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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Gui Chen
  • William W. Y. Lam
  • Po-Kam Lo
  • Wai-Lun Man
  • Lingjing Chen

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)18735-18742
Journal / PublicationChemistry - A European Journal
Volume24
Issue number70
Online published27 Sep 2018
Publication statusPublished - 12 Dec 2018

Abstract

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.

Research Area(s)

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

Citation Format(s)

Mechanism of Water Oxidation by Ferrate(VI) at pH 7–9. / Chen, Gui; Lam, William W. Y.; Lo, Po-Kam; Man, Wai-Lun; Chen, Lingjing; Lau, Kai-Chung; Lau, Tai-Chu.

In: Chemistry - A European Journal, Vol. 24, No. 70, 12.12.2018, p. 18735-18742.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review