[Photocatalytic degradation of reactive red X-3B by immobilized P25 in a contact oxidation reactor].

The immobilized photocatalyst, P25 supported by glass fiber, was prepared by calcining method. The effect of calcining temperature on the photocatalytic activity and the effect of initial pH and inorganic anions on the photocatalytic degradation of Reactive Red X-3B were explored in a new photocatalytic contact oxidation reactor. The results show that catalyst activity is affected drastically by calcining temperature, the optimal temperature is 300 degrees C; the SEM photos of immobilized catalyst indicated that P25 adhered to glass fiber firmly; The Reactive Red X-3B was more easily degraded in acid solution, when initial pH increasing from 2.0 to 10.0, the degradation rate of Reactive Red X-3B decreased from 90.06% to 42.71%; inorganic anions, CO3(2-) and SO4(2-), had little effect on the degradation of Reactive Red X-3B. However, the degradation of Reactive Red X-3B significantly decreased, 17.03% down, in the presence of Cl-. So it was a good alternate scenario to conduct photocatalytic oxidation by using immobilized P25 in a contact oxidation reactor.