Résumé
The biomass multi-elements self-doped TiO2was synthesized simultaneously by ultrasonic irradiation assisted sol-gel method, and characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (UV-Vis-DRS), Fourier transform infrared (FT-IR) spectroscopy, and photoluminescence (PL). The characterization results showed that,multiple elements, C, N, P, Cl and K, were doped in the composite TiO2. Compared with pure TiO2,the band gap of the composite catalyst was narrowed by 0.21 eV, and possessed more surface hydroxyl radical and active sites, lower recombination rate of photo-generated carriers, higher crystallinity and higher specific surface area. The photocatalytic ability of the composite catalyst was studied,using methylene blue (MB) as target pollutant. The experimental results showed that, under visible light irradiation,the degradation efficiency of methylene blue was up to 98% after photocatalytic reaction for two hours by the composite catalyst.