Abstract
Gamma ray-induced degradation of 2,4-dichlorophenol (DCP) in the presence of ozone has been investigated. The results show that ozone can remarkably increase the degradation rate of 2,4-DCP in aqueous solution. The degradation kinetics of 2,4-DCP can be described by the first-order reaction model, and the rate constant was 0.443, 0.490 and 1.247 h−1, respectively, for γ-ray irradiation only, γ-ray irradiation + 13 mg/L O3 and γ-ray irradiation + 30 mg/L O3. High-performance liquid chromatography analysis shows that the dechlorinated products are 4-chlorophenol, 2-chlorophenol and phenol; and the oxidation products are hydroquinone, benzoquinone, maleic, fumaric, acrylic, malonic, oxalic, acetic and formic acids. The possible pathways for 2,4-DCP degradation involving all these oxidation products are tentatively proposed. Combining γ-ray irradiation with ozonation is a promising technology for removing toxic pollutants from water and wastewater.
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