Preparation and Characterization of N, S, F-Codoped Nanosize TiO2 with Ionic Liquid

N, S, F-co-doped TiO2 visible-light response photocatalyst(N-S-F-TiO2) was prepared with TiCl4, thiourea and ionic liquid ([C(6)min](+) [BF4](-)) via the microwave-catalytic hydrolysis precipitation process followed by calcination in an NH3/N-2 atmosphere. It was characterized by X-ray diffraction(XRD) X-ray photoelectron spectroscopy(XPS) and ultraviolet-visible diffusion reflectance spectroscopy(UV-Vis/DRS). Results showed that it was high purity anatase. The Ti-O-N, Ti-O-S and Ti-S bonds were formed in the TiO2 crystal and F used to dope TiO2 in the form of TiOF2. In the visible region 400 similar to 550 nm, it has strong absorption, and in 600 similar to 800 nm there was a strong absorption band. N-S-F-TiO2 prepared at volume ratio of [C(6)min](+) [BF4](-) /H2O of 5/95 exhibited the highest photocatalytic activity, and the degradation ratio of methyl orange was 95% under visible-light irradiation for 200 min. Multi-element co-doped synergistic effect was demonstrated by enhancement of the absorption in the visible region and higher visible light photocatalytic activity for N-S-F-TiO2.