Preparation of Cr-Doped Tio2 Thin Film By Sonochemical/Cvd Method and Its Visible Light Photocatalytic Activity For Degradation of Paraoxon Pesticide

In this work, nanostructured tio2 and cr-doped tio2 thin films were deposited on glass substrate through sonochemical-chemical vapor deposition method. the resulting thin films were characterized by x-ray diffraction, scanning electron microscopy (sem), uv-visible absorption spectroscopy, and photoluminescence spectroscopy techniques. the tio2 thin film has nanocubic morphology and the cr-doped tio2 thin film contains nanostructures with irregular shapes in its structures in which these nanostructures themselves are composed of nanorods. doping the tio2 by cr resulted in a decrease in the band gap energy of tio2 and also in the reduction of photogenerated electron-hole recombination rate. the visible light photocatalytic activity of the prepared thin films was also investigated for degradation of paraoxon pesticide. according to the obtained results, the cr-doped tio2 thin film has higher photocatalytic activity than undoped tio2 thin film. moreover, reusability test results revealed that the cr-doped tio2 thin film has higher stability than undoped tio2 thin film.