物理化学学报 >> 2011, Vol. 27 >> Issue (06): 1482-1486.doi: 10.3866/PKU.WHXB20110630

催化和表面科学 上一篇    下一篇

还原氧化石墨烯修饰Bi2WO6提高其在可见光下的光催化性能

应红1,2, 王志永2, 郭政铎2, 施祖进2, 杨上峰1   

  1. 1. 中国科学技术大学材料科学与工程系, 合肥微尺度物质科学国家实验室, 中国科学院能量转换材料重点实验室, 合肥 230026;
    2. 北京大学化学与分子工程学院, 稀土材料化学与应用国家重点实验室, 北京分子科学国家实验室, 北京 100871
  • 收稿日期:2011-01-18 修回日期:2011-03-23 发布日期:2011-05-31
  • 通讯作者: 施祖进, 杨上峰 E-mail:zjshi@pku.edu.cn; sfyang@ustc.edu.cn
  • 基金资助:

    国家自然科学基金(20771010, 20801052), 国家重点基础研究发展规划项目(973) (2011CB932601)国家高技术研究发展计划项目(863)(2007AA03Z311)和中国科学院百人计划(A1010)资助

Reduced Graphene Oxide-Modified Bi2WO6 as an Improved Photocatalyst under Visible Light

YING Hong1,2, WANG Zhi-Yong2, GUO Zheng-Duo2, SHI Zu-Jin2, YANG Shang-Feng1   

  1. 1. Key Laboratory of Materials for Energy Conversion, Chinese Academy of Sciences, Hefei National Laboratory for Physical Sciences at Microscale, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China;
    2. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2011-01-18 Revised:2011-03-23 Published:2011-05-31
  • Contact: SHI Zu-Jin, YANG Shang-Feng E-mail:zjshi@pku.edu.cn; sfyang@ustc.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20771010, 20801052), National Key Basic Research Program of China (973) (2011CB932601), National High Technology Research and Development Program of China (863) (2007AA03Z311), and “100 Talents Program of Chinese Academy of Sciences” (A1010).

摘要:

通过两步水热法合成了一种新型的还原氧化石墨烯(RGO)修饰的Bi2WO6(Bi2WO6-RGO), 结果表明其在可见光下的光催化性能得到了显著的提高. 研究了RGO在Bi2WO6-RGO中的含量对其光催化性能的影响, 从而确定出RGO相对于Bi2WO6的最佳掺杂质量比值为1%. 通过扫描电镜(SEM)研究发现, RGO并没有改变Bi2WO6光催化剂的结构和形貌. Bi2WO6-RGO在可见光下的光催化性能得以提高可以归功于RGO. 其可能的机理是石墨烯的存在有利于光生载流子(激子)的分离, 从而导致产生更多的O2·-用于有机染料污染物(如罗丹明B (RhB))的降解. RhB分子在石墨烯上的有效吸附可能也是导致Bi2WO6-RGO光催化性能提高的另一原因.

关键词: Bi2WO6, 石墨烯, 水热法, 光催化剂, 有机染料污染物

Abstract:

A new and improved photocatalyst, reduced graphene oxide (RGO)-modified Bi2WO6 (Bi2WO6-RGO), was synthesized by a two-step hydrothermal process. The effect of RGO content on photoactivity was investigated and the optimum mass ratio of RGO to Bi2WO6 was determined to be 1%. Based on scanning electron microscopic study, RGO does not change the structure and morphology of the Bi2WO6 photocatalyst. Therefore, the improvement in the photoactivity of the Bi2WO6-RGO composite is undoubtedly ascribed to RGO. The presence of graphene can facilitate the dissociation of photogenerated excitons, which leads to more O2·- to degrade dye pollutants like rhodamine-B (RhB). Moreover, the efficient adsorption of RhB molecules on graphene is another reason for the improved photoactivity.

Key words: Bi2WO6, Graphene, Hydrothermal process, Photocatalyst, Dye pollutant

MSC2000: 

  • O643