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通过微波-水热两步法制备了花状Ag@Ag Br/Bi_2WO_6复合光催化剂。采用扫描电镜、X射线衍射、X射线光电子谱、紫外可见漫反射光谱等对样品进行了表征,通过可见光降解甲基橙检测了复合光催化剂的催化活性。结果表明:Ag@Ag Br颗粒覆盖在Bi_2WO_6片上,在复合光催化剂表面生成Ag~0。当Ag@Ag Br与Bi_2WO_6的摩尔比为1:5时,Ag@Ag Br/Bi_2WO_6的光催化活性最高,并有良好的稳定性,优于单一的Ag@Ag Br或Bi_2WO_6。Ag@Ag Br/Bi_2WO_6的光催化活性和稳定性增强的原因是由于纳米银粒子的表面等离子体效应和Ag Br与Bi_2WO_6间形成的异质结协同作用的结果。
The flower-like Ag @ Ag Br / Bi_2WO_6 composite photocatalyst was prepared by microwave-hydrothermal method. The samples were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and UV-vis diffuse reflectance spectroscopy. The photocatalytic activity of the composite photocatalysts was examined by visible light degradation of methyl orange. The results show that Ag @ Ag Br particles are coated on the surface of Bi_2WO_6 and Ag ~ 0 is formed on the surface of the composite photocatalyst. Ag @ Ag Br / Bi_2WO_6 had the highest photocatalytic activity and good stability when the molar ratio of Ag @ Ag Br to Bi_2WO_6 was 1: 5, which was better than that of Ag @ Ag Br or Bi_2WO_6. The reason for the enhanced photocatalytic activity and stability of Ag @ Ag Br / Bi_2WO_6 is the result of the synergistic effect of the surface plasmon effect of silver nanoparticles and the heterojunction formed between Ag Br and Bi_2WO_6.