UV-induced decomposition of ozone and hydrogen peroxide in the aqueous phase at pH 2-7

Gyula Wittmann, István Horváth, András Dombi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The photolysis of ozone and formation of hydrogen peroxide were investigated in solution of pH 2-7, in a 200 cm3 photoreactor in the incident photon flow range 9.6 × 10-8 - 4.2 × 10-7 einstein s-1. The quantum yield of the primary photochemical reactions was measured in a direct way by suppressing the secondary radical reactions. The determined quantum yields of the photo-decompositions of ozone and hydrogen peroxide were 0.42 ± 0.04 and 0.49 ± 0.04, respectively. A correct mathematical treatment is given for calculation of the light absorption of the individual components of a multi-absorbent reaction mixture. On the basis of the literature data and the present results, a probable chemical and reaction kinetic model was proposed to characterize the investigated reaction systems. Reaction kinetic simulations demonstrated that the model predicts a good fit to the measured data with the preferred literature rate constants, except that for the HO3 radical decomposition reaction. A reasonable reduction of this rate coefficient value is in accordance with the latest published results.

Original languageEnglish
Pages (from-to)281-291
Number of pages11
JournalOzone: Science and Engineering
Volume24
Issue number4
DOIs
Publication statusPublished - Jan 1 2002

    Fingerprint

Keywords

  • Hydrogen Peroxide
  • Ozone
  • Quantum Yield
  • Reaction Kinetic Simulation
  • UV Photolysis

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry

Cite this