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Transition metal (vanadium, chromium, iron) doped TiO2 was synthesised by co-precipitation or by surface-deposition. The specimens were characterised by XRD and reflectance spectroscopy. In terms of the structure, the surface doped samples are same as those made by co-precipitation nor did the presence of metal ions change the structure. The presence of transition metal induced a shift of light absorption of the doped TiO2 to visible wavelengths. The introduction of transition metal ions into TiO2 significantly affected the photoactivity, which was determined by the oxidation of IPA and photogreying. As a general trend, an optimum dopant appeared which gave the maximum photoactivity. It was found that the photoactivity of co-precipitated samples was lower than that of surface-doped. The photoactivity of doped TiO2 is a function of many parameters, such as the dopant content, energy level of dopant, the d electronic configuration of dopant ions and the distribution of dopant. These factors influence IPA photo-oxidation and photogreying to different extents.</p

The Effect of Transition Metal on the Optical Properties and Photoactivity of Nano-particulate Titanium Dioxide