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Author(s): Carmen S. D. Rodrigues
S. A. C. Carabineiro
F. J. Maldonado-Hódar
Luís M. Madeira
Title: Wet peroxide oxidation of dye-containing wastewaters using nanosized Au supported on Al2O3
Issue Date: 2017
Abstract: The degradation of a model dye compound (Orange II) was evaluated by wet peroxide oxidation using goldsupported on alumina (Au/Al2O3) as a catalyst, in a slurry batch reactor. The material was prepared by thedeposition-precipitation method, which yielded nanosized gold particles well dispersed on the support,with a mean particle size of 3.6 nm. It was concluded that both adsorption and catalyzed oxidation (viahydroxyl radical formation) contribute to the dye removal. The catalyst was reused for five consecutivecycles, with no Au leaching being detected into the solution (detection limit <0.5 mg/L), showing itshigh stability. This was also confirmed by textural and chemical characterization of the fresh and usedmaterials. A parametric study was carried out to assess the influence of the most important variables(hydrogen peroxide amount, catalyst concentration, reaction pH and temperature) in both dye and totalorganic carbon (TOC) removal. In all runs performed, gold leaching was not detected. In the best operatingconditions found, high efficiencies were reached (i.e., ∼100% of dye removal, 50% of TOC reduction, 42%of chemical oxygen demand - COD - elimination). The treatment improved the biodegradability of theeffluent and the obtained waste remained non-toxic (as inferred from the inhibition of Vibrio fischeritest).A simulated industrial acrylic dyeing effluent was also treated by wet peroxidation. It was found thatthe gold support on alumina catalyst was stable and achieved considerable removal of color (33%) andorganic compounds (42% for TOC and 50% for COD) and improved the biodegradability of the wastewater
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/UID/EQU/00511/2013 - POCI-01-0145-FEDER-006939/Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia/LEPABE
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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