Journal
BIORESOURCES
Volume 12, Issue 1, Pages 2040-2057Publisher
NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI
DOI: 10.15376/biores.12.1.2040-2057
Keywords
Pyrolysis conditions; Biochar; Physicochemical properties; Polycyclic aromatic hydrocarbons
Categories
Funding
- FONDECYT [3140630, 1150707]
- DIUFRO [D116-0138]
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The effects of the pyrolysis conditions in terms of temperature (400 to 600 degrees C), residence time (0.5 to 3.5 h), nitrogen flux (0 to 1 L/min), and temperature increase rate (1.5 to 3 degrees C/min) on the physicochemical properties of biochar were studied. The physicochemical properties evaluated in the biochar were specific surface area, pore volume, average pore size, total carbon content, pH, total acidity, elemental composition, and polycyclic aromatic hydrocarbons (PAHs) content. A higher specific surface area of 108.28 m(2)/g and a mean pore size diameter of about 2.24 nm were found when the pyrolysis was conducted at 600 degrees C. In general, the pH and total acidity increased with the increased pyrolysis temperature. The total PAH concentration in all of the combinations studied varied from 0.16 to 8.73 mu g/kg, and only phenanthrene, pyrene, and chrysene were detected. The increased temperature seemed to decrease the PAH concentration in the biochar. Nevertheless, there was no correlation found between the PAH content and the combined evaluated parameters.
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