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Bi-doped TiO2 with Remarkably Enhanced Photocatalytic Activity Under Simulated Sunlight Induced by Increased Hydrophilicity and Light Absorption Ability

Abstract Bi-doped TiO2 was prepared with sol-gel method and was characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-visible diffuse reflectance spectroscopy (UV-vis DRS) and Fourier transform infrared spectroscopy (FTIR). Bi-doped TiO2 particles were nearly spherical with about 10 nm in size. Analysis by XPS indicated that the introduced Bi was probably incorporated into TiO2 and may replace Ti. FTIR analysis found that doping Bi could enhance the hydrophilicity of TiO2. A red-shift of the absorption edge in the spectrum of UV-vis absorption was observed. Under xenon lamp irradiation, the Bi-doped TiO2 exhibited enhanced photodegradation efficiency than TiO2, and the kinetic constant of MO removal with Bi-Ti-0.006 (0.011 min-1) was 3.8 times as great as that with TiO2 (0.0029 min-1). The remarkably enhanced photocatalytic ability was attributed to the improved hydrophilicity and increased light absorption ability.