Efficient azo dye degradation by hydrogen peroxide oxidation with metalloporphyrins as catalysts

An efficient azo dye degradation system using diluted hydrogen peroxide solutions as oxidant and metalloporphyrins as catalysts is disclosed. ▪ Degradation of organic dyes is a matter of great environmental concern. Despite many significant efforts and the numerous systems, which have been exploited...

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Bibliographic Details
Published in:Journal of molecular catalysis. A, Chemical Chemical, 2005-09, Vol.238 (1), p.192-198
Main Authors: Serra, Arménio C., Docal, Cristina, Rocha Gonsalves, A.M.d’A.
Format: Article
Language:English
Subjects:
Azo dye degradation
Catalysis
Chemistry
Environment
Exact sciences and technology
General and physical chemistry
Hydrogen peroxide
Metalloporphyrin
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:An efficient azo dye degradation system using diluted hydrogen peroxide solutions as oxidant and metalloporphyrins as catalysts is disclosed. ▪ Degradation of organic dyes is a matter of great environmental concern. Despite many significant efforts and the numerous systems, which have been exploited, the problem is still unsolved due to intrinsically low activity or use of non-convenient chemical reagents. In this work, we describe the use of an oxidative system based on hydrogen peroxide activated by metalloporphyrins as catalysts to carry out the degradation of methyl orange, a model azo dye, in fairly high concentrations. Some inhibition of the catalytic activity during the reaction was originally observed. Adjustments in the system were made in order to prevent this inhibition and improve the efficiency of the system.
ISSN:1381-1169
1873-314X
DOI:10.1016/j.molcata.2005.05.017