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(a) Cumulative particle size distribution of the raw sunflower husk pellet (squares) and thermally processed material at 650 °C (circles). The fine fraction of biochar ( < 212 µm) accounts for approximately 20% of the total volume. (b) Results of the pore diameter vs. specific pore volume for the raw and pyrolyzed (at 650 °C) material. After the thermal processing, the biomass increased its specific pore volume, which was the most evident above the 0.3 µm pore diameter.
