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- W2157861723 abstract "Ta/TiO 2 - and Nb/TiO 2 -mixed oxides photocatalysts were prepared by simple impregnation method at different TiO 2 : Nb or Ta mass ratios of 1 : 0.1, 1 : 0.5, and 1 : 1, followed by calcination at 500 ∘ C. The prepared powders have been characterized by XRD, XPS, UV-Vis spectra, and SEM. The photocatalytic activity was evaluated under natural solar light for decolorization and mineralization of azo dye Orange II solution. The results showed that Nb/TiO 2 - and Ta/TiO 2 -mixed oxides have higher activity than the untreated TiO 2 under natural solar light. The maximum activity was observed for Nb/TiO 2 sample (at mass ratio of 1 : 0.1), which is characterized by the smallest crystalline size (17.79 nm). Comparing with the untreated TiO 2 , the solar decolorization and mineralization rates improved by about 140% and 237%, respectively, and the band gap reduced to 2.80 eV. The results suggest that the crystal lattices of TiO 2 powder are locally distorted by incorporating Nb 5+ species into TiO 2 , forming a new band energy structure, which is responsible for the absorption in the visible region. Unlike Ta/TiO 2 , the Nb/TiO 2 -mixed oxides can prevent the grain size growth of the treated TiO 2 , which is important to achieve high solar photoactivity." @default.
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- W2157861723 date "2012-01-01" @default.
- W2157861723 modified "2023-09-22" @default.
- W2157861723 title "Ta/Ti-and Nb/Ti-Mixed Oxides as Efficient Solar Photocatalysts: Preparation, Characterization, and Photocatalytic Activity" @default.
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- W2157861723 doi "https://doi.org/10.1155/2012/548158" @default.
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