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- Title
Oxidative Degradation of 2,4Dihydroxybenzoic Acid by the Fentonand PhotoFentonProcesses: Kinetics, Mechanisms, and Evidence for the Substitution of H2O2by O2.
- Authors
Ménana Haddou; Florence BenoitMarquié; MarieThérèse Maurette; Esther Oliveros
- Abstract
The kinetics and mechanisms of the oxidative degradation of 2,4dihydroxybenzoic acid 2,4DHBA by the Fentonand photoFentonprocesses were investigated in detail by a combination of HPLC, IC, and TOC analyses. The formation of 2,3,4trihydroxybenzoic acid 2,3,4THBA 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 FeIIIand to contribute to the recycling of FeII. Complete mineralization could only be achieved under irradiation photoFenton. A detailed study of the dependence of the rate of mineralization on the concentration of H2O2and dissolved O2was carried out. It was found that, even at a low initial concentration of H2O2, mineralization by the photoFentonprocess was complete in a relatively short time, provided that the O2concentration was high enough, indicating that O2may, at least in part, substitute H2O2. Channeling reaction pathways toward O2rather than H2O2consumption is of particular interest for the technical development of the photoFentonprocess.
- Subjects
BENZOIC acid; OXIDATION; CHEMICAL kinetics; REACTION mechanisms (Chemistry); SUBSTITUTION reactions; PHOTODEGRADATION; HYDROGEN peroxide; OXYGEN
- Publication
Helvetica Chimica Acta, 2010, Vol 93, Issue 6, p1067
- ISSN
0018-019X
- Publication type
Article
- DOI
10.1002/hlca.200900380