photocatalytic activity of co-doped tio2 nanoparticles under uv and visible light

M/tio2 (m=ag,cr,cu,v,pt) was synthesized by standard sol-gel methods. the resulting materials were extensivelly characterized by means of x-ray diffraction (xrd), bet surface-area measurements, raman spectroscopy, and uv-vis spectroscopy and transmission electron microscopy (tem). uv-vis spectroscopy demonstrated a clear shift in the absorbance of the catalysts towards the visible light region. the photocatalytic activity of m/tio2 was evaluated in the oxidation of methylcyclohexane (mch) under the illumination of uv and visible light. the conducted reactions were monitored by in situ atr-ftir technique. the photocatalytic acivity of cr/tio2 showed much better conversion of mch under visible light illumination compared with the parent of other m/tio2.