Vanadium(IV)-doped titanium dioxide (TiO2) photocatalyst powders were prepared by the sol–gel method and characterized by Brunauer–Emmett–Teller–specific surface area, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and ultraviolet-visible spectroscopy. V-doping in the TiO2 increases the crystal grain size, which decreases the specific surface areas of powders. This V-doping changes the band gap of TiO2, leading to extend the absorption to visible light regions (400–800 nm). Photocatalytic degradation of methylene blue (MB) in water was investigated as a function of the vanadium content in TiO2 and was found to follow pseudo first-order rate kinetics. Appropriate content of V-doping is an effective means to improve the photocatalytic activity of TiO2 for MB degradation under visible light irradiation.
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