[Sonocatalytic degradation of ethyl violet in the presence of high dispersion TiO2 and the comparison of catalytic activity with suspension TiO2].

Ethyl violet was chose as a model compound in this paper. The ultrasound of 50 W power and 40 kHz frequency was used as an irradiation source to induce TiO2 particles. We have compared sonocatalytic degradation ratios in the presence of dispersion TiO2 and suspension TiO2 sonocatalysts. It was found that the degradation effect in the presence of dispersion TiO2 was much higher than that in the presence of suspension TiO2. The degradation ratios of ethyl violet in the presence of dispersion TiO2 attains 78.45%, while the degradation ratios of ethyl violet in the presence of suspension TiO2 with onefold ultrasonic irradiation are only 27.12% and 10%, respectively. In addition, a variety of affecting factors including irradiation time of ultrasound, adding amount of TiO2 catalyst, initial concentration of ethyl violet, ultrasonic power and temperature on sonocatalytic degradation of ethyl violet were also reviewed, as well as the possible degradation mechanism was also discussed. The experimental results indicate that the sonocatalytic degradation method in the presence of dispersion TiO2 catalyst is an advisable choice for the treatments of non- or low-transparent organic wastewaters in future.