高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (12): 2313-2319.doi: 10.7503/cjcu20170097

• 物理化学 • 上一篇    下一篇

Pr掺杂Bi2MoO6/TiO2复合纳米纤维的制备及可见光催化性能

李跃军, 曹铁平, 梅泽民(), 席啸天, 王霞   

  1. 白城师范学院化学学院, 纳米光催化材料研究中心, 白城 137000
  • 收稿日期:2017-02-20 出版日期:2017-12-10 发布日期:2017-11-23
  • 作者简介:联系人简介: 梅泽民, 男, 博士, 教授, 主要从事有机污染物降解研究. E-mail: bczeminmei@163.com
  • 基金资助:
    国家自然科学基金(批准号: 21573003)和吉林省自然科学基金(批准号: 20140101118JC)资助

Preparation and Photocatalytic Properties of Pr-doped Bi2MoO6/TiO2 Composite Nanofibers Under Visible Light Irradiation

LI Yuejun, CAO Tieping, MEI Zemin*(), XI Xiaotian, WANG Xia   

  1. Research Centre of Nano Photocatalyst Materials, School of Chemistry,Baicheng Normal University, Baicheng 137000, China
  • Received:2017-02-20 Online:2017-12-10 Published:2017-11-23
  • Contact: MEI Zemin E-mail:bczeminmei@163.com
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21573003) and the Natural Science Fund of Jilin Province, China(No.201410111810)

摘要:

以电纺TiO2纳米纤维为基质, 采用溶剂热法制备了稀土Pr掺杂Bi2MoO6/TiO2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, Pr3+进入Bi2MoO6 晶格, 部分取代Bi3+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Bi2MoO6/TiO2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Bi2MoO6/TiO2的降解率有明显提高.

关键词: 静电纺丝, Pr掺杂, Bi2MoO6/TiO2, 可见光催化

Abstract:

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 stability. 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.

Key words: Electrospinning technique, Praseodymium-doping, Bi2MoO6/TiO2, Visible light photcatalysis activity

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