A kinetic study of enhancing effect by phenolic compounds on the hydroxyl radical generation during ozonation

Y. H. Han, K. Ichikawa, H. Utsumi

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10 Citations (Scopus)

Abstract

Ozone decomposition in aqueous solution proceeds through a radical type chain mechanism. These reactions involve the very reactive and catalytic intermediates O2- radical, OH radical, HO2 radical, OH-, H2O2, etc. OH radical is proposed as an important factor in the ozonation of water among them. In the present study, the enhancing effects of several phenolic compounds; phenol, 2-, 3-, 4-monochloro, 2,4-dichloro, 2,4,6-trichlorophenol on OH radical generation were mathematically evaluated using the electron spin resonance (ESR)/spin-trapping technique. OH radical was trapped with a 5,5-dimethyl-1 -pyrroline-N-oxide (DMPO) as a stable adduct, DMPO-OH. The initial velocities of DMPO-OH generation in ozonated water containing phenolic compounds were quantitatively measured using a combined system of ESR spectroscopy with stopped-flow apparatus, which was controlled by homemade software. The initial velocities of DMPO-OH generation increased as a function of the ozone concentration. The relation among ozone concentration, amount of phenolic compounds and the initial velocity (ν0) of DMPO-OH generation was mathematically analyzed and the following equation was obtained, ν 0 (10-6 M/s) = (A′ × [PhOHs (10-9 M)] + 0.0005) exp (60 × [ozone (10-9 M)]). The equation fitted very well with the experimental results, and the correlation coefficient was larger than 0.98.

Original languageEnglish
Pages (from-to)97-102
Number of pages6
JournalWater Science and Technology
Volume50
Issue number8
DOIs
Publication statusPublished - 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology

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