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The photocatalytic activity of nanostructured N-doped TiO 2  catalyst towards the simultaneous photocatalytic reduction of Cr(VI) and benzoic acid degradation, was investigated under various UV and visible light irradiation conditions. Commercial TiO 2  Degussa P25 was also used for comparison purposes. The effect of irradiation wavelength on the photogeneration of hole/electron pairs was evaluated in detail by electron paramagnetic resonance (EPR) spectroscopy. EPR measurements revealed that P 25 becomes total inactive in terms of Ti 3+  centers at λ&gt;455 nm in contrast with N-TiO 2  which retains 80% of its maximum capacity. Both catalysts were also tested under simulated solar irradiation and visible light. The photocatalytic results demonstrated that N-TiO 2  possessed much higher photocatalytic activity than P 25 for reduction of aqueous Cr(VI) under both simulated-solar and visible irradiation.

Mechanism of Synergistic Photocatalytic Cr(VI)-reduction and Benzoic Acid Oxidatiοn by Visible Light Active TiO 2 Photocatalysts