Synergistic effects of C-Cr codoping in TiO2 and enhanced sonocatalytic activity under ultrasonic irradiation.

C and Cr co-doped TiO(2) (C-Cr-TiO(2)) sonocatalyst were synthesized by doping TiO(2) with glucose and CrCl(3) in a sol-gel method. The samples were characterized by X-ray diffraction, transmission electron microscopy, ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy, and X-ray photoelectron emission spectroscopy (XPS). C and Cr were detected by XPS analysis. The influence of dopants on the properties and sonocatalytic activity of TiO(2) was studied. The sonodegradation products of methylene blue were analyzed by UV-vis absorption spectroscopy. The presence of C-Cr-TiO(2) catalysts substantially enhanced the sonocatalytic degradation of MB in aqueous suspensions. The possible sonocatalytic mechanisms were also discussed. Crown Copyright Â