OpenAlex
- W4285596975
- Cited by
- 32
- References
- 44
- Citations by year
- 2026: 13 · 2025: 5 · 2024: 9 · 2023: 3 · 2022: 2
- FWCI
- 1.79
- 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
- National Natural Science Foundation of China (U20A20124, 2022AAC03251, 2018BCE01002)
- Natural Science Foundation of Ningxia Province (U20A20124, 2022AAC03251, 2018BCE01002)
- Major Project of the Key Research and Development Program of Ningxia Province, China (U20A20124, 2022AAC03251, 2018BCE01002)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Keywords
- walnut shell biochar, CO2 adsorption, pore structure, CO activation, ferric chloride, zinc chloride, water vapor activation, microporosity, specific surface area, temperature dependence
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