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Comparison of Threshold Power between Methylene Blue Degradation and KI Oxidation Reaction Using Ultrasound

Open Journal of Acoustics 2018年第4期8卷 61-69页

作者： Daisuke Kobayashi Chiemi Honma Hideyuki Matsumoto katsuto otake Atsushi Shono Department of Applied Chemistry Tokyo Denki University Tokyo Japan Department of Industrial Chemistry Faculty of Engineering Tokyo University of Science Tokyo Japan Renewable Energy Research Center Department of Energy and Environment Advanced Industrial Science and Technology Koriyama Japan Department of Chemical Science and Engineering Tokyo Institute of Technology Tokyo Japan

Ultrasound is used in various chemical reaction processes, and these reactions are influenced by ultrasonic frequency. A threshold power is required for the ultrasonic degradation reaction and oxidation reaction caused by hydroxyl radicals, and the cavitation threshold power is also influenced by frequency generally. In this study, the effects of frequency on the threshold power of methylene blue degradation and KI oxidation were investigated in the range between 22.8 kHz and 1640 kHz. The threshold power of KI oxidation reaction increased with increasing frequency. This phenomenon well agrees with previous study, and it is revealed that the generation of I-3?ion is caused by oxidation reaction of Iˉ ions with hydroxyl radicals. On the other hand, the threshold power of methylene blue degradation reaction was not affected by frequency. The ultrasonic degradation of methylene blue is considered to be caused by hydroxyl radicals, and there is a linear relationship between degradation rate constant and sonochemical efficiency value. However, it is guessed that the degradation of methylene blue is occurred inside cavitation bubble by pyrolysis at high frequency regions.

关键词： Degradation Methylene Blue Degradation KI Oxidation Frequency Threshold Power

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Effect of Particle Addition on Ultrasonic Degradation Reaction Rate

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Open Journal of Acoustics 2015年第3期5卷 67-72页

作者： Daisuke Kobayashi Kaho Shimakage Chiemi Honma Hideyuki Matsumoto katsuto otake Atsushi Shono Department of Green and Sustainable Chemistry Tokyo Denki University Tokyo Japan Department of Industrial Chemistry Faculty of Engineering Tokyo University of Science Tokyo Japan Renewable Energy Research Center Department of Energy and Environment Advanced Industrial Science and Technology Fukushima Japan

The ultrasonic degradation of methylene blue at a frequency of 490 kHz was carried out in the absence and presence of TiO2 or Al2O3 particle, and the effects of amounts of particle on the enhancement of degradation rate constant estimated by assuming first-order-kinetics were investigated. The degradation reaction was enhanced by particle addition, and the apparent degradation rate constant is proportional to the increase in amount of particle. In addition, the constant of proportionality is not influenced by degraded material and ultrasonic frequency. However, particle type influences the constant of proportionality, and the value of TiO2 particle is about 6 times as large as that of Al2O3 particle.

关键词： Degradation Methylene Blue Frequency Particle Addition

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