Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/9486
Title: Degradation of atrazine by manganese-catalysed ozonation- influence of radical scavengers
Authors: Ma, J
Graham, NJD
Keywords: Atrazine
Ozone
Catalytic oxidation
Manganese
Advanced oxidation
Hydroxyl radical scavengers
Issue Date: 2000
Publisher: IWA Publishing
Source: Water research, 2000, v. 34, no. 15, p. 3822-3828 How to cite?
Journal: Water research 
Abstract: The effect of radical scavengers such as bicarbonate and tert-butanol on the MnII catalysed ozonation of atrazine, an important herbicide and well-established radical probe substance, was studied using a conventional gas bubble-contacting column. It was found that the presence of a small amount of MnII (0.3–1.2 mg/l) greatly increased the degradation rate of atrazine, with the formation of by-product compounds of a lower molecular weight and a greater polarity (as indicated by shorter retention times in HPLC chromatography). However, the presence of either bicarbonate or tert-butanol had a negative effect on the degradation of atrazine. With an increase of bicarbonate concentration, the oxidation rate of atrazine by MnII-catalysed ozone was substantially reduced and a correspondingly higher residual ozone was observed. In the presence of tert-butanol, greater reductions of the degradation rate of atrazine were observed and the decomposition of ozone was greatly retarded, resulting in a higher residual ozone; this was the case for either ozone oxidation alone or MnII-catalysed ozone oxidation. These results appear to confirm that the degradation of atrazine by ozone in the presence of MnII follows a radical mechanism. It is believed that MnII catalyses the decomposition of ozone through the formation of intermediate manganese species (such as MnIV), leading to the generation of hydroxyl radicals.
URI: http://hdl.handle.net/10397/9486
ISSN: 0043-1354
EISSN: 1879-2448
DOI: 10.1016/S0043-1354(00)00130-5
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