Oxidation of activated carbon: application to vinegar decolorization.
This article reports studies on the feasibility of increasing the decoloring capacity of a granular activated carbon (GAC) by using oxidation with air at 350 degrees C to modify its surface activity and porosity. The GAC, obtained from olive stones, had a maximum decolorization capacity of 92% for doses of 20 g/l, while the maximum decolorization capacity of the modified granular activated carbon (MGAC) was about 96% at a dose of 10 g/l. The increase in decoloring capacity is thought to be due to an increase in mesopore area (from 129 to 340 m2/g) in the MGAC. The maximum decoloring values and the doses needed to attain them are very close to values obtained in previous studies using coconut shell powder-activated carbon (94 and 98% for red and white vinegar for a dose of 10 g/l, respectively).
López
Francisco
F
Departament d'Enginyeria Química, Unitat d'Enologia del CeRTA Generalitat de Catalunya, Facultat d'Enologia, Universitat Rovira i Virgili, Ramón y Cajal 70, 43005 Tarragona, Spain. flopez@etseq.urv.es
Medina
Francisco
F
Prodanov
Marin
M
Güell
Carme
C
D019342:Acetic Acid / Q000737:chemistry / Q000302:isolation & purification*; D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D003116:Color; D009584:Nitrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry; D016062:Porosity; D013053:Spectrophotometry; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
D010636:Phenols; D002606:Charcoal; D009584:Nitrogen; D019342:Acetic Acid