Mechanism of Water Oxidation by Ferrate(VI) at pH 7–9

Gui Chen, William W.Y. Lam, Po Kam Lo, Wai Lun MAN, Lingjing Chen, Kai Chung Lau*, Tai Chu Lau

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

24 Citations (Scopus)


The kinetics of water oxidation by K2FeO4 has been reinvestigated by UV/Vis spectrophotometry from pH 7–9 in 0.2 m phosphate buffer. The rate of reaction was found to be second-order in both [FeO4 2−] and [H+]. These results are consistent with a proposed mechanism in which the first step involves the initial equilibrium protonation of FeO4 2− to give FeO3(OH), which then undergoes rate-limiting O−O bond formation. Analysis of the O2 isotopic composition for the reaction in H2 18O suggests that the predominant pathway for water oxidation by ferrate is intramolecular O−O coupling. DFT calculations have also been performed, which support the proposed mechanism.

Original languageEnglish
Pages (from-to)18735-18742
Number of pages8
JournalChemistry - A European Journal
Issue number70
Publication statusPublished - 12 Dec 2018

Scopus Subject Areas

  • Catalysis
  • Organic Chemistry

User-Defined Keywords

  • DFT calculations
  • diferrate
  • ferrate
  • O−O coupling
  • water oxidation


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