钨酸铋/磷钨酸复合光催化剂的制备及性能研究

Preparation and Performance of Barium Tungstate/Phosphorous Tungstate Composite Photocatalyst

采用简便有效的方法制备了PW_(12)/Bi_(2)WO_(6)复合光催化剂,并利用红外光谱(FTIR)、X-射线衍射(XRD)、扫描电子显微镜(SEM)和光电化学测试等方法对所制得的纳米复合光催化剂进行了表征。在可见光下,以孔雀石绿(MG)溶液作为反应模型,考察了PW_(12)/Bi_(2)WO_(6)纳米复合光催化剂的光催化活性。在可见光下,PW_(12)/Bi_(2)WO_(6)光催化剂对MG的光催化降解性能明显优于纯Bi_(2)WO_(6)。PW_(12)/Bi_(2)WO_(6)复合材料具有较高的光催化活性,在4h内光催化降解率>99%,几乎是纯Bi_(2)WO_(6)的2倍。探讨了增强型光催化剂的作用机理。PW_(12)的引入提高了Bi_(2)WO_(6)的电荷分离效率,抑制了Bi2WO6的电子-空穴复合,从而有效地提高了Bi_(2)WO_(6)的光催化活性。

The PW_(12)/Bi_(2)WO_(6)composite photocatalyst was prepared with a simple and effective method,and the obtained nanocomposite photocatalyst was represented by infrared spectroscopy(FTIR),X-ray diffraction(XRD),scanning electron microscopy(SEM)and photochemical testing.Photocatalytic activity of PW_(12)/Bi_(2)WO_(6)nanocomposite photocatalysts was investigated under visible light with the Malachite green(MG)solution as the reaction model.Under visible light,the photocatalytic degradation performance of PW_(12)/Bi_(2)WO_(6)photocatalyst on MG is significantly better than that of pure Bi_(2)WO_(6).The PW_(12)/Bi_(2)WO_(6)composite has high photocatalytic activity with a photocatalytic degradation rate of>99%in 4h,almost twice that of pure Bi_(2)WO_(6).The mechanism of action of enhanced photocatalyst is discussed.Introduction of PW_(12)improves the charge separation efficiency of Bi_(2)WO_(6),inhibits electron-hole recombination of Bi_(2)WO_(6),and thus effectively improves the photocatalytic activity of Bi_(2)WO_(6).