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601000 
Journal Article 
Ironporphyrin immobilized onto montmorillonite as a biomimetical model for azo dye oxidation 
Barros VrP; Faria, AL; MacLeod, TCO; Moraes, LAB; Assis, MD 
2008 
1 
International Biodeterioration & Biodegradation
ISSN: 0964-8305
EISSN: 1879-0208 
61 
4 
337-344 
Abstract: 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. [Copyright 2008 Elsevier] Copyright of International Biodeterioration & Biodegradation is the property of Elsevier Science Publishing Company, Inc. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts) 
MONTMORILLONITE; OXIDATION; CATALYSTS; MASS spectrometry