Abstract
Photocatalyst powders were synthesized from nanosized titanium dioxide crystals modified by sintering with thiourea (TU). The powders contained anatase crystals of various sizes. TU-TiO2 powders absorbed visible light to produce an oxidizer (oxidizing iodide) and a reducing agent (reducing tetranitromethane). The activity of TU-TiO2 correlated with the size of nanocrystals. The photocatalytic activity of TU-TiO2 was suggested to be related to impurity states appearing during modification in the forbidden band of TiO2.
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