物理化学学报 >> 2014, Vol. 30 >> Issue (11): 2113-2120.doi: 10.3866/PKU.WHXB201409052

催化和表面科学 上一篇    下一篇

Bi2MoO6/BiVO4异质结的水热合成和可见光催化活性

林雪1, 郭晓宇2, 王庆伟2, 常利民2, 翟宏菊2   

  1. 1. 吉林师范大学环境友好材料制备与应用教育部重点实验室, 吉林 四平 136000;
    2. 吉林师范大学化学学院, 吉林 四平 136000
  • 收稿日期:2014-06-30 修回日期:2014-09-04 发布日期:2014-10-30
  • 通讯作者: 林雪, 王庆伟 E-mail:jlsdlinxue@126.com;wqw611203@163.com
  • 基金资助:

    国家自然科学基金(21407059, 61308095)和吉林省科技发展计划项目(20130522071JH, 20130102004JC, 20140101160JC)资助

Hydrothermal Synthesis and Efficient Visible Light Photocatalytic Activity of Bi2MoO6/BiVO4 Heterojunction

LIN Xue1, GUO Xiao-Yu2, WANG Qing-Wei2, CHANG Li-Min2, ZHAI Hong-Ju2   

  1. 1. Key Laboratory of Preparation and Application Environmentally Friendly Materials, Ministry of Education, Jilin Normal University, Siping 136000, Jilin Province, P. R. China;
    2. College of Chemistry, Jilin Normal University, Siping 136000, Jilin Province, P. R. China
  • Received:2014-06-30 Revised:2014-09-04 Published:2014-10-30
  • Contact: LIN Xue, WANG Qing-Wei E-mail:jlsdlinxue@126.com;wqw611203@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21407059, 61308095) and Science Development Project of Jilin Province, China (20130522071JH, 20130102004JC, 20140101160JC).

摘要:

采用一步水热法制备Bi2MoO6/BiVO4复合光催化剂. 利用X 射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、高分辨透射电子显微镜(HRTEM)等手段对其晶体结构和微观结构进行了表征. 结果表明, Bi2MoO6纳米粒子沉积在BiVO4纳米片表面从而形成异质结结构. 紫外-可见漫反射光谱(UV-Vis DRS)表明所制备的Bi2MoO6/BiVO4异质结较纯相Bi2MoO6和BiVO4对可见光吸收更强. 由于形成异质结结构及其光吸收性能使Bi2MoO6/BiVO4 光催化活性有较大提高. 可见光下(λ>420 nm)光催化降解罗丹明B (RhB)实验结果表明,Bi2MoO6/BiVO4光催化活性较纯相Bi2MoO6和BiVO4高. Bi2MoO6/BiVO4样品光催化性能提高的原因是Bi2MoO6和BiVO4形成异质结, 从而有效抑制光生电子-空穴对的复合, 增大了可见光吸收范围及比表面积.

关键词: Bi2MoO6/BiVO4, 复合材料, 纳米结构, 光催化活性

Abstract:

A Bi2MoO6/BiVO4 photocatalyst with a heterojunction structure was synthesized by a one-pot hydrothermal method. Its crystal structure and microstructure were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). The FESEM and HRTEM images indicated that Bi2MoO6 nanoparticles were loaded on the surface of BiVO4 nanoplates to form a heterojunction. The ultraviolet visible (UV-Vis) diffuse reflection spectra (DRS) showed that the resulting Bi2MoO6/BiVO4 heterojunction possessed more intensive absorption within the visible light range compared with pure Bi2MoO6 and BiVO4. These excellent structural and spectral properties endowed the Bi2MoO6/BiVO4 heterojunction with enhanced photocatalytic activity. It was found that the Rhodamine B (RhB) degradation rate with Bi2MoO6/BiVO4 was higher than that with pure BiVO4 and Bi2MoO6 under visible light (λ>420 nm) by photocatalytic measurements. The enhanced photocatalytic performance of the Bi2MoO6/BiVO4 sample can be attributed to the improved separation efficiency of photogenerated hole-electron pairs generated by the heterojunction between Bi2MoO6 and BiVO4, intensive absorption within the visible light range, and high specific surface area.

Key words: Bi2MoO6/BiVO4, Composite material, Nanostructure, Photocatalytic activity

MSC2000: 

  • O643