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Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (1): 11-14.

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Low Melting Point and High Stability Polyoxomolybdate-based Ionic Liquids as Photocatalysts

DONG Tao1,2, CHEN Fa-wang1, CAO Min-hua1* and HU Chang-wen1*   

  1. 1. Department of Chemistry, Institute for Chemical Physics, Beijing Institute of Technology, Beijing 100081, P. R. China;
    2. School of Material Engineering, Jinling Institute of Technology, Nanjing 211169, P. R. China
  • Received:2010-05-26 Revised:2010-08-13 Online:2011-01-25 Published:2011-01-04
  • Contact: CAO Min-hua and HU Chang-wen E-mail:caomh@bit.edu.cn; cwhu@bit.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.20731002, 10876002), the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.200800070015), the Program of Cooperation of the Beijing Education Commission, China(No.20091739006), the Program of Cooperation of the Beijing Technology Commission, China(No. Z09010300820902) and the Program for New Century Excellent Talents in University of China.

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Abstract: The polyoxometalate-imidazole ionic liquids(POM-ILs) with low melting points at 94.5 and 95.5 °C, [Cnmim]4[Mo8O26](Cnmim=1-alkyl-3-methylimidazolium, n=12,14), have been successfully synthesized and characterized by DSC, single-crystal X-ray diffraction and TGA, etc. The two POM-ILs have relatively high stability with decomposing temperature up to about 347 and 344 °C, respectively. Further photocatalytic performance was mea- sured via the degradation of rhodamine B(RB) in aqueous solution. The experiments show that the conversion reached to 90% after 90 min under UV-light and the degradation efficiency depended on pH value, different dosages and so on. In addition, the catalysts can be recycled for several times without significant loss of activity.

Key words: Polyoxometalate, Ionic liquid, 1-Alkyl-3-methylimidazolium, Photocatalytic activity