微波–水热两步法合成花状Ag@AgBr/Bi_2WO_6及其可见光催化性能  

Ag@AgBr/Bi_2WO_6 Composites Prepared by Microwave–hydrothermal Two–Step Method and Its Visible–Light Photocatalytic Performance

作　　者：陈石林[1] 杨亦宸 戴高鹏[1,2] 刘素芹[1] 梁英[1] 

机构地区：[1]湖北文理学院化学工程与食品科学学院,湖北襄阳441053 [2]湖北文理学院汽车零部件装备数字化湖北省协同创新中心,湖北襄阳441053

出　　处：《硅酸盐学报》2016年第7期1059-1063,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(51508172;51572076;51378183);汽车零部件装备数字化湖北省协同创新中心开放基金(hbuas201502)

摘　　要：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。Flower–like Ag@AgBr/Bi2WO6 composite with visible–light photocatalytic activity was prepared by a microwave-hydrothermal two–step method. The samples were characterized by scanning electron microscopy, X–ray diffraction, X–ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy, and its photocatalytic activity was evaluated by the decomposition of methyl orange under visible–light irradiation. Results show that, Ag@AgBr particles were covered on the Bi2WO6 sheets, and atomic Ag formed on the surface of Bi2WO6. The photocatalytic activity of Ag@AgBr/Bi2WO6 is higher than that of pure Ag@AgBr or Bi2WO6. When the mole ratio of Ag@AgBr to Bi2WO6 is 1：5, the sample exhibits the optimal photocatalytic performance and stability. The enhanced photocatalytic activity could be attributed to the synergetic effects of surface plasmonic resonance of Ag nanoparticles and heterojunction formed between Ag@AgBr and Bi2WO6.

关 键 词：钨酸铋 银负载 微波-水热法 光催化 

分 类 号：O643.32[理学—物理化学]