The photocatalytic activity of Fe3+ doped films were significantly
enhanced, where as the photocatalytic activity of Cr3+ doped
films were similar even lower than undoped those. The anatase
films doped from Fe(NO3)3·9H2O solution with a concentration
of 0.05% by photodepositing method for 24 h has the highest
photocatalytic activity for methyl orange under UV irradiation.