Abstract
The photocatalytic characteristics of partially reduced TiO2 (TiO2−x ) by plasma treatment and plasma-heated treatment were investigated in the visible-light region. For the visible-light photocatalytic activity of TiO2−x , plasmaheated treatment shows stronger than plasma treatment significantly. The TiO2−x by plasma-heated treatment shows broader red-shifted absorption bands than one by plasma treatment in the visible-light region. The surface color of TiO2−x by plasma treatment and plasma-heated treatment changed from white to sky blue, and to navy, respectively. After exposure to air, the surface color of TiO2−x changed from sky blue to white for plasma treatment and from navy to beige for plasma-heated treatment.
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