A simple method to synthesise Ag-doped TiO 2 photocatalysts with different Ag 0 :Ag 2 O atomic ratios for enhancing visible-light photocatalytic activity

Pure anatase TiO 2 photocatalysts with different Ag contents were prepared via a simple sol-gel method. The as-prepared anatase Ag-doped TiO 2 photocatalysts were characterised by X-ray diffraction, transmission electron microscopy, UV-Vis diffuse reflectance spectra, photoluminescence spectroscopy,...

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Bibliographic Details
Published in:Journal of chemical research 2017-08, Vol.41 (8), p.475-483
Main Authors: Chen, C., Lei, X. F., Xue, M. Z.
Format: Article
Language:English
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Summary:Pure anatase TiO 2 photocatalysts with different Ag contents were prepared via a simple sol-gel method. The as-prepared anatase Ag-doped TiO 2 photocatalysts were characterised by X-ray diffraction, transmission electron microscopy, UV-Vis diffuse reflectance spectra, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, thermal gravity and differential thermal analysis, scanning electron microscopy and N 2 adsorption–desorption measurements (BET). Compared with pure TiO 2 , Ag-doped anatase TiO 2 photocatalysts exhibited not only increases in light absorption in the visible region, the separation efficiency of electron–hole pairs and surface area, but also inhibition of the titania phase transition from anatase to rutile. Photoreduction results showed that Ag-doped anatase TiO 2 photocatalysts have greatly improved photocatalytic activity, compared with pure TiO 2 , and the reduction of Cr(VI) under visible light irradiation was much higher than that of pure TiO 2 . The optimum Ag content was 1.0 mol%, which led to the complete reduction of Cr(VI) under visible light irradiation (λ > 420 nm) for 4 h. The enhanced photocatalytic activity was attributed to the synergic effect of the pure anatase structure, and the increased light absorption in the visible region, separation efficiency of electron–hole pairs and atomic ratio of Ag 0 :Ag 2 O.
ISSN:1747-5198
2047-6507
DOI:10.3184/174751917X15012350965047