Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (12): 2141-2149.DOI: 10.1016/S1872-2067(17)62947-4

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Photocatalytic Cr(VI) reduction and organic-pollutant degradation in a stable 2D coordination polymer

Fu-Xue Wanga, Xiao-Hong Yia, Chong-Chen Wanga, Ji-Guang Dengb   

  1. a Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation/Sino-Dutch R & D Centre for Future Wastewater Treatment Technologies, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
    b Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China
  • Received:2017-10-04 Revised:2017-10-26 Online:2017-12-18 Published:2017-12-29
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51578034), the Beijing Natural Science Foundation & Scientific Research Key Program of Beijing Municipal Commission of Education (KZ201410016018), Beijing Talent Project (2016023), and Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges Under Beijing Municipality (IDHT20170508).

Abstract:

A new coordination polymer, Zn(bpy)L (BUC-21), (H2L=cis-1,3-dibenzyl-2-imidazolidone-4,5-dicarboxylic acid, bpy=4,4'-bipyridine), has been synthesized under hydrothermal conditions, and characterized by single-crystal X-ray analysis, Fourier transform infrared spectroscopy, thermogravimetric analyses, CNH elemental analysis and UV-Vis diffuse reflectance spectroscopy. BUC-21 exhibited an excellent performance for photocatalytic Cr(VI) reduction with a conversion efficiency of 96%, better than that of commercial P25 (39%), under UV light irradiation for 30 min. BUC-21 could also be used to conduct photocatalytic degradation of organic dyes including methylene blue, rhodamine B, methyl orange and reactive red X-3B. Also, the photocatalytic activity of BUC-21 remained high across a wide pH range from 2.0 to 12.0. It is interesting to note, however, that BUC-21 was unable to achieve simultaneous reduction of Cr(VI) and degradation of an organic pollutant in a mixed matrix, which can be attributed to the competition between Cr(VI) and the organic dyes for access to the photo-excited electrons.

Key words: Photocatalysis, Cr(VI) reduction, Organic dyes, Coordination polymers, Degradation