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The photocatalytic degradation of methylene blue (MB) has been investigated under visible light irradiation with an incandescent light bulb using chromium doped TiO 2 nanoparticles. Cr-TiO 2 photocatalysts were successfully synthesized by sol-gel method at room temperature and characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), Raman spectroscopy, Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy. The band gap energy of the nanoparticles were estimated using UVVis DRS technique. With increasing Cr 3? cations content into TiO 2 host lattice, the optical absorption band tuned in the visible region. XRD and TEM results reveal uniform and crystalline anatase TiO 2 nanoparticles. The photodegradation of MB indicated that the photocatalytic activity of pure TiO 2 nanoparticles increased with increasing Cr 3? cations concentration.

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