高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (11): 2348-2353.doi: 10.7503/cjcu20190302

• 物理化学 • 上一篇    下一篇

三维网状Dy 3+∶YVO4/TiO2复合纤维的制备及光催化产氢性能

孙大伟1,2,李跃军2,曹铁平2,*(),赵艳辉2,杨殿凯2   

  1. 1. 吉林师范大学化学学院, 四平 136000
    2. 白城师范学院化学学院, 白城 137000
  • 收稿日期:2019-05-27 出版日期:2019-11-10 发布日期:2019-09-05
  • 通讯作者: 曹铁平 E-mail:bcctp2008@163.com
  • 基金资助:
    国家自然科学基金(21573003);国家级大学生创新创业训练计划项目资助(201810206003)

Preparation of Dy 3+-doped YVO4/TiO2 Composite Nanofibers with Three-dimensional Net-like Structure and Enhanced Photocatalytic Activity for Hydrogen Evolution

SUN Dawei1,2,LI Yuejun2,CAO Tieping2,*(),ZHAO Yanhui2,YANG Diankai2   

  1. 1. College of Chemistry, Jilin Normal University, Siping 136000, China
    2. College of Chemistry, Baicheng Normal University, Baicheng 137000, China
  • Received:2019-05-27 Online:2019-11-10 Published:2019-09-05
  • Contact: CAO Tieping E-mail:bcctp2008@163.com
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21573003);The National College Students’ Innovative Entrepreneurship Training Program, China(201810206003)

摘要:

以电纺TiO2纳米纤维为基质, 柠檬酸为软模板, 采用一步水热法制备了具有三维立体网状结构的稀土Dy 3+掺杂YVO4/TiO2复合纤维. 通过X射线衍射、 扫描电子显微镜、 X射线光电子能谱、 N2吸附-脱附、 紫外-可见漫反射光谱及荧光光谱等手段对材料的组成、 表面形貌和性能进行表征, 以光分解水产氢实验考察其光催化活性. 结果表明, Dy 3+∶YVO4纳米枝与TiO2纳米纤维相互交联构筑的纳米纤维网具有大比表面积, 可提供更多活性位点, 改善了多相光催化反应的传递过程; 稀土Dy 3+掺杂的YVO4与TiO2复合形成异质结相互促进, 在拓宽光谱响应范围、 提高太阳光利用率的同时使光生电子-空穴对得到较好分离, 从而提高了样品的光催化活性. 模拟太阳光照射下, Dy 3+∶YVO4/TiO2复合纤维光催化产氢速率达到8.63 mmol· h -1·g -1, 是纯TiO2纳米纤维的10倍.

关键词: Dy 3+掺杂YVO4/TiO2, 复合纤维, 一步水热法, 光催化产氢

Abstract:

By employing electrospun TiO2 nanofibers as substrate and citric acid as soft template, rare earth Dy 3+-doped YVO4/TiO2 composite nanofibers with net-like structure were prepared via one-step hydrothermal method. The composition, surface morphology and properties were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption-desorption, ultraviolet-visible diffuse reflectance spectrum and fluorescence spectrum. The photocatalytic activity of Dy 3+-doped YVO4/TiO2 compo-site nanofibers was investigated via production of hydrogen from water splitting. The results show that cross-linking and assembly of Dy 3+∶YVO4 nano-branch and TiO2 nanofibers allows a higher surface area. More active sites could be provided and the mass transfer process during heterogeneous photocatalytic reaction was improved. Moreover, the formation of Dy 3+-doped YVO4/TiO2 heterojunction could widen the spectral response and improve the utilization of solar light. Meanwhile, the separation of photogenerated electron-hole pairs can be achieved. Thus, the photocatalytic activity towards hydrogen production was improved. The photocatalytic production rate of hydrogen reached 8.63 mmol·h -1·g -1 under sunlight irradiation, which was 10 times that of pure TiO2 nanofibers.

Key words: Dy 3+-doped YVO4/TiO2, Composite fibers, One-step hydrothermal method, Photocatalytic hydrogen production

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