New insight into photochemical oxidation of Fe(II): The roles of Fe(III) and reactive oxygen species

- UV, Fe(III) and oxygen are indispensable for Fe(II) photooxidation.
- HO2 is the most critical reactive oxygen species for Fe(II) oxidation at pH 3.0.
- A Fe(III)-photosensitized oxidation mechanism of Fe(II) was proposed.