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KMID : 1024520000090020151
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Journal of the Environmental Sciences
2000 Volume.9 No. 2 p.151 ~ p.158
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The study for photodegradation of diazinon using TiO₂ photocatalyst
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Ryu Seong-Pil
Oh Youn-Keun
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Abstract
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Considerable interest has been shown in recent years towards utilizing particles as a photocatalyst in the degradation of harmful organic contaminants. In this study, photocatalytic degradation of diazinon which is extensively used as a pesticide in the agriculture field, has been investigated with UV-illuminated weight, UV wavelength, pH of the solution. Photodegradation rate increased with decreasing initial concentration of diazinon and with increasing pH of the solution. Photodegradation rate increased with increasing weight, but was nearly the same at weight of 1g/, 2 g/, i.e., for initial diazinon concentratin of 5 mg/. UV wavelength affecting on the degradation rate of diazinon decreased in the order of 254 nm>312 nm> 365 nm. For weight of 1 g/and initial diazinon concentration of 5 mg/, the photodegradation removal of diazinon was 100% after 130 min in the case of 254 nm, but 95% in the case of 312 nm, and 84% in the case of 365nm, after 180 min. The photodegradation of diazinon followed a first order or a pseudo - first order reaction rate. For initial diazinon concentration of 5 mg/, the rate constants(k) in UV and (1 g/)/UV system were at 365 nm respectively
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KEYWORD
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TiO2/UV, AOPs, diazinon, band gap energy, electron, positive hole, OH radical
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