Artículos de revistas
Ironporphyrin immobilized onto montmorillonite as a bimimetical model for azo dye oxidation
Fecha
2008Registro en:
INTERNATIONAL BIODETERIORATION & BIODEGRADATION, v.61, n.4, p.337-344, 2008
0964-8305
10.1016/j.ibiod.2007.10.008
Autor
BARROS, Valeria P.
FARIA, Andre L.
MACLEOD, Tatiana C. O.
MORAES, Luiz A. B.
ASSIS, Marilda D.
Institución
Resumen
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. (C) 2007 Elsevier Ltd. All rights reserved.