Effects of Pyrolysis Conditions on Physicochemical Properties of Oat Hull Derived Biochar

24 octubre, 2017 -


Maria Eugenia González(a), Luis Romero-Hermoso(b), Gonzalez, Aixa(a); Hidalgo, Pamela(b); Meier, Sebastian (b)(c); Navia, Rodrigo(b)(d) (e); Cea, Mara(b)(d)


(a) Núcleo de Investigación en Bioproductos y Materiales Avanzados (BioMA), Dirección de Investigación, Universidad Católica de Temuco, Temuco, Chile (b) Scientific and Technological Bio Resources Nucleus-BIOREN, University of La Frontera, Av. Francisco Salazar 01145, Temuco, Chile ( c) Instituto Nacional de Investigaciones Agropecuarias. INIA Carillanca, Casilla Postal 58-D, Temuco, Chile (d) Department of Chemical Engineering, University of La Frontera, Av. Francisco Salazar 01145, Temuco, Chile (e) Centre for Biotechnology and Bioengineering (CeBiB), University of La Frontera, Av. Francisco Salazar 01145, Temuco, Chile


BIORESOURCES

Volumen: 12(1)  Páginas: 2040-2057

DOI: https://doi.org/10.15376/biores.12.1.2040-2057

Fecha de publicación: 2017


Abstract

The effects of the pyrolysis conditions in terms of temperature (400 to 600 7deg;C), residence time (0.5 to 3.5 h), nitrogen flux (0 to 1 L/min), and temperature increase rate (1.5 to 3 °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 m2/g and a mean pore size diameter of about 2.24 nm were found when the pyrolysis was conducted at 600 °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 μg/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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