Activated carbons from hydrothermal carbonization and chemical activation of olive stones: application in sulfamethoxazole adsorption
Entity
UAM. Departamento de Ingeniería QuímicaPublisher
MDPIDate
2022-05-01Citation
10.3390/resources11050043
Resources 11.5 (2022): 43
ISSN
2079-9276 (online)DOI
10.3390/resources11050043Project
Gobierno de España. PID2019-108445RB-I00; Comunidad de Madrid. S2018/EMT-4344/BIOTRES-CMEditor's Version
https://doi.org/10.3390/resources11050043Subjects
Hydrothermal Carbonization; Hydrochars; Carbon; QuímicaRights
© 2022 by the authorsAbstract
This work focuses on the production of activated carbons by hydrothermal carbonization of olive stones at 220 °C, followed by chemical activation with KOH, FeCl3 and H3PO4 of the hydro-char obtained. In addition, N-doped hydrochars were also obtained by performing the hydrothermal carbonization process with the addition of (NH4)2SO4. All hydrochars, N-doped and non-doped, showed low BET surface areas (4–18 m2 g−1). Activated hydrochars prepared using H3PO4 or KOH as activating agents presented BET surface areas of 1115 and 2122 m2 g−1, respectively, and those prepared from N-doped hydrochar showed BET surface area values between 1116 and 2048 m2 g−1 with an important contribution of mesoporosity (0.55–1.24 cm3 g−1). The preparation procedure also derived inactivated hydrochars with predominantly acidic or basic groups on their surface. The resulting materials were tested in the adsorption of sulfamethoxazole in water. The adsorption capacity depended on both the porous texture and the electrostatic interactions between the adsorbent and the adsorbate. The adsorption equilibrium data (20 °C) fitted fairly well to the Langmuir equa-tion, and even better to the Freundlich equation, resulting in the non-doped hydrochar activated with the KOH as the best adsorbent
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Google Scholar:Díaz Nieto, Elena
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Sanchis, Ines
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Coronella, Charles J.
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Fernández Mohedano, Ángel
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