新型可见光活性氧化钯/钒酸铋复合光催化剂的制备及其光催化性能  

PREPARATION AND PHOTOCATALYTIC PERFORMANCE OF NOVEL PALLADIUM OXIDE/ BISMUTH VANADATE VISIBLE LIGHT INDUCED COMPOSITE PHOTOCATALYSTS

作　　者：戈磊[1] 崔立山[1] 

机构地区：[1]中国石油大学(北京),材料科学与工程系,北京102249

出　　处：《硅酸盐学报》2008年第3期320-324,共5页Journal of The Chinese Ceramic Society

基　　金：博士点基金项目(20050425002)资助项目

摘　　要：通过浸渍法制备了新型可见光活性的氧化钯(PdO)/钒酸铋(BiVO4)复合光催化剂。采用X射线衍射、扫描电子显微镜、X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)、紫外-可见吸收光谱等测试手段对复合光催化剂的物理和光学性质进行了表征。在可见光(λ>400nm)照射下考察了PdO/BiVO4样品降解甲基橙的光催化性能。结果表明:PdO/BiVO4光催化剂为单斜相结构,晶粒形貌呈十字花或球形。XPS结果显示:复合光催化剂中掺杂的钯(Pd)元素是以PdO的形式存在的。与纯BiVO4样品相比,复合光催化剂可见光降解甲基橙的活性显著增强。这种新型复合光催化剂的光催化性能提高的原因可能是由于催化剂中光生载流子的高效分离造成的。Novel palladium oxide （PdO）/bismuth vanadate （BiVO4） visible light-induced composite photocatalysts were prepared by the impregnation method. The physical and optical properties of the composite photocatalysts were characterized by X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy （XPS）, and ultraviolet-visible absorption spectroscopy. The photocatalytic performance of the PdO/BiVO4 samples was evaluated by decolorization of methyl orange under visible light （λ〉400 nm） irradiation. The results indicate that the PdO/BiVO4 photocatalysts are monoclinic phase and consist of quatrefoil-like and spherical particles. The XPS results reveal that the doped Pd species exists in the form of PdO. The composite samples show superior visible light-induced photocatalytic degradation of methyl orange compared to the pure BiVO4 sample. The efficient separation of photo-generated carriers is considered to be the possible reason for the enhanced photocatalytic performance of these composite photocatalysts.

关 键 词：钒酸铋 光催化 可见光 甲基橙 

分 类 号：O643.32[理学—物理化学]