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Apple Waste: A Sustainable Source of Carbon Materials and Valuable Compounds

AuthorsGuardia, Laura CSIC ; Suárez Fernández, Loreto ; Querejeta Montes, Nausika CSIC ORCID ; Rodríguez Madrera, Roberto; Suárez, Belén; Álvarez Centeno, Teresa CSIC ORCID
KeywordsApple waste
Porous carbon
Hydrothermal carbonization
Bioactive compounds
Issue Date26-Sep-2019
PublisherAmerican Chemical Society
CitationACS Sustainable Chemistry Engineering 7(20): 17335-17343 (2019)
AbstractThe implementation of sustainable strategies based on the integral valorization of residues is the most efficient way to achieve a profitable circular economy. This comprehensive study highlights the potential of apple waste from juice and cider production as a precursor of porous carbons and provides guidelines to achieve a wide spectrum of physicochemical properties. Hydrothermal carbonization (HTC) of apple bagasse is proposed as a feasible integrated process with zero waste that allows stabilizing this highly pollutant residue in the form of a carbon-enriched solid while extracting valuable compounds in the aqueous phase. The liquid fraction resulting from HTC at 200 °C contains a high total phenolic content and antioxidant activity, the major products being catechol (1,2-dihydroxybenzene) and 5-hydroxymethyl-2-furfural (HMF). The successful upgrading of the solid byproduct into porous carbons provides additional advantage for a more cost-effective waste management. It is reported that a simple one-step activation leads to apple-derived carbons with specific surface areas up to 2000 m2 g–1 and electrochemical capacitances as high as 260–290 F g–1. Their excellent performance as supercapacitor electrodes make them very promising for the storage of electrical energy from renewable sources.
DescriptionThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sustainable Chemistry and Engineering, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acssuschemeng.9b04266
Publisher version (URL)https://doi.org/10.1021/acssuschemeng.9b04266
Appears in Collections:(INCAR) Artículos
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