Effect of Particle Addition on Ultrasonic Degradation Reaction Rate

Abstract

The ultrasonic degradation of methylene blue at a frequency of 490 kHz was carried out in the absence and presence of TiO 2 or Al 2 O 3 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 TiO 2 particle is about 6 times as large as that of Al 2 O 3 particle.