[Kinetic study on the photo-catalytic degradation of reactive brilliant X-3B by UVC and UVA].

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.