高度分散TiO2催化超声降解乙基紫及与悬浮TiO2催化活性的比较

采用输出功率为50 W,频率为40 kHz的超声波作为激发源激发TiO₂,比较了分散和悬浮2种不同形态TiO₂存在时超声降解乙基紫的情况.结果表明,在高度分散TiO₂存在的条件下,超声降解乙基紫的效果要远远好于悬浮TiO₂,超声照射40 min降解率达到78.45 %,而在悬浮TiO₂存在下降解率只有27.12 %,在单纯超声波作用下同样时间内降解率只有10%.另外还研究了不同因素包括：反应时间、初始浓度、催化剂加入量、超声功率和温度等对TiO₂催化超声降解乙基紫反应的影响,讨论了TiO₂催化超声降解乙基紫可能的反应机理.

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.