A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Degradation of Monoazo Pigments Red 53:1 and Red 48:2 by Fenton, Photo‐Fenton and UV/Peroxide Reactions
10.1002/clen.200900108.abs
The degradation reactions of two monoazo pigments, namely, Red 53:1 and Red 48:2, by Fenton, photo‐Fenton and UV/H2O2 systems have been studied. The efficiencies of the Fenton reactions increased with temperature, but the formation of solid agglomerates was observed when the reactions were carried out above 50°C indicating a coagulant action of Fe+2 or Fe+3. Photo‐Fenton reactions irradiated by sunlight presented the best rate constants for cleavage of the azo bond and the naphthalene rings. The UV/H2O2 system exhibited the highest efficiency with respect to the consumption of H2O2. The presence of a carbonyl group in theortho position of the naphthol ring hampered the oxidation of pigment Red 48:2 by hydroxyl radicals. This finding may be explained in terms of the acceptor character of the COOH group, and suggests the formation of a complex containing two six‐membered rings between Fe+3 and the pigment molecule.
Degradation of Monoazo Pigments Red 53:1 and Red 48:2 by Fenton, Photo‐Fenton and UV/Peroxide Reactions
10.1002/clen.200900108.abs
The degradation reactions of two monoazo pigments, namely, Red 53:1 and Red 48:2, by Fenton, photo‐Fenton and UV/H2O2 systems have been studied. The efficiencies of the Fenton reactions increased with temperature, but the formation of solid agglomerates was observed when the reactions were carried out above 50°C indicating a coagulant action of Fe+2 or Fe+3. Photo‐Fenton reactions irradiated by sunlight presented the best rate constants for cleavage of the azo bond and the naphthalene rings. The UV/H2O2 system exhibited the highest efficiency with respect to the consumption of H2O2. The presence of a carbonyl group in theortho position of the naphthol ring hampered the oxidation of pigment Red 48:2 by hydroxyl radicals. This finding may be explained in terms of the acceptor character of the COOH group, and suggests the formation of a complex containing two six‐membered rings between Fe+3 and the pigment molecule.
Degradation of Monoazo Pigments Red 53:1 and Red 48:2 by Fenton, Photo‐Fenton and UV/Peroxide Reactions
Ilha, Clóvis E. G. (author) / dos Santos, Antônio J. M. G. (author) / SouzaDe, Jurandir R. (author)
CLEAN – Soil, Air, Water ; 37 ; 799-805
2009-10-01
7 pages
Article (Journal)
Electronic Resource
English
Oxidative degradation of sulfathiazole by Fenton and photo-Fenton reactions
| Online Contents | 2014
Oxidative degradation of sulfathiazole by Fenton and photo-Fenton reactions
| Taylor & Francis Verlag | 2014
Degradation of Phenol in Aqueous Solution by Fenton, Sono‐Fenton and Sono‐photo‐Fenton Methods
| Online Contents | 2011