23. 超音波照射による水中フタル酸ジエチルの分解

概要

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The decomposition of phthalic acid esters (PAEs), such as dimethyl phthalate (DMP), diethyl phthalate (DEP) and dibutyl phthalate (DBP) in water by ultrasonic irradiation is performed at an ultrasonic frequency of 200 kHz (intensity: 6 Wcm^<-2>). The decomposition of PAEs follows first-order kinetics and the rate of decomposition follows the order DEP > DBP > DMP. The rate of decomposition of DEP and rate of formation of hydrogen peroxide in pure water by ultrasonic irradiation depend upon the nature of dissolved gas. The reaction with hydroxyl radicals is found to be a preferential factor of the degradation of DEP in the pH 4 to 11 region. The rate of decomposition via hydrolysis increases with increasing pH in the pH over 11. The decomposition via thermal reaction did not appear to be affected by the change of pH. The rate for degradation of DEP in the presence of ultrasound is about 50 and 6 times higher than that in the absence of ultrasound (stirring) at pH 11, 12.5, respectively. From these results, the enhanced decomposition of DEP in the presence of ultrasound can be suggested and this may be due to effective temperature in the region between cavitation bubble and bulk solution.
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