Pr掺杂Bi_2MoO_6/TiO_2复合纳米纤维的制备及可见光催化性能

以电纺TiO_2纳米纤维为基质,采用溶剂热法制备了稀土Pr掺杂Bi_2MoO_6/TiO_2复合纳米纤维,利用X射线衍射仪、扫描电子显微镜、透射电子显微镜、紫外-可见-近红外分光光度计和荧光光谱仪等对不同样品的物相、形貌和光学性能等进行表征,以甲基橙为模拟有机污染物,考察了样品的光催化性能.结果表明,在复合样品中,Pr~(3+)进入Bi_2MoO_6晶格,部分取代Bi~(3+)形成施主能级,导致能级带隙变窄,不仅有利于提高样品的可见光催化活性,抑制光生电子-空穴对复合,而且还提高了Bi_2MoO_6/TiO_2的光催化活性和稳定性.当Pr的掺杂量为3%(摩尔分数)时,光催化降解甲基橙的效果最佳,可见光照射180 min时降解率达到93.8%,比纯Bi_2MoO_6/TiO_2的降解率有明显提高.

Preparation and Photocatalytic Properties of Pr-doped Bi2MoO6/TiO2Composite Nanofibers Under Visible Light Irradiation

Praseodymium-doped Bi2MoO6 / TiO2 composite nonafibers were prepared via solvothermal growth of Bi2MoO6 nanostructures on the substance of the electrospun anatase TiO2 nanofibers. The phase composition, morphology, microstructure and optical properties of the samples were characterized by X-ray diffraction scanning electron microscopy, energy dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The photocatalytic activity of the samples were evaluated by photodegradation of methyl orange solution under visible light. The results showed that the Pr3+ was incorporated into the Bi2MoO6 crystal lattice to form the donor level, which facilitated the activation of the photocatalyst by visible light, retarded the recombination of photo-induced electrons-holes, and inhibited the leaching of dopants, leading to an enhanced activity and good recycling sta-bility. The 3%(molar faction) Pr-doped Bi2MoO6 / TiO2 photocatalyst exhibited the best activity, with a MO degradation rate of 93. 8% after visible light irradiation for 180 min. The Pr-doped Bi2MoO6 / TiO2 composite nanofibers exhibited superior photocatalytic activity compared to the Bi2MoO6 / TiO2 composite nanofibers.