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Artigo Produção Nacional Revisado por pares
BIBTEX RIS

Ironporphyrin immobilized onto montmorillonite as a biomimetical model for azo dye oxidation

2007; Elsevier BV; Volume: 61; Issue: 4 Linguagem: Inglês

10.1016/j.ibiod.2007.10.008

ISSN

1879-0208

Autores

Valéria P. Barros, André Luiz de Faria, Tatiana C.O. MacLeod, Luiz Alberto Beraldo de Moraes, Marilda das Dores Assis,

Tópico(s)

Enzyme-mediated dye degradation

Resumo

In this work, we studied the oxidation of the azo dye Disperse Orange 3 (DO3) by hydrogen peroxide, catalyzed by 5,10,15,20-tetrakis(4-N-methylpyridyl)porphyrin iron(III) chloride immobilized onto montmorillonite K10, FeP-K10. Results showed that the FeP-K10/H2O2 system is efficient for discoloration of the DO3 dye, especially at pH 3.0. The catalyst was shown to be relatively stable and could be recycled many times, leading to good yields. DO3 oxidation products were analyzed by gas chromatography and mass spectrometry, being 4-nitroaniline the main product. Tert-butylhydroperoxide and iodosylbenzene were also used as oxidants, giving rise to 4-nitroaniline as product too. The studied system is a good biomimetic model of oxidative enzymes, being a promising discoloring agent for azo dyes.

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