P21 矩形波ボルタンメトリーによる超音波反応場で生成したヒドロラジカルの迅速定量(ポスターセッション)

概要

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An electrochemical method for cavitation diagnostics is described for study of the hydroxyl radical production by ultrasonic cavitation. Salicylic acid (SA), was used as a chemical probe in this study. The results from liquid chromatography experiment indicate that SA was hydroxylated by hydroxyl radicals in ultrasonic reaction fields, producing two isomers, 2,3- and 2,5-dihydroxbenzonic acid (DHBA). At pH 2.0, 2,3- and 2,5-DHBA can be determined simultaneously by square wave voltammetry at a glassy carbon electrode, and the formation of 2,3- and 2,5-DHBA were found to be increased with increase in the irradiation time, which indicates the progress of OH radicals. The OH production rates are investigated in the sonochemical reactors with different frequencies and the sonochemical efficiencies were compared with the results Weissler reaction based on potassium iodide oxidation. A relationship between the apparent degradation rate constant and the sonochemical efficiency value (SE value) was also found. Based on these results, a simple model for estimating the apparent degradation rate constant of methylene blue based on the ultrasonic power and the SE value is proposed in this study.
2013-10-25