Observations of 2,4,6-trichlorophenol degradation by ozone

Nigel Graham, Wei Chu, Catherine Lau

Research output: Journal article publicationJournal articleAcademic researchpeer-review

49 Citations (Scopus)

Abstract

The aqueous reactivity of 2,4,6-trichlorophenol (TCP) with ozone has been studied at laboratory-scale using a simple gas bubble/liquid contacting system. Degradation rate constants were measured directly and found to be 7.6 and 77.2 M-1s-1at pH 2 and 7.5, respectively. At pH 7.5, 10 min of ozonation (≡ 15 mM ozone consumption) achieved a 90% degradation of TCP, which corresponded to the release of approximately 2 mol Cl-per mol TCP. The presence of hydrogen peroxide in solution did not significantly increase the TCP degradation but increased the overall dechlorination to 2.7 mol Cl-per mol TCP. The presence of humic acid (HA) in solution was found to enhance the degradation rate of TCP at low relative HA concentrations (<0.6 g/g HA:TCP), but to reduce the rate at higher HA concentrations.
Original languageEnglish
Pages (from-to)237-243
Number of pages7
JournalChemosphere
Volume51
Issue number4
DOIs
Publication statusPublished - 1 Jan 2003

Keywords

  • Dechlorination
  • Humic acid
  • Hydrogen peroxide
  • Ozone
  • Trichlorophenol

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)

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