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Acta Phys. -Chim. Sin.  2011, Vol. 27 Issue (10): 2411-2415    DOI: 10.3866/PKU.WHXB20110937
Visible Light Induced Photocatalytic Activity of ZnCo2O4 Nanoparticles
CUI Bai1, LIN Hong2, ZHAO Xiao-Chong2, LI Jian-Bao2, LI Wen-Di3
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
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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 wordsPhotocatalysis      Nanostructure      Spinel oxide      Band structure      ZnCo2O4     
Received: 25 April 2011      Published: 08 August 2011
MSC2000:  O643  

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).

Corresponding Authors: LIN Hong     E-mail:
Cite this article:

CUI Bai, LIN Hong, ZHAO Xiao-Chong, LI Jian-Bao, LI Wen-Di. Visible Light Induced Photocatalytic Activity of ZnCo2O4 Nanoparticles. Acta Phys. -Chim. Sin., 2011, 27(10): 2411-2415.

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