Lignocellulosic waste was transformed into high-added value materials, hydrochars, through hydrothermal carbonization. The influence of temperature and residence time on the properties of the hydrochars derived from rice husk and exhausted black wattle bark was evaluated. Hydrothermal carbonization enhanced carbon content in the solid material by more than 30% in both materials. As temperature and residence time increased, however, process yield decreased between 3 and 27%. Porosity was created in the solid material during hydrothermal carbonization; a specific surface area value of 45 m2 g−1 was attained. The presence of oxygenated functional groups and aromatic rings was also evidenced by the carbonization treatment. Thus, hydrothermal carbonization of rice husk and exhausted black wattle bark was efficient for improving carbon content, porosity, and functionality in the solid material.
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