Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (10): 2411-2415.doi: 10.3866/PKU.WHXB20110937

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

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
  • 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).

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


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