Effect of Iron (III)-Doping on the Photocatalytic Activity of Titanium Dioxide Catalysts for Methylene Blue Degradation

Wen Churng Lin; Rui Liu; Wein Duo Yang

doi:10.4028/www.scientific.net/AMM.117-119.1088

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Effect of Iron (III)-Doping on the Photocatalytic Activity of Titanium Dioxide Catalysts for Methylene Blue Degradation
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 117-119Effect of Iron (III)-Doping on the Photocatalytic...

Effect of Iron (III)-Doping on the Photocatalytic Activity of Titanium Dioxide Catalysts for Methylene Blue Degradation

Abstract:

Iron-doped TiO₂ photocatalyst powders were prepared by the sol–gel method and characterized by Brunauer–Emmett–Teller (BET)-specific surface area, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Ultraviolet–Visible (UV-Vis) spectroscopy. Fe³⁺ doping in the TiO₂ decreases the crystal grain size, increases the specific surface areas of powders, extends the absorption to visible light regions (400~500 nm), and lowers the photocatalytic activity for methylene blue (MB) degradation under UV irradiation. The photocatalytic degradation of MB in water was investigated as a function of the Fe³⁺ content in TiO₂. It was found that under the irradiation of visible light, a small amount of Fe³⁺ dopant in TiO₂2 powders could obviously enhance the photocatalytic activity. When the Fe³⁺ content was in the range of 0.03–0.1 mol%, the photocatalytic activity of the samples was higher than that of undoped TiO₂. Appropriate content of Fe-doping is an effective means to improve the photocatalytic activity of TiO2 for MB degradation under visible light irradiation.