Construction of Double S-scheme YVO4/TiO2/BiVO4 Heterojunction and Its Photocatalytic CO2 Reduction Performance

The double S-scheme heterojunction of YVO4/TiO2/BiVO4 compoite fibers material was prepared by one-step hydrothermal method using TiO2 electrospun nanofibers as substrate. The structures of the composite catalyst were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, ultraviolet visible diffuse reffectance spectroscopy and photoluminescence. The performance of photocatalytic CO2 reduction over the composite catalyst under simulated sunlight was studied. The results show that photocatalytic activity of YVO4/TiO2/BiVO4 composite fibers was investigated via production of methanogenesis from photocatalytic reduction of CO2. The CO2 reduction capability of composite fibers was better compared to that of monomer materials. The photocatalytic production rate of CH4 and CH3OH of YVO4/TiO2/BiVO4 were 13.88 and 3.46 mu mol<middle dot>g-1<middle dot>h-1, respectively. The increased photocatalytic activity of YVO4/TiO2/BiVO4 is attributed to the formation of heterojunctions between YVO4, BiVO4 and TiO2 as well as the S-scheme charge transfer mode of the photogenerated carriers, both of which are conducive to separation efficiency of photo-generated carriers and photocatalytic CO2 reduction activity.