波长254nm和365nm紫外辐照下活性艳红X-3B的光催化降解动力学研究  

Kinetic Study on the Photo-catalytic Degradation of Reactive Brilliant X-3B by UVC and UVA

作　　者：杨俊[1,2] 张平[1] 刘恋[1] 曾庆福[1] 

机构地区：[1]武汉纺织大学纺织印染清洁生产教育部工程研究中心,武汉430073 [2]南京大学生命科学学院,南京210093

出　　处：《环境科学》2011年第11期3365-3371,共7页Environmental Science

基　　金：国家自然科学基金项目(50978208);国家高技术研究发展计划(863)项目(2009AA063904);湖北省教育厅优秀中青年人才项目(Q20111608)

摘　　要：以活性艳红X-3B为对象,研究其在不同波段紫外光照射条件下的光催化降解动力学.结果表明,在长波紫外条件下,活性艳红X-3B的降解动力学符合表观一级动力学方程,其反应表观速率常数与光强之间呈对数关系;在短波紫外条件下,活性艳红X-3B的降解动力学可以用二级动力学方程拟合,速率常数与光强之间成正比.通过对比X-3B在2种光源下的降解半衰期发现,在同比条件下,365 nm光源对活性艳红X-3B的降解半衰期为37.263 min,而254 nm光源则下降为0.855 min.短波紫外比长波紫外具有更高的光量子效率,其对X-3B的降解效率也更高.Different wavelengths of UV light source were studied for the degradation of reactive brilliant red X-3B to reveal the function of wavelengths in photo-catalytic oxidation.The results showed that there were simultaneous photo-oxidation and photo-catalytic oxidation reactions for reactive brilliant red X-3B under ultraviolet light irradiation（254 nm）,while under ultraviolet light irradiation（365 nm）,there were only photo-catalytic reactions.The degradation of X-3B followed apparent first-order kinetics under 365 nm ultraviolet light irradiation,it also could be depicted by formulation of L-H model more precisely,while under 254 nm ultraviolet light irradiation,it followed apparent second-order kinetics.Compared with the degradation half-life of 365 nm light,the degradation half-life of brilliant red X-3B in 254 nm light decreased from 37.263 min to 0.855 min,indicating that the light quantum efficiency of short-wave UV was higher than that of the long-wave UV.

关 键 词：波长 活性艳红X-3B 光催化氧化 动力学 

分 类 号：X703.1[环境科学与工程—环境工程]