高度分散TiO_2催化超声降解乙基紫及与悬浮TiO_2催化活性的比较  

Sonocatalytic Degradation of Ethyl Violet in the Presence of High Dispersion TiO_2 and the Comparison of Catalytic Activity with Suspension TiO_2

作　　者：王君[1] 姜岳峰[1] 张朝红[2] 张向东[1] 马腾[1] 张冠[1] 赵刚[1] 张鹏[1] 

机构地区：[1]辽宁大学化学系,沈阳110036 [2]辽宁大学环境科学系,沈阳110036

出　　处：《环境科学》2007年第2期363-367,共5页Environmental Science

基　　金：国家自然科学基金项目(20371023);辽宁省教育厅自然科学基金项目(2004C018)

摘　　要：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.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 senocatalytic 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.

关 键 词：超声降解 二氧化铁(TiO2) 高度分散 乙基紫 

分 类 号：X703.1[环境科学与工程—环境工程]