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Oxidative Degradation of 2,4-Dihydroxybenzoic Acid by the Fenton and Photo-Fenton Processes: Kinetics, Mechanisms, and Evidence for the Substitution of H2O2 by O2

✍ Scribed by Ménana Haddou; Florence Benoit-Marquié; Marie-Thérèse Maurette; Esther Oliveros

Publisher
John Wiley and Sons
Year
2010
Tongue
German
Weight
467 KB
Volume
93
Category
Article
ISSN
0018-019X

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✦ Synopsis

The kinetics and mechanisms of the oxidative degradation of 2,4-dihydroxybenzoic acid (2,4-DHBA) by the Fenton and photo-Fenton processes were investigated in detail by a combination of HPLC, IC, and TOC analyses. The formation of 2,3,4-trihydroxybenzoic acid (2,3,4-THBA) at an early oxidation stage shows that hydroxylation of the aromatic ring is the first step of the process. This intermediate was able to reduce Fe III and to contribute to the recycling of Fe II . Complete mineralization could only be achieved under irradiation (photo-Fenton). A detailed study of the dependence of the rate of mineralization on the concentration of H 2 O 2 and dissolved O 2 was carried out. It was found that, even at a low initial concentration of H 2 O 2 , mineralization by the photo-Fenton process was complete in a relatively short time, provided that the O 2 concentration was high enough, indicating that O 2 may, at least in part, substitute H 2 O 2 . Channeling reaction pathways toward O 2 rather than H 2 O 2 consumption is of particular interest for the technical development of the photo-Fenton process.

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