The photochemical evolution of hydrogen from aqueous solutions of ferrous ions. Part I. The reaction mechanism at low pH

Joshua Jortner*, Gabriel Stein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The photochemical oxidation of ferrous ion in 0.8 N H2SO4 was investigated in the absence and presence of O2. The yields of H2 and Fe3+ were determined and the dependence of the quantum yield on light intensity, Fe2+ and Fe3+ concentration, and on the concentration of O2 was investigated. The post-irradiation effect due to H2O2 formation was followed. The inner filter effect due to the ferric ions formed in the reaction was taken into account. As a result, a mechanism accounting for the experimental facts could be derived. The excited state resulting on light absorption yields H atoms. H atoms oxidize ferrous ions in acid solution and also react with O2, if present. The competition between O2 and Fe2+ for the H atoms formed was investigated. It appears that the direct effect of O2 on the excited state is relatively small.

Original languageEnglish
Pages (from-to)1258-1264
Number of pages7
JournalJournal of Physical Chemistry
Volume66
Issue number7
DOIs
StatePublished - 1962
Externally publishedYes

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