Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28787
Title: Modeling the ozonation of 2,4-dichlorophoxyacetic acid through a kinetic approach
Authors: Chu, W 
Ching, MH
Keywords: 2,4-D
Herbicide
Kinetics
Modeling
Ozone
Issue Date: 2003
Publisher: IWA Publishing
Source: Water research, 2003, v. 37, no. 1, p. 39-46 How to cite?
Journal: Water research 
Abstract: The ozonation of herbicide 2,4-dichlorophoxyacetic acid (2,4-D) was studied and modeled at different initial pH levels and initial concentrations. The degradation rate of 2,4-D was found to increase with the initial pH level and decrease with initial 2,4-D concentration. A two-stage ozonation of 2,4-D was observed, in which the initial stage of ozonation was slightly faster than the second stage due to the higher initial (saturated) ozone concentration; under these circumstances, the direct molecular ozone oxidation was likely to predominate. At the second stage, the indirect radical oxidation became more significant in determining the overall 2,4-D oxidation, and the reaction was more pH-dependent. A mathematic model associated with the analytical solutions consisting of direct and indirect oxidations contributed by the molecular ozone and free radical is proposed. The proposed model is capable of predicting the decay of 2,4-D quantitatively by ozonation at different initial pH levels and initial 2,4-D concentrations.
URI: http://hdl.handle.net/10397/28787
ISSN: 0043-1354
EISSN: 1879-2448
DOI: 10.1016/S0043-1354(02)00250-6
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