| 波长254 nm和365 nm紫外辐照下活性艳红X-3B的光催化降解动力学研究 |
| 摘要点击 2437 全文点击 2032 投稿时间：2010-12-17 修订日期：2011-05-06 |
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| 中文关键词 波长 活性艳红X-3B 光催化氧化 动力学 |
| 英文关键词 wavelength reactive brilliant red X-3B photo-catalytic oxidation kinetic |
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| 中文摘要 |
| 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. |
| 英文摘要 |
| 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. |
