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

Journal of the Brazilian Chemical Society

Friedrich, Leidi Cecilia¹  Universidade Federal de Mato Grosso do Sul, Campo Grande, Brazil¹  Silva, Volnir Oliveira¹  Mendes, Maria Anita¹  Universidade de São Paulo, São Paulo, Brazil¹  Machulek Jr., Amilcar¹  Universidade Federal de Alagoas, Maceió, Brazil¹  Quina, Frank Herbert¹  Zanta, Carmem Lúcia P. S.¹ 

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

DOI  :  10.1590/S0103-50532012000700022

学科分类：化学（综合）

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】

Unknown