A commercially pure titanium sheet with titanium
carbide (TiC) precipitated in its surface layer was anodized in NH4NO3 aqueous solution and heat treated in air. The photocatalytic activity of titanium
dioxide powder collected from the surface of the anodized titanium sheet was
evaluated under ultra-violet and visible light irradiation. It showed
relatively high photocatalytic activity in 0.1 mol/l potassium iodide solution, which was almost equal to the activity
level of TiO2 powder (P-25) manufactured by Degussa Corporation. The
better photocatalytic activity under ultra-violet irradiation is considered to
be related to the formation of anatase type titanium dioxide. Photocatalytic
activity under visible light irradiation was also observed, which was considered to be attributable to impurity doping, (carbon), in the
titanium dioxide powder.
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