Mechanism of the Fenton reaction. Evidence for a new intermediate

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Publication Date
DOI 10.1039/A903915E
Impact Factor 3.676
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Abstract

For the first time, the time dependence of the amount of O2 evolved in the reaction of Fe2+ with H2O2 (the Fenton reaction) was measured by following the decrease of the total [Fe3+] formed upon quenching the reaction mixture with an excess of a strongly acidic solution of Fe2+. The disappearance of Fe2+ in the reaction was followed by quenching it with o-phenanthroline and measuring the absorbance of the Fe2+-phenanthroline complex formed at λ=510 nm. At [H2O2]<10-4 mol dm-3, and quenching the reaction with Fe2+ ions, the formation of a new intermediate was observed. It was identified as the mixed valence binuclear species {FeOFe}5+. A new mechanism for the reaction has been proposed in which FeO2+ acts as the key intermediate. Several rate constants and ratios of rate constants have been determined. The existence of free radicals in the system does not seem to be compatible with the data.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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