Mechanism of the hydroxide ion initiated decomposition of ozone in aqueous solution

authored by: L. Forni, D. Bahnemann, Edwin J. Hart
Abstract: Stopped-flow experiments are reported on the OH -catalyzed chain decomposition of ozone in the pH range 11-13. O₃^-• has been identified as a product by its 430-nm absorption band. Acetate and carbonate ions inhibit this reaction. In the carbonate-inhibited reaction, the radical anion CO₃^-• has been identified by its 600-nm absorption band. In this case an apparent second-order rate constant of 115 ± 40 dm³ mol^-1 s^-1 has been obtained. Evidence is provided to support the reaction OH^- + O₃ → HO₂^- + O₂ as the primary step. On this basis, k(OH^- + O₃) equals 48 ± 12 dm³ mol^-1 s^-1. Some aspects of the overall reaction are discussed.
External Organisation(s): Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Brunel University
Type: Article
Journal: Journal of Physical Chemistry
Volume: 86
Pages: 255-259
No. of pages: 5
ISSN: 0022-3654
Publication date: 1982
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Engineering, Physical and Theoretical Chemistry
Electronic version(s): https://doi.org/10.1021/j100391a025 (Access: Unknown)