The photocatalytic activity of strontium titanate (SrTiO 3 ) perovskite films has been examined and compared with that of commercially available titania (TiO 2, Degussa P25) in the degradation of a model pollutant, Victoria Blue dye. The effects of pH, synthesis temperature, and Sr/Ti ratio in the synthesis of the perovskite were examined. SrTiO 3 was prepared using Ag, Pt, or Au and characterized using optical and surface analysis methods. We found no clear evidence of substitution of the noble metal into the SrTiO 3 lattice, and most metal existed as zerovalent metal deposits. Addition of Ag to SrTiO 3 showed the most promising catalytic activity toward dye degradation. Degradation of the dye under UV−visible light was also observed to be enhanced only for Ag−SrTiO 3 .
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Subramanian et al. (2006) studied this question.
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