16. 不均一水溶液系における揮発性有機塩素化合物の超音波分解

概要

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Water pollution by volatile chlorinated organic compounds, such as trichloroethylene, tetrachloroethylene, carbon tetrachloride, etc. has been becoming a serious problem in our society. In this study, these compounds were decomposed by high and low power ultrasonic irradiation with frequency of 28, 45, 100 and 200kHz. To achieve an effective decomposition rate with a low energy, we have investigated for the sonochemical decomposition in the presence of transition metal powders. In the heterogeneous aqueous solution, the pronounced cavitation effects were found to be observed under low power and low frequency ultrasonic irradiation. On the other hand, it was suggested that the reductive dechlorination of carbon tetrachloride occurred in the presence of transition metal powders and the rates were in the order of Zn > Fe > Cu. The rates of decomposition were accelerated by the addition of metal powders in all cases, however, the rates of decomposition of trichloroethylene and tetrachloroethylene were considerably slower than that of carbon tetrachloride.
日本ソノケミストリー学会の論文