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Journal of the Brazilian Chemical Society

Print version ISSN 0103-5053


FRIEDRICH, Leidi Cecilia et al. Mechanistic implications of zinc(II) ions on the degradation of phenol by the fenton reaction. J. Braz. Chem. Soc. [online]. 2012, vol.23, n.7, pp.1372-1377. ISSN 0103-5053.

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.

Keywords : phenol; Zn2+ ions; Fenton reaction.

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