Ag和介孔碳改性Bi_2WO_6光催化剂的合成及其可见光下的光催化性能  

Synthesis of Ag and mesoporous carbon modified Bi_2WO_6 photocatalyst and its photocatalytic property in visible light

作　　者：刘旺平[1] 王鑫[1] 张帅[1] 乐树坤 赵谦[1] 姜廷顺[1] 

机构地区：[1]江苏大学化学化工学院,镇江212013

出　　处：《复合材料学报》2015年第4期1187-1193,共7页Acta Materiae Compositae Sinica

基　　金：江苏大学高级人才基金(10JDG114)

摘　　要：采用水热法合成了花球状的Bi2WO6和介孔碳CMK-3/Bi2WO6的光催化剂,然后通过光还原得到了Ag负载的Ag/Bi2WO6和Ag-CMK-3/Bi2WO6,制备出可见光下具有高活性的光催化剂。利用紫外-可见漫反射光谱(UV-Vis DRS)、X射线衍射(XRD)、透射电子显微镜(TEM)、高分辨透射电子显微镜(HR-TEM)和扫描电子显微镜(SEM)对制备的样品进行表征,评价样品在可见光照射下降解亚甲基蓝(MB)的光催化活性。并研究了CMK-3和Ag负载在Bi2WO6上都能提高其光催化活性的机制。结果表明:CMK-3或Ag负载在Bi2WO6上都能大幅提高Bi2WO6的光催化活性,Ag-CMK-3/Bi2WO6光催化剂的光催化性能优于Ag/Bi2WO6和CMK-3/Bi2WO6光催化剂。Flower sphere-like Bi2WO6 and mesoporous carbon CMK-3/BizWO6 photocatalysts were synthesized by hydrothermal method, and then Ag/Bi2WO6and Ag/CMK-3/Bi2WO6were prepared via a photoreduction process in order to obtain the photocatalysts with high visible light activities. The as-prepared samples were characterized by ultraviolet-visible diffuse reflectance spectroscopy （UV-Vis DRS）, X-ray diffraction （XRD）, transmission electron microscope（TEM）, high resolution transmission electron microscope （HR-TEM） and scanning electron microscope （SEM）. The photocatalytic activities of the samples were evaluated by the photodegradation of methylene blue （MB） under visible light irradiation. The mechanism for the enhancement of the photocatalytic activity of CMK-3 and Ag-loaded BizWOs was also investigated. The results show that CMK-3 or Ag loading greatly improves the photocatalytic activity of Bi2 WO6, the photocatalytic activity of Ag/CMK-3/Bi2 WO6 photocatalyst is superior to the activities of CMK-3/Bi2 WO6 and Ag/Biz WO6 photocatalysts.

关 键 词：介孔碳 Bi2WO6 负载 可见光催化 

分 类 号：O643[理学—物理化学]