Abstract
Zinc-doped and undoped TiO2 photocatalysts were synthesized via sol-gel techniques. Doping of TiO2 with M2+ (M-Zn) was intended to create tail states within the band gap of TiO2. These can subsequently be employed as efficient photocatalysts which can effectively decompose organic contaminants only with visible light activation. The structure, physico-chemical and optical properties of the products were characterized by using the X-ray diffraction (XRD), Raman spectra, UV-vis diffuse reflectance spectroscopy (DRS) and electrochemical impedance spectroscopy (EIS) techniques. Doping shifts the optical absorption edge to the visible region and decreases the charge-transfer resistance. Under visible light, the composite nanoparticles very efficiently catalyze the MB dye. Results implied that Zn doping increased photoinduced charge transfer rate, and the use of described methods is a powerful tool toward predicting and understanding the photocatalytic processes and behaviors.
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