Abstract
CuO/F-TiO2nanoparticle photocatalyst was prepared by ball milling. The photocatalyst was characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy, and photoluminescence emission spectroscopy. The photocatalytic activity was evaluated by photocatalytic oxidation of rhodamine B and reduction of Cr2O7 2−. The results showed that, for F-TiO2photocatalyst, the photooxidation activity increases remarkably with the increasing amount of NH4F up to 1.0 g, and the photoreduction activity decreases gradually with the increase in the amounts of NH4F. For the CuO/F-TiO2photocatalyst, the photoreduction activity increases greatly with the increase in the amount of doped p-CuO up to 1.0 wt.%, and the photooxidation activity decreases rapidly with the increase in the amounts of doped p-CuO. Compared with pure TiO2, the photoabsorption wavelength range of the CuO/F-TiO2and F-TiO2photocatalysts red shifts and improves the utilization of the total spectrum. The effect of ball milling time on the photocatalytic activity of the photocatalysts was also investigated. The mechanisms of influence on the photocatalytic activity of the photocatalysts were also discussed.
Highlights
Since Fujishima and Honda discovered the photocatalytic splitting of water on titanium dioxide (TiO2) electrodes in 1972 [1], TiO2 as a photocatalyst has been extensively studied because it has relatively high photocatalytic activity, biological and chemical stability, low cost, nontoxicity, and longterm stability against photocorrosion and chemical corrosion [2,3,4,5,6,7,8,9]
The results showed that the photocatalytic oxidation activity of the fluorinated TiO2 (F-TiO2) is much higher than that of TiO2 by reason of the extension of the photoabsorption wavelength as a result of doped F element [25,26,27]
The results showed that, compared with pure TiO2, the p-n junction photocatalysts have higher photocatalytic reduction activity, but lower photocatalytic oxidation activity
Summary
Since Fujishima and Honda discovered the photocatalytic splitting of water on titanium dioxide (TiO2) electrodes in 1972 [1], TiO2 as a photocatalyst has been extensively studied because it has relatively high photocatalytic activity, biological and chemical stability, low cost, nontoxicity, and longterm stability against photocorrosion and chemical corrosion [2,3,4,5,6,7,8,9]. Many investigators have quested for various methods, such as doping transition metals [12,13,14,15], doping nonmetallic elements [16,17,18,19,20], and forming composite photocatalysts from different semiconductors [21,22,23,24], and so forth, to enhance the photocatalytic activity of TiO2 and to improve the utilization of visible light. The results showed that the photocatalytic oxidation activity of the F-TiO2 is much higher than that of TiO2 by reason of the extension of the photoabsorption wavelength as a result of doped F element [25,26,27]. The results showed that, compared with pure TiO2, the p-n junction photocatalysts have higher photocatalytic reduction activity, but lower photocatalytic oxidation activity. The mechanisms of International Journal of Photoenergy influence on the photocatalytic activity of the CuO/FTiO2photocatalyst were discussed
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