Cấu trúc và hoạt tính quang xúc tác của bột nano W-TiO2 được điều chế bằng phương pháp ướt

Abstract

Tungsten-doped nanosized TiO₂ powders were synthesized by a simple wet method, and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-Vis diffuse reflectance spectra (UV-Vis DRS). The photocatalytic activity of undoped TiO₂ and W-doped TiO₂ photocatalysts was evaluated by the photocatalytic oxidation of methylene blue in aqueous solution under visible light irradiation to study the influence of the tungsten doping degree on the photocatalytic degradation performance of TiO₂. The results showed that the photocatalytic activity of the W-doped TiO₂ photocatalyst is much higher than that of undoped TiO₂, and the optimum W/Ti molar ratio is 0.5%. Moreover, the study also showed that, the doping W atoms suppress the growth of the TiO₂ crystal and phase transformation.

Keywords: Titanium dioxide, Tungsten, photocatalyst, W-doped TiO₂, methylene blue,wet method.