物理化学学报 >> 2010, Vol. 26 >> Issue (05): 1337-1342.doi: 10.3866/PKU.WHXB20100533

催化和表面结构 上一篇    下一篇

Cu/BiVO4复合光催化剂的制备及可见光催化活性

张爱平, 张进治   

  1. 北方工业大学理学院, 北京 100144
  • 收稿日期:2009-10-09 修回日期:2010-03-04 发布日期:2010-04-29
  • 通讯作者: 张爱平 E-mail:ncutalex@126.com

Syntheses and Activities of Visible-Light-Driven Cu/BiVO4 Composite Photocatalysts

ZHANG Ai-Ping, ZHANG Jin-Zhi   

  1. College of Sciences, North China University of Technology, Beijing 100144, P. R. China
  • Received:2009-10-09 Revised:2010-03-04 Published:2010-04-29
  • Contact: ZHANG Ai-Ping E-mail:ncutalex@126.com

摘要:

利用水热法制备了Cu掺杂的BiVO4复合可见光催化剂, 借助X射线衍射(XRD)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(DRS)和扫描电子显微镜(SEM)对其进行表征. XRD分析显示所有催化剂都呈现单斜结构. XPS结果显示掺杂元素均以其稳定氧化态形式存在于催化剂表面. DRS谱中掺杂样品的吸收边比纯BiVO4都有不同程度的红移. 以甲基橙(MO)的可见光催化降解反应为探针, 研究了催化剂的可见光催化性能. 结果表明, 经Cu 掺杂改性的催化剂的催化能力比纯BiVO4有所提高. 对其掺杂增强催化能力的可能原因进行了讨论.

关键词: 光催化, BiVO4, 复合光催化剂, 可见光, 水热法

Abstract:

Cu-doped BiVO4 photocatalysts were hydrothermally synthesized and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS), and scanning electron microscopy (SEM). XRD showed that all the photocatalysts have the same single monoclinic sheelite structure. XPS results show that Cu exists on the surface of the BiVO4 catalysts as their stable oxide cation species. An absorption edge red-shift was obtained by DRS studies. The photocatalytic activity was investigated using methyl orange (MO) as a photocatalytic degradation model reactant. Results showed that the Cu-doped catalysts enhanced photocatalytic activities under visible-light irradiation. An enhanced photocatalytic mechanismwas also discussed.

Key words: Photocatalysis, BiVO4, Composite photocatalyst, Visible-light, Hydrothermal method

MSC2000: 

  • O649