Volume 8 Issue 1
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Article Navigation >  Green Energy&Environment  > 2023  >  8(1): 194-199
Hongbo Xue, Sen Xiong, Kai Mi, Yong Wang. Visible-light degradation of azo dyes by imine-linked covalent organic frameworks. Green Energy&Environment, 2023, 8(1): 194-199. doi: 10.1016/j.gee.2020.09.010
Citation: Hongbo Xue, Sen Xiong, Kai Mi, Yong Wang. Visible-light degradation of azo dyes by imine-linked covalent organic frameworks. Green Energy&Environment, 2023, 8(1): 194-199. doi: 10.1016/j.gee.2020.09.010
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Visible-light degradation of azo dyes by imine-linked covalent organic frameworks

doi: 10.1016/j.gee.2020.09.010

  • State Key Laboratory of Materials-Oriented Chemical Engineering, And College of Chemical Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China

Funds:

This work was financially supported by the National Science Fund for Distinguished Young Scholars (21825803). We also thank the Program of Excellent Innovation Teams of Jiangsu Higher Education Institutions and the Project of Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

  • Received date 30 June 2020, Accepted date 20 September 2020, RevRecd date 15 August 2020, Publish date 25 March 2021,
    Abstract
  • Covalent organic frameworks (COFs) are nanoporous crystalline polymers with densely conjugated structures. This work discovers that imine-linked COFs exhibit remarkable photodegradation efficiency to azo dyes dissolved in water. Visible light generates different types of radicals from COFs, and superoxide radicals break N＝N bonds in dye molecules, resulting in 100% degradation of azo dyes within 1 h. In contrast, these dyes cannot be degraded by conventionally used photocatalysts, for example, TiO2. Importantly, the COF photocatalysts can be recovered from the dye solutions and re-used to degrade azo dyes for multiple times without loss of degradation efficiency. This work provides an efficient strategy to degrade synthetic dyes, and we expect that COFs with designable structures may use as new photocatalysts for other important applications.

     

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