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Lei, X.F.; Xue, X.X.; Yang, H.
Applied surface science, 12/2014, Volume: 321Journal Article
•Ag-doping in TiO2 can preserve the anatase form to higher temperature.•Ag-doped TiO2 samples can absorb both UV and visible light.•The band gap energy of the sample significantly reduced after Ag-doping.•Ag-doped TiO2 samples effective for visible light-induced reduction of Cr(VI). Ag-doped TiO2 nanomaterials (Ag–TiO2) were prepared by a sol–gel method. The structures of Ag–TiO2 nanomaterials were characterized by X-ray diffraction (XRD), UV–vis diffuse reflectance spectra (DRS), X-ray photoluminescence (PL) spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetry and differential thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), scanning electron microscopy (SEM) and nitrogen adsorption–desorption isotherms. The photocatalytic activities were checked through the photocatalytic reduction of Cr(VI) as a model compound under visible light irradiation. The results showed that the Ag doping and the calcination temperature played an important role on the microstructure and photocatalytic activity of the samples. Ag-doped TiO2 samples calcinated at 400°C exhibits higher photocatalytic activity than that of the other samples under visible light irradiation.
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