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Mechanism and Kinetics of Parathion Degradation Under Ultrasonic Irradiation by Juan-Juan Yao; Nai-Yun Gao; Cong Li; Lei Li; Bin Xu is a Environmental Science article available to read on EtoBox.

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The parathion degradation under ultrasonic irradiation in aqueous solution was investigated. The results indicate that at the conditions in question, degradation rate of parathion decreased with increasing initial concentration and decreasing power. The optimal frequency for parathion degradation was 600 kHz. The free radical reactions predominate in the sonochemical degradation of parathion and the reaction zones are predominately at the bubble interface and, to a much lesser extent, in bulk solution. The gas/liquid interfacial regions are the real effective reaction sites for sonochemical degradation of parathion. The reaction can be well described as a gas/liquid heterogeneous reaction which obeys a kinetic model based on Langmuir-Hinshelwood model. The main pathways of parathion degradation by ultrasonic irradiation were also proposed by qualitative and quantitative analysis of organic and inorganic byproducts. It is indicated that the N 2 in air takes part in the parathion degradation through the formation of • NO 2 under ultrasonic irradiation. Parathion is decomposed into paraoxon and 4-nitrophenol in the first step via two different pathways, respectively, which is in agree

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Author

Juan-Juan Yao; Nai-Yun Gao; Cong Li; Lei Li; Bin Xu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3894)

Published

2010

Language

EN

Field

Environmental Science (Physical Sciences)