7 水溶液中におけるアゾ色素の超音波分解 : キャビテーション反応場の速度論

概要

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Cavitation derived from ultrasonic irradiation of a liquid is recently defined as an unusual and unique reaction site, attributing to a transient and small cavitation bubbles with extremely high temperature and high pressure. Reaction-pathways proceeded by the cavitation are, therefore, often different from those of the conventional thermal- and photochemical reactions. During the last decade, the application of the cavitation to an environmental preservation is one of the most important subjects. In the present study, we have performed the sonochemical decolorization and decomposition of low concentrations of azo dyes, such as C. I. Reactive Red 22 and methyl orange. It was confirmed that the color of dye solution smoothly faded by the irradiation, particularly at the experiment of lower initial concentration of dye. The rates of decomposition were also dependent on the irradiated atmosphere and pH of the solutions. A new kinetics model for the sonochemical decomposition of azo dye is proposed on the basis of a heterogeneous reaction model taking into account the local high concentration of OH radicals at the interface of cavitation bubbles.
日本ソノケミストリー学会の論文