Preparation Of Bi₂WO₆Based Materials By Electrospinning Technique As Visible Light Catalysts

Bi2WO6is a kind of steady and nontoxic semi-conductive material, which has a band gap of2.74eV2.90eV and could be active in the visible region. Bi2WO6possesses excellent photocatalysed performance and could degradation organic pollutant with visible light irradiation. Therefore, the effective improving the light absorption and choose a preferable preparation technique becomes one of the most important subjects for photocatalysts.Considering the particular physical and chemical properties of material, so, in the present research, we prepared Bi2WO6material by electrospinning technique as a visible light active catalyst. In order to improve the photocatalytic activity of the Bi2WO6, the V5+was incorporated into Bi2WO6crystal lattice to modify the properties of Bi2WO6and extend its light absorption in visible region. Based on this research, the influences of V-doped and the thermal treatment temperature on the and morphology and structure of the synthesized materials were discussed. The details and results of this work as following:(1) PVP/C6H13BiN207·H2O-(NH4)]10W12O41precursors have been successfully fabricated by electrospinning technique, and then the electrospun precursors were calcined at different temperatures. The materials were characterized by thermogravimetry-differential thermal analysis(TG-DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (FE-SEM) and UV-Vis-NIR diffuse reflectance (UV-Vis-NIR/DR), respectively. The visible-light photocatalytic activity of samples were evaluated by employing rhodamine B(RhB) as a probe. The results suggest that Bi2WO6are obtained at600℃and the best photocatalytic activity is achieved when using Bi2WO6as a catalyst under visible light irradiation.(2) In order to improve the photocatalytic activity of the Bi2WO6, the V5+was incorporated into Bi2WO6crystal lattice using the NH4VO3and (NH4)10W12O41and C6H13BiN2O7·H2O as the materials. XPS, XRD and so on were employed to study the influences of V-doped and the thermal treatment temperature on the structure and morphology of the synthesized Bi2W0.6V0.4O6-δ, materials are obtained at600℃. Importantly, the visible-light photocatalytic activity of samples were evaluated by employing rhodamine B(RhB) as a probe. Cycle performance of mterials were discussed. The results showed that the structure of samples does not change after doping, but degree of crystallinity was reduce and the band gap was shorten with V-doped. And the doped samples appear higher decolorization efficiency than undoped samples.The composite Bi2W0.6V0.4O6-δ photocatalysts kept stable in the photocatalysis.