物理化学学报 >> 2011, Vol. 27 >> Issue (10): 2411-2415.doi: 10.3866/PKU.WHXB20110937

催化和表面科学 上一篇    下一篇

ZnCo2O4纳米粒子的可见光催化性能

崔柏1, 林红2, 赵晓冲2, 李建保2, 李文迪3   

  1. 1. 帝国理工学院材料系, 伦敦SW7 2AZ;
    2. 先进陶瓷与精细工艺国家重点实验室, 清华大学材料科学与工程系, 北京 100084;
    3. 北京科技大学材料科学与工程学院, 材料物理与化学系, 北京 100083
  • 收稿日期:2011-04-25 修回日期:2011-07-13 发布日期:2011-09-27
  • 通讯作者: 林红 E-mail:hong-lin@tsinghua.edu.cn
  • 基金资助:

    国家自然科学基金(50572051, 50672041), 国家高技术研究发展计划项目(863) (2006AA03Z218)和国家重点基础研究发展规划项目(973)(2007CB607504)资助

Visible Light Induced Photocatalytic Activity of ZnCo2O4 Nanoparticles

CUI Bai1, LIN Hong2, ZHAO Xiao-Chong2, LI Jian-Bao2, LI Wen-Di3   

  1. 1. Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;
    2. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China;
    3. Department of Material Physics and Chemistry, School of Materials Science and Engineering, University of Science & Technology Beijing, Beijing 100083, P. R. China
  • Received:2011-04-25 Revised:2011-07-13 Published:2011-09-27
  • Contact: LIN Hong E-mail:hong-lin@tsinghua.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50572051, 50672041), National High-Tech Research and Development Program of China (863) (2006AA03Z218), and National Key Basic Research Program of China (973) (2007CB607504).

摘要: 研究了共沉淀分解法制备的ZnCo2O4纳米粒子的光学和可见光催化性能,并对其晶体结构和微观结构用X射线衍射、热重/差热分析、透射电镜和高分辨透射电镜等手段进行了表征. 结果表明, 制备的纳米粒子为纯相的ZnCo2O4, 平均粒径约为10-20 nm. 紫外-可见吸收光谱估计出ZnCo2O4纳米粒子的能带隙为3.39 和2.09 eV. 可见光(λ>420 nm)照射下, 纳米粒子表现出降解亚甲基蓝溶液的光催化活性. ZnCo2O4纳米粒子的光催化活性可以归结为紫外和可见光下纳米粒子吸收光子(能量大于能带隙)的能力, 以及它们的纳米尺寸. 基于实验结果, 本文提出了ZnCo2O4可能的能带结构.

关键词: 光催化, 纳米结构, 尖晶石氧化物, 能带结构, ZnCo2O4

Abstract: ZnCo2O4 nanoparticles were synthesized by a co-precipitation decomposition method and their optical and photocatalytic properties were investigated. Their crystal structure and microstructures were characterized using X-ray diffraction (XRD), thermogravimetry (TG)/differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The ZnCo2O4 nanocrystallites obtained were single-phase with an average size of 10-20 nm. The optical bandgap energies of the nanoparticles were estimated to be 3.39 and 2.09 eV from the UV-Vis absorption spectrum. The ZnCo2O4 nanoparticles exhibited high photocatalytic activity for the degradation of methylene blue dye solution under visible light irradiation (λ>420 nm). The photocatalytic activity of the ZnCo2O4 nanoparticles is attributed to their ability to absorb bandgap photons under UV and visible light as well as their nanoscale particle size. Based on these experimental results, a possible band structure of ZnCo2O4 is proposed.

Key words: Photocatalysis, Nanostructure, Spinel oxide, Band structure, ZnCo2O4

MSC2000: 

  • O643