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

Joshua Jortner; Gabriel Stein

doi:10.1021/j100813a012

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

Hebrew University of Jerusalem

Research output: Contribution to journal › Article › peer-review

46 Scopus citations

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 language	English
Pages (from-to)	1258-1264
Number of pages	7
Journal	Journal of Physical Chemistry
Volume	66
Issue number	7
DOIs	https://doi.org/10.1021/j100813a012
State	Published - 1962
Externally published	Yes

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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.",

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year = "1962",

doi = "10.1021/j100813a012",

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T1 - The photochemical evolution of hydrogen from aqueous solutions of ferrous ions. Part I. The reaction mechanism at low pH

AU - Jortner, Joshua

AU - Stein, Gabriel

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N2 - 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.

AB - 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.

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

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