Mechanistic implications of zinc(II) ions on the degradation of phenol by the fenton reaction

A study of the interference of Zn2+ ions on phenol degradation by Fenton reaction (Fe2+/Fe3+ + H2O2) is reported. One of the first intermediates formed in the reaction, catechol, can reduce Fe3+ to Fe2+ and, in the presence of H2O2 initiates an efficient catalytic redox cycle. In the initial stages...

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Bibliographic Details
Published in:Journal of the Brazilian Chemical Society 2012-07, Vol.23 (7), p.1372-1377
Main Authors: Friedrich, Leidi Cecilia, Mendes, Maria Anita, Silva, Volnir Oliveira, Zanta, Carmem Lúcia P. S., Machulek Jr, Amilcar, Quina, Frank Herbert
Format: Article
Language:English
Subjects:
CHEMISTRY, MULTIDISCIPLINARY
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Summary:A study of the interference of Zn2+ ions on phenol degradation by Fenton reaction (Fe2+/Fe3+ + H2O2) is reported. One of the first intermediates formed in the reaction, catechol, can reduce Fe3+ to Fe2+ and, in the presence of H2O2 initiates an efficient catalytic redox cycle. In the initial stages of the reaction, this catechol-mediated cycle becomes the principal route of thermal degradation of phenol and its oxidation products. The Zn2+ ion addition enhances the persistence time of catechol, probably by stabilization of the corresponding semiquinone radical via complexation.
ISSN:0103-5053
1678-4790
DOI:10.1590/S0103-50532012000700022