Photoelectrocatalytic oxidation of hair dye basic red 51 at W/WO3/TiO2 bicomposite photoanode activated by ultraviolet and visible radiation.

We prepared a W/WO₃/TiO₂ bicomposite photoanode by simple electrochemical anodization of W foil, followed by cathodic electrodeposition of TiO₂ and annealing at 450°C for 30min. This photoanode shows good photoactivity under irradiation with UV and visible light. In optimized conditions, it promotes complete photoelectrocatalytic oxidation of 3.33×10⁻⁵ molL⁻¹ basic red 51 solution (which is used in hair dye) at 0.1molL⁻¹ Na₂SO₄, pH 2.0, under a current density of 1.25mAcm⁻² and ultraviolet and visible radiation–total organic carbon removal is 94 and 88%, respectively. This effect paves the way for the sustainable solar-assisted remediation of water bodies contaminated with organic components of hair dyes. [ABSTRACT FROM AUTHOR]