Low-Cost Activated Grape Seed-Derived Hydrochar through Hydrothermal Carbonization and Chemical Activation for Sulfamethoxazole Adsorption

Activated carbons were prepared by chemical activation with KOH, FeCl3 and H3PO4 of the chars obtained via hydrothermal carbonization of grape seeds. The hydrochars prepared at temperatures higher than 200 °C yielded quite similar proximate and ultimate analyses. However, heating value (24.5–31.4 MJ...

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Bibliographic Details
Published in:Applied sciences 2019-12, Vol.9 (23), p.5127
Main Authors: Diaz, Elena, Manzano, Francisco Javier, Villamil, John, Rodriguez, Juan Jose, F. Mohedano, Angel
Format: Article
Language:English
Subjects:
Activated carbon
Adsorbents
Adsorption
Aqueous solutions
Biomass
Calorific value
Carbon dioxide
Carbonization
Efficiency
Energy
Ferric chloride
Flux density
Grapes
Morphology
Pollutants
Scanning electron microscopy
Seeds
Stainless steel
Sulfamethoxazole
Surface area
Surface chemistry
Surface layers
Waste management
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Summary:Activated carbons were prepared by chemical activation with KOH, FeCl3 and H3PO4 of the chars obtained via hydrothermal carbonization of grape seeds. The hydrochars prepared at temperatures higher than 200 °C yielded quite similar proximate and ultimate analyses. However, heating value (24.5–31.4 MJ·kg−1) and energy density (1.04–1.33) significantly increased with carbonization temperatures between 180 and 300 °C. All the hydrochars showed negligible BET surface areas, while values between 100 and 845 m2·g−1 were measured by CO2 adsorption at 273 K. Activation of the hydrochars with KOH (activating agent to hydrochar ratio of 3:1 and 750 °C) led to highly porous carbons with around 2200 m2·g−1 BET surface area. Significantly lower values were obtained with FeCl3 (321–417 m2·g−1) and H3PO4 (590–654 m2·g−1), showing these last activated carbons important contributors to mesopores. The resulting materials were tested in the adsorption of sulfamethoxazole from aqueous solution. The adsorption capacity was determined by the porous texture rather than by the surface composition, and analyzed by FTIR and TPD. The adsorption equilibrium data (20 °C) fitted the Langmuir equation well. The KOH-activated carbons yielded fairly high saturation capacity reaching up to 650 mg·g−1.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9235127