| Title | Apple Waste: A Sustainable Source of Carbon Materials and Valuable Compounds |
|---|---|
| ID_Doc | 9152 |
| Authors | Guardia, L; Suárez, L; Querejeta, N; Madrera, RR; Suárez, B; Centeno, TA |
| Title | Apple Waste: A Sustainable Source of Carbon Materials and Valuable Compounds |
| Year | 2019 |
| Published | Acs Sustainable Chemistry & Engineering, 7.0, 20 |
| Abstract | The 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 degrees 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 m(2) 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. |
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