The photochemical evolution of hydrogen from aqueous solutions of ferrous ions. Part II. Effect of changing pH

Joshua Jortner*, Gabriel Stein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The photochemistry of the ferrous ion in the presence and in the absence of oxygen was investigated in the pH region 0.35-3.0. The pH dependence of the initial quantum yield up to pH 2.5 in the presence and absence of oxygen is interpreted as arising from the dependence on H+ ion concentration of the rate of introduction of H atoms into the bulk. This results in the dependence of the quantum yield on √[H+]. A mechanism to account for this is proposed. Another pathway leading to the pH independent formation of H atom also is postulated. The oxidation and reduction processes of the H atoms thus formed are investigated and it is shown that the oxidation of Fe2+ by H atoms may proceed by way of a hydride intermediate. Specific velocity constants are derived. The results of the photochemical experiments are correlated with those obtained in radiation chemistry.

Original languageEnglish
Pages (from-to)1264-1271
Number of pages8
JournalJournal of Physical Chemistry
Volume66
Issue number7
DOIs
StatePublished - 1962
Externally publishedYes

Fingerprint

Dive into the research topics of 'The photochemical evolution of hydrogen from aqueous solutions of ferrous ions. Part II. Effect of changing pH'. Together they form a unique fingerprint.

Cite this