For a rhodium ion-modified TiO2(Rh3+/TiO2) photocatalyst responding to visible light, control of the structure of the Rh3+modifier and effects of the structures of the Rh3+modifier on photocatalytic activities were examined. A TiO2support was pre-calcined to maintain crystallinity and specific surface area during post-calcination, and the structure of the Rh3+modifier for Rh3+/TiO2was changed by post-calcination without causing changes in the crystallinity and specific surface area of the TiO2support. In mineralization of acetone under irradiation of visible light, the photocatalytic activities of the post-calcined Rh3+/TiO2showed a volcano-like tendency as a function of post-calcination temperature. The results of this study showed that an atomically isolated structure of the Rh3+modifier was preferable for high activities and that aggregation of the Rh species led to a decrease in the activities.
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