Sonolysis of 2,4-Dichlorophenoxyactive Acid in Aqueous Solutions. Evidence for ~·OH-Radical-Mediated Degradation

Julie Peller; Olaf Wiest; Prashant V.Kamat

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Sonolysis of 2,4-Dichlorophenoxyactive Acid in Aqueous Solutions. Evidence for ~·OH-Radical-Mediated Degradation

机译：2,4-二氯苯氧基活性酸在水溶液中的声解。〜·OH-自由基介导降解的证据

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2,4-dichlorophenoxyacetic acid (Z;4-D) undergoes eff;cientdegradation when an 02- or Ar-saturated aqueous solution is subjected to high-frequency (640 kHz) sonolysis. 2,4-dichlorophenol, hydroquinone, and catechol, are major reaction intermediates common to various experimental conditions. The similarities between the reaction intermediates ofsonolytic and radiolytic reactions indicate .OH radical as the primary reactive species responsible for 2,4-D degradation. Very little 2,4-D degradation occurs if the sonolysis is carried out in the presence of the .OH radical scavenger tert-butyl alcohol, also indicating that little or no pyrolysis of the compound occurs. Most of the 2,4-D eventually forms oxalic acid, which, unlike other .0H-mediated oxidation methods, is not easily mineralized with high-frequency ultrasound.

机译：当对02或Ar饱和的水溶液进行高频（640 kHz）声解时，2,4-二氯苯氧基乙酸（Z; 4-D）发生有效降解。 2,4-二氯苯酚，对苯二酚和邻苯二酚是各种实验条件下常见的主要反应中间体。声分解反应和辐射分解反应的反应中间体之间的相似性表明，.OH自由基是负责2,4-D降解的主要反应物种。如果在.OH自由基清除剂叔丁醇的存在下进行声解，则几乎不会发生2,4-D降解，这也表明该化合物几乎不发生热解。大多数2,4-D最终形成草酸，与其他.0H介导的氧化方法不同，草酸不易被高频超声矿化。

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2001年第13期|共6页
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Julie Peller; Olaf Wiest; Prashant V.Kamat;
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中图分类物理化学（理论化学）、化学物理学;
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1. Sonolysis of 2,4-Dichlorophenoxyactive Acid in Aqueous Solutions. Evidence for ~·OH-Radical-Mediated Degradation [J] . Julie Peller, Olaf Wiest, Prashant V.Kamat The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory . 2001,第13期

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8. Kinetics and Mechanisms of the Oxidative Degradation of Nitrilotriacetic Acid (NTA) in Aqueous Solutions. [R] . hanna, samir b. 1976

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Sonolysis of 2,4-Dichlorophenoxyactive Acid in Aqueous Solutions. Evidence for ~·OH-Radical-Mediated Degradation

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