Preparation And Degradation Performance To Environmental Pollutant Of Bi-Composed Photocatalyst

In this work, we report the facile conversation from BiOCl to a variety of compounds (BiOF,Bi7F11O5 and BiF3) by a novel, simple anion exchange approach,in which the effects of F/Bi molar ratio, fluorine source and reaction solvent on the products are mainly investigated. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM),high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller (BET)surface area, UV-vis diffuse reflectance spectroscopy (UV-DRS),Photoluminescence (PL) and Electrochemical impedance spectroscopy (EIS).Furthermore, the conversion mechanism is proposed and the photocatalytic activities of the samples are also investigated. It is amazing that the photocatalytic activity of the as-formed Bi7F11O5BiOCl composite is 3 times higher than that of BiOCl for the degradation of methyl orange (MO). We believe that the enhanced photocatalytic activity is mainly attributed to the formation of Bi7F11O5/BiOCl heterojunction,which has significantly improved the separation efficiency of photogenerated carriers.Importantly, this study provides a simple, efficient method for material transformation.