波长与辐射强度对活性艳蓝KN-R光催化降解的影响

Effects of Wavelength and Radiation Intensity on Photocatalytic Degradation of Reactive Blue KN-R

以TiO2为光催化剂,分别测定了365nm和254nm两种紫外光源波长及辐射强度对活性艳蓝KN-R模拟废水处理效果的影响。实验结果表明:在波长365nm紫外光源照射2h后,活性艳蓝KN-R降解率达69.1%,活性艳蓝KN-R的降解可用二级反应速率方程拟合;在波长254nm紫外光源照射1h后,活性艳蓝KN-R降解率达93.9%,活性艳蓝KN-R的降解可用一级反应速率方程描述;在两种光源照射下,表观反应速率常数均随着辐射强度增加而增大。

Simulated reactive blue KN-R wastewater was treated using TiO2 as photocatalyst and two UV light sources with 365 nm and 254 nm of wavelength. The effects of wavelength and radiation intensity were studied. The experimental results show that： After radiation under 365 nm UV-light for 2 h, the degradation rate of reactive blue KN-R is 69.1%, and the degradation of reactive blue KN-R can fit the second order reaction rate equation; After radiation under 254 nm UV-light for 1 h, the degradation rate of reactive blue KN-R is 93.9%, and the degradation of reactive blue KN-R can fit the first order reaction rate equation; Under radiation with these two UV light sources, the apparent reaction rate constants are both increased with the increasing of radiation intensity.