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

Journal of the Brazilian Chemical Society

Leidi Cecilia Friedrich²  Maria Anita Mendes¹  Volnir Oliveira Silva²  Carmem Lúcia P. S. Zanta¹  Amilcar Machulek Jr.¹  Frank Herbert Quina² 

[1] ,Universidade de São Paulo Instituto de Química São Paulo SP ,Brazil

关键词: phenol;    Zn2+ ions;    Fenton reaction;   

DOI  :  10.1590/S0103-50532012000700022

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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