Abstract
Purpose
Daniellia oliveri sheds a large quantity of leaves in the dry season in sub-Saharan Africa. Retort carbonization is a recent biomass conversion technique where the flue gas generated in the product zone is re-combusted in the heating zone to produce BC. This work shows that good-quality biochar (DO-BC) can be obtained from the retort carbonization of these leaves. We also show that the utilization of cow dung as co-feed improves the quality of the BC obtained (DC-BC).
Methods
The process was conducted at ambient pressure and 100 min of process time. The BC yield for DO-BC was 28.01% at a peak temperature of 382.2 °C and 38.69% for DC-BC at a peak temperature of 361.6 °C. The BCs were characterized by Scanning Electron Microscopy (SEM), Energy Dispersive Xray Spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), Differential Thermal Analysis/Thermogravimetric Analysis (DTA/TGA), and Brunauer–Emmett–Teller (BET) analysis.
Results
The specific surface increased from 114 m2/g for DO-BC to 174 m2/g for DC-BC respectively. Cow dung co-feed led to significant morphological differences in the BC. DC-BC had more surface heterogeneity and more inorganic elements. The average roughness was 31.25 × 103 μm for DO-BC and 29.21 × 103 μm for DC-BC respectively. Functional groups like C–H, C–O, C=C, O–H, and C–N were observed in the BCs and the cow dung co-feed led to more C–O and C–H functional groups in the BC. The BCs showed similar thermal characteristics with a maximum thermal degradation temperature of around 400 °C.
Conclusions
It was surmised that the systematic addition of a secondary component to the feedstock can improve the yield and surface properties of the final BC obtained.
Graphical Abstract
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Data Availability
All data generated or analyzed during this study are included in this published article (and its supplementary information files).
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JOI (conceptualization; data curation; methodology; writing—original draft; writing—review & editing; resources), CAA (conceptualization; data curation; methodology), KOI (writing—original draft; writing - review & editing), ECE (writing—original draft; writing—review & editing), AGA (conceptualization; writing—review & editing; supervision; validation; project administration; resources).
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Ighalo, J.O., Adeyanju, C.A., Iwuozor, K.O. et al. Retort Co-carbonization of Daniellia oliveri Leaves: Effect of Cow Dung Co-feed on Biochar Properties. Waste Biomass Valor (2024). https://doi.org/10.1007/s12649-024-02461-z
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DOI: https://doi.org/10.1007/s12649-024-02461-z