Abstract
Sol-gel coprecipitation method provides a facile and affordable synthesis methodology for bismuth-doped TiO2 photocatalysts. The effective doping of TiO2 widens the photoactivity of the catalyst enabling effective electron excitation under visible light irradiation. Different doping percentages of bismuth can modulate the photocatalytic response and provide engineered control over the bandgap energy of the semiconductor. Characterization demonstrated that 5 % doping provides an optimum balance on the photocatalytic properties as well as the effectiveness in the treatment of indigo carmine (IC) used as a model organic pollutant compound. This by increasing the size of the anatase crystals to 65.87 nm, improving the specific surface to 116.3 m2/g, and lowering the Egap of TiO2 to 2.98 eV.
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