中文摘要：

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。

英文摘要：

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%.