采用一步溶剂热法合成了Bi4Ti3O12/BiOBr复合光催化剂, 采用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、比表面积及孔径测定仪(BET)以及紫外可见 漫反射光谱仪(DRS)等对样品的组成、形貌及可见光催化性能等进行了表征, 讨论了合成条件对样品光催化活性的影响, 探究了光催化反应过程中的活性物种 及反应机理。研究结果表明, Bi、Ti、Br的投料比为10∶7∶5、乙二醇为溶剂、聚乙烯吡咯烷酮为表面活性剂且加入量为0.2 g时, 合成样品具有较高的光催 化活性和较好的循环稳定性。在7 W LED灯照射140 min后, 光催化剂对罗丹明B(RhB)的降解率达到85.1%。?O-2与h+在降解过程中起主要作用。

Bi4Ti3O12/BiOBr composite photocatalyst was prepared by one step solvothermal method. The composition, morphology and photocatalytic property of the sample were determined by X-ray diffraction, scanning electron microscopy, specific surface area aperture analyzer and ultraviolet-visible diffuse reflectance spectrometer. The influence of synthesis conditions on photocatalytic activity of sample was discussed. The active species and reaction mechanism in the process of photocatalytic reaction were explored. The results show that the as-prepared sample has high photocatalytic activity and good cycling stability while the ratio of Bi, Ti, Br is 10∶7∶5, ethylene glycol is used as solvent, polyvinylpyrrolidone is used as surfactant and its additive amount is 0.2 g. After 140 min of irradiation by 7 W LED lamp, the degradation rate of photocatalyst reaches 85.1%. ?O-2 and h+play a major role in the degradation process.