Photocatalyst Cd2Sb2O6.8 with High Photocatalytic Activity toward Benzene and Dyes

A nanocrystalline Cd2Sb2O6.8 photocatalyst was synthesized from Cd(Ac)(2) and K2H2Sb2O7 via it facile hydrothermal method for the first time. The obtained sample was characterized by X-ray diffraction, N-2 sorption-desorption, UV-vis diffuse reflectance spectroscopy, transmission electron microscopy, electron spin resonance, X-ray photoelectron spectroscopy, and Fourier transformation infrared spectroscopy. The photocatalytic activity of the sample was evaluated by the degradation of benzene in an O-2 gas stream and dyes in aqueous solution under ultraviolet (UV) light illumination. The results demonstrated that Cd2Sb2O6.8 had exhibited a higher photocatalytic activity than that of P25 (Degussa Co.) in the degradation of benzene. For it longtime (40 h) reaction test, Cd2Sb2O6.8 maintained a high activity, and no obvious deactivation was observed. In the liquid phase, degradation of methyl orange; salicylic acid; and Rhodamine B. Cd2Sb2O6.8, also exhibited high photoactivity. A possible mechanism of the photocatalysis Over Cd2Sb2O6.8 proposed.