物理化学学报 >> 2013, Vol. 29 >> Issue (04): 813-820.doi: 10.3866/PKU.WHXB201301151

催化和表面科学 上一篇    下一篇

表面Cu2O纳米颗粒修饰高效促进γ-Bi2MoO6的可见光催化活性

杨自嵘1, 韩玉琦1, 王芳1, 刘倩1, 张扬1, 敏世雄1,2   

  1. 1 河西学院化学化工学院, 甘肃省高校河西走廊特色资源利用省级重点实验室, 甘肃张掖 734000;
    2 中国科学院兰州化学物理研究所, 羰基合成和选择氧化重点实验室, 甘肃兰州, 730000
  • 收稿日期:2012-10-31 修回日期:2013-01-14 发布日期:2013-03-25
  • 通讯作者: 韩玉琦, 王芳 E-mail:hanyq@hxu.edu.cn; wangfang987@126.com
  • 基金资助:

    国家自然科学基金(51263008), 河西学院校长基金(XZ2010), 河西学院大学生科技创新项目和甘肃省高校河西走廊特色资源利用省级重点实验室面上项目(XZ1012)资助

Significantly Improved Visible Light Photocatalytic Activity of γ-Bi2MoO6 by Surface Modification with Cu2O Nanoparticles

YANG Zi-Rong1, HAN Yu-Qi1, WANG Fang1, LIU Qian1, ZHANG Yang1, MIN Shi- Xiong1,2   

  1. 1 Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities , College of Chemistry and Chemical Engineering , Hexi University, Zhangye 734000 , Gansu Province, P. R. China;
    2 State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, P. R. China
  • Received:2012-10-31 Revised:2013-01-14 Published:2013-03-25
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51263008), Principal Fund of Hexi University, China (XZ2010), University Science and Technology Innovation Project of Hexi University, China, and General Projects of Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, China (XZ1012).

摘要:

采用水热法在γ-Bi2MoO6光催化剂表面修饰了纳米级Cu2O, 得到了具有高效可见光响应的复合光催化材料, 并利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、选区电子衍射(SAED)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis-DRS)等技术对其相结构、微观形貌和光吸收性能进行了表征. 在可见光条件下(λ>400 nm)考察了Cu2O表面修饰对γ-Bi2MoO6光催化降解亚甲基蓝(MB)性能的促进作用. 结果表明, 纳米级Cu2O(~10 nm)颗粒均匀地修饰于γ-Bi2MoO6的表面, 使γ-Bi2MoO6的可见光吸收带发生明显红移, 且吸收强度大幅提高, 增强了复合材料光生电子-空穴对的分离效率, 从而使复合材料表现出较高的光催化活性. 当Cu2O的表面修饰量为1.5%(w)时, 复合光催化剂降解MB的活性与纯γ-Bi2MoO6相比提高了6.4倍.

关键词: Cu2O, γ-Bi2MoO6, 表面修饰, 可见光, 亚甲基蓝, 降解

Abstract:

Nanosized cuprous oxide (Cu2O) was used to modify the surface of γ-Bi2MoO6, resulting in highly efficient visible-light-responsive Cu2O/γ-Bi2MoO6 composite photocatalysts. The obtained photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectrum (UV-Vis-DRS) to determine their phase structures, micromorphologies, and light absorption properties. The important role of surface-modified Cu2O in improving the photocatalytic activity of γ-Bi2MoO6 under visible light irradiation was studied using the degradation of methylene blue (MB). The results showed that Cu2O nanoparticles with average size of ~10 nm modified the surface of the γ-Bi2MoO6. The nanoparticles delivered both an obvious red-shift of absorption threshold and intensity of the γ-Bi2MoO6, as well as enhanced separation efficiency of photogenerated carriers, thereby leading to significant enhancement in photocatalytic activity. When the amount of Cu2O was 1.5%, the photocatalytic activity of the Cu2O/γ-Bi2MoO6 composite photocatalyst was 6.4 times higher than that of pristine γ-Bi2MoO6.

Key words: Cu2O, γ-Bi2MoO6, Surface modification, Visible light, Methylene blue, Degradation

MSC2000: 

  • O643.36