A series of tungsten‐doped Titania photocatalysts were synthesized using a low‐temperature method. The effects of dopant concentration and annealing temperature on the phase transitions, crystallinity, electronic, optical, and photocatalytic properties of the resulting material were studied. The X‐ray patterns revealed that the doping delays the transition of anatase to rutile to a high temperature. A new phase WyTi1‐yO2 appeared for 5.00 wt% W‐TiO2 annealed at 900 °C. Raman and diffuse reflectance UV–Vis spectroscopy showed that band gap values decreased slightly up to 700 °C. X‐ray photoelectron spectroscopy showed that surface species viz. Ti3+, Ti4+, O2−, oxygen‐vacancies, and adsorbed OH groups vary depending on the preparation conditions. The photocatalytic activity was evaluated via the degradation of methylene blue using LED white light. The degradation rate was affected by the percentage of dopants. The best photocatalytic activity was achieved with the sample labeled 5.00 wt% W‐TiO2 annealed at 700 °C.
Sol-gel grown TiO 2 thin films are deposited on glass substrates by spincoating, using noble metals (M ¼ Ag, Au, Pd, and Pt) for doping. The films are thermally treated at 500 C, to obtain the anatase phase. The film properties are characterized by field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Raman spectroscopy, profilometry, and UV/VIS/NIR spectroscopy. FE-SEM images and EDX measurements show the presence of dopant elements in the metallic form. XRD and Raman measurements show the presence of the anatase phase for pure and doped samples. Optical measurements show the optical band gap decreases for Au and Pt doping, while it shows little change for Ag and Pd doping, compared to pure TiO 2 . The photocatalytic activity of all films is evaluated by measuring the rate of decolorization of methylene blue (MB) under UV irradiation. The normalization of the rate of degradation of MB according to the film thickness shows significant photocatalytic activity of all films with the following order Pt-TiO 2 > Pd-TiO 2 >
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