Preparation of point line Bi2WO6@TiO2 nanowires composite photocatalysts with enhanced UV/visible light driven photocatalytic activity
Abstract Bi 2 WO 6 @TiO 2 nanowires composite photocatalysts (BWO TNWS) with point line structures have been successfully fabricated by hydrothermalsynthesis method, and characterized by X ray powder diffraction (XRD) transmission electron microscopy (TEM) ultraviolet visible diffuse reflectance spectra (UV vis DRS) photoluminescence (PL) and electrochemical impedance spectroscopy (EIS) The effects of coupling narrow band gap semiconductor Bi 2 WO 6 (BWO) to photocatalytic activity for degrading Rhodamine B (RhB) and Phenol under UV vis light irradiation were investigated. The results demonstrate that the photocatalytic activities of the prepared photocatalysts are associated with the content of Bi 2 WO 6 (BWO) 20% BWO TNWS (containing 20 wt% BWO) composite exhibits the highest degradation rate for RhB and Phenol up to 78% and 33% respectively. It can be concluded that the improved photocatalytic performance of the BWO TNWS composite is mainly ascribed to its high photoinduced charge separation rate resulting from the effective heterojunction structure of BWO and TNWS, as well as the enlarged optical response range owing to coupling narrow band gap semiconductor BWO.