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 language | English |
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Pages (from-to) | 237-243 |
Number of pages | 7 |
Journal | Chemosphere |
Volume | 51 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Jan 2003 |
Keywords
- Dechlorination
- Humic acid
- Hydrogen peroxide
- Ozone
- Trichlorophenol
ASJC Scopus subject areas
- Environmental Chemistry
- General Chemistry