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Cited by 43Thermochemical Biomass Conversion ProcessesSoil Carbon and Nitrogen DynamicsAdsorption and biosorption for pollutant removal

Influence of pyrolysis temperature and time on biochar properties and its potential for climate change mitigation

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Wijitkosum, Saowanee·2023·Journal of Human, Earth, and Future
DOI 10.28991/hef-2023-04-04-07
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Abstract

The thermochemical conversion of disposable bamboo chopstick (DBC) wastes into biochar is a practical strategy for converting waste into resources. This study aimed to investigate the effects of pyrolysis temperature and holding time on the physicochemical properties of DBC biochar and its potential for climate change mitigation. Properties affecting the biochar efficiency and potential for application were analyzed: moisture content (MC), volatile matter (VM), fixed carbon (FC), ash, pH, and carbon (C), hydrogen (H), nitrogen (N), and oxygen (O) content. Six different pyrolysis conditions were studied, with temperatures of 400 °C, 450 °C, and 500 °C and holding times of 20 and 60 min, at a constant heating rate. The results demonstrated that temperature and holding time significantly affected the physicochemical properties and performance of the biochar. Increases in %C, %FC, %N, and pH and reductions in %MC, %VM, %H, and %O were found when the temperature was increased at different holding times. The aromaticity increased and the polarity decreased significantly with increasing temperature and holding time. The results showed that temperature interacts significantly with holding time, and these two factors jointly affect the contents of MC, ash, FC, C, H, N, and O (R2 of 0.997) and pH (R2of 0.999). The DBC biochar obtained via pyrolysis at 450 °C and 500 °C for 20 and 60 min could be applied for climate change mitigation. The best DBC biochar was obtained at a pyrolysis temperature of 500 °C and a holding time of 20 min. This biochar showed good hydrophobicity, tremendous stability, the highest C (88.06%) and FC (76.49%) values, and the lowest ash (2.62%) and VM (19.23%) contents. Doi: 10.28991/HEF-2023-04-04-07 Full Text: PDF

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  • Increasing pyrolysis temperature to 800 °C drove further deoxygenation and dehydrogenation, with Van Krevelen parameters H/C = 0.21 and O/C = 0.05.

    “Increasing pyrolysis temperature to 800 • C via B800 drove further deoxygenation and dehydrogenation, with Van Krevelen parameters (H/C = 0.21; O/C = 0.05) confirming heightened aromaticity and carbon enrichment [69,70].”

    From Pilot-Scale Slow Pyrolysis, Post-Heat Treatment, and Self-Heating Performance of Biochar Fuels Derived from Construction, Renovation, and Demolition (CRD) Wood Waste (2026) · cites this paper as [69]

    The Chopstick Waste section reports that increasing pyrolysis temperature lowered H/C and O/C ratios, indicating greater aromaticity and carbon enrichment. However, Methods §2.2 says the study tested only 400, 450, and 500 °C; Table 6 reports O/C = 0.05 at 500 °C, paired with H/C = 0.45, not 0.21. It does not support the claimed B800 condition or its paired ratios. (LLM, conf=0.89)

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Authors
Wijitkosum, S.
Affiliations
Chulalongkorn University (TH)
Corresponding author
Wijitkosum, Saowanee
ORCID
Wijitkosum, Saowanee
Venue
Journal of Human, Earth, and Future
Publisher
Ital Publication
Published
2023-12-01
Volume
4
Issue
4
Pages
472-485
ISSN
2785-2997 (ISSN-L)
DOI
10.28991/hef-2023-04-04-07
OpenAlex
W4391290522
Cited by
43
References
86
Citations by year
2026: 9 · 2025: 12 · 2024: 22
FWCI
3.40
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Human Earth and Future (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Greater South Information System
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
Keywords
biochar, pyrolysis temperature, holding time, waste-to-energy, physicochemical properties, climate change mitigation, hydrophobicity, aromaticity, fixed carbon, carbon sequestration

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