Ba^(2+)掺杂FeVO_4光催化剂的制备及光催化性能  

SYNTHESIS OF Ba^(2+)/FeVO_4 PHOTOCATALYST AND ITS PHOTOCATALYTIC PROPERTIES

作　　者：王敏[1,2] 王里奥[2] 孙玉凤[1] 张文杰[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,沈阳110168 [2]重庆大学资源及环境科学学院,重庆400044

出　　处：《硅酸盐学报》2010年第7期1241-1246,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50774074);国家"973计划"(2005CB121104)资助项目

摘　　要：用液相沉淀法制备了钡掺杂钒酸铁(FeVO4)光催化剂。采用X射线衍射、扫描电子显微镜、能谱、比表面积、紫外-可见漫反射光谱和X射线光电子能谱对样品进行表征,并以甲基橙为模拟污染物对光催化性能进行测定。结果表明:Ba2+掺杂没有改变FeVO4晶型,部分Ba2+进入FeVO4晶格中引起晶格膨胀,晶胞体积增大。掺杂后表面形貌产生了较大变化,掺杂的钡生成新相BaV2O6附着在FeVO4晶体表面,起到表面修饰作用,但其比表面积基本无变化。掺杂Ba2+后其光吸收能力增强,禁带宽度减小。光催化脱色甲基橙溶液表明,适量Ba2+掺杂可提高FeVO4的光催化性能,在所进行的实验条件下,钒酸钡最佳掺杂量为12%(质量分数)时,掺杂后FeVO4对甲基橙溶液的脱色率较未掺杂前的提高31%左右。Bariumion（Ba2＋） doped iron（Ⅲ） vanadate（FeVO4） samples were prepared by a liquid phase precipitation method.The samples obtained were characterized by X-ray diffraction,scanning electron microsoope,energy dispersive spectrum,specific surface area,ultraviolet-visible diffuse reflectance spectroscopy（DRS） and X-ray photoelectron spectroscopy.The photocatalytic activity was investigated by photocatalytic oxidation of methyl orange（MO）.The XRD patterns indicate that Ba2＋/FeVO4 photocatalysts consist of triclinic phase and the lattice is distorted due to the doped Ba2＋.However,the new phase of BaV2O6 in a flake form attached on the FeVO4 particles played a role of the surface modification.There was almost no change on the specific surface area.The DRS results show that doping makes the light absorption increase.Doping with the appropriate Ba2＋ content can improve the photocatalytic activity of FeVO4.The optimal photocatalytic activity for all the prepared samples could be reached at the doped Ba2＋ of 12%（in mass）.The decoloration rate of the MO for the FeVO4 doped with Ba could be increased by 31%.

关 键 词：钒酸铁 光催化 钡掺杂 甲基橙溶液 液相沉淀法 

分 类 号：O643[理学—物理化学]