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Improving the circular economy and sustainability of the winemaking industry via a new technology for the valorization of its waste

AuthorsF.A.López; Teresa A. Centeno; Carmen Martínez
KeywordsWinemaking wastes
Hydrothermal carbon
Activated carbon
Methylene blue Adsorption.
Issue Date5-Nov-2017
AbstractThis work reports the preparation of activated carbons via the hydrothermal treatment at 250ºC/30 bars of two common winemaking wastes: bagasse and cluster stalks. The hydrothermal carbons produced by the above treatment were turned into activated carbons via their exposure to KOH and carbonisation at 800ºC. These were then subjected to Raman spectroscopy, FTIR spectroscopy, SEM examination, and the determination of their BET surface area. The ability of the activated carbons to adsorb methylene blue (MB) in aqueous solution was then examined, determining the influence of time, MB concentration, and temperature. Equilibrium conditions were reached for reaction times between 180 and 240 min at pH 7. The adsorption isotherms were found to better fit the Langmuir than the Freundlich model, and the adsorption kinetics fitted a pseudo-second order model. The maximum adsorption at 30ºC was 714-847 mg g-1. Thermodynamic studies revealed the adsorption of MB to be spontaneous and exothermic. These results show that high quality activated carbons can be produced from winemaking waste.
Appears in Collections:(CENIM) Comunicaciones congresos
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