化学学报 ›› 2011, Vol. 69 ›› Issue (21): 2597-2602.DOI: 10.6023/A1102272Z 上一篇    下一篇

研究论文

CeO2/TiO2复合纳米纤维的制备及光催化性能研究

李跃军1,2,曹铁平1,2,王长华1,邵长路*,1   

  1. (1东北师范大学先进光电子功能材料研究中心 长春130024)
    (2白城师范学院化学系 白城 137000)
  • 收稿日期:2011-02-27 修回日期:2011-04-30 出版日期:2011-11-14 发布日期:2011-07-08
  • 通讯作者: 李跃军 E-mail:bclyj@yahoo.com.cn
  • 基金资助:

    国家自然科学基金;教育部新世纪优秀人才支持计划

Fabrication and Enhanced Photocatalytic Properties of CeO2/TiO2 Composite Nanofibers

Li Yuejun1,2 Cao Tieping1,2 Wang Changhua1 Shao Changlu*,1   

  1. (1 Centre for Advanced Optoelectronic Functional Material Research, Northeast Normal University, Changchun 130024)
    (2 Department of Chemistry, Baicheng Normal College, Baicheng 137000)
  • Received:2011-02-27 Revised:2011-04-30 Online:2011-11-14 Published:2011-07-08

采用静电纺丝技术和水热合成法制备了CeO2/TiO2复合纳米纤维. 利用X射线衍射(XRD)、拉曼光谱(Raman)、扫描电镜(SEM)、透射电镜(TEM)和比表面积测定(BET)等分析测试手段对样品的形貌及结构进行了表征, 并以罗丹明B的脱色降解为模式反应, 考察了样品的光催化性能. 结果表明: CeO2纳米粒子均匀地生长在TiO2纳米纤维表面, 形成了异质结构的CeO2/TiO2复合纳米纤维光催化材料. 通过改变碱源, 可以得到不同形貌的CeO2. CeO2的存在增加了TiO2纳米纤维的比表面积, 有效地实现TiO2光生电子和空穴的分离, 增强了体系的量子效率, 与纯TiO2纳米纤维相比光催化活性明显提高. 初步探讨了异质结的形成机理.

关键词: CeO2/TiO2复合纳米纤维, 静电纺丝技术, 水热合成, 光催化

Heterostructured CeO2/TiO2 composite nanofibers were prepared via combination of hydrothermal growth and electrospinning technique. The morphology and structure of CeO2/TiO2 composite nanofibers were characterized by X-ray diffraction (XRD), Raman microscope (Raman), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and Brunauer-Emmett-Teller surface area (BET) analysis. The catalytic properties of the sample were studied via rhodamine B degradation as the model reaction. The results showed that CeO2 nanoparticles could evenly grow on the TiO2 nanofibers surface and thus heterostructured CeO2/TiO2 composite materials were successfully obtained. By selecting different alkaline source, CeO2/TiO2 heterostructures with different morphology of CeO2 nanostructures were facilely fabricated. The CeO2/TiO2 heterostructures showed enhanced photocatalytic efficiency compared with the bare TiO2 nanofibers under UV light irradiation. This is due to the reason that the presence of CeO2 nanostructures on TiO2 nanofibers can increase its surface area, and effectively achieve the separation of photoelectrons and holes, and thus enhancing the systems quantum efficiency. Last, the mechanism for the enhancement of photocatalytic activity of heterostructured nanofibers was discussed.

Key words: CeO2/TiO2 composite nanofiber, electrospinning technique, hydrothermal method, photocatalysis

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