Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (1): 80-94.DOI: 10.1016/S1872-2067(18)63172-9

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Fast electron transfer and enhanced visible light photocatalytic activity by using poly-o-phenylenediamine modified AgCl/g-C3N4 nanosheets

Linlin Suna, Chongyang Liua, Jinze Lia, Yaju Zhoua, Huiqin Wangb, Pengwei Huoa, Changchang Maa, Yongsheng Yana   

  1. a Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
    b School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
  • Received:2018-07-25 Revised:2018-09-18 Online:2019-01-18 Published:2018-11-09
  • Contact: 10.1016/S1872-2067(18)63172-9
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21576125, 21776117), the China Postdoctoral Science Foundation (2017M611716, 2017M611734), the Six talent peaks project of Jiangsu Province (XCL-014), and the Zhenjiang Science & Technology Program (SH2016012).


Exfoliation of bulk graphitic carbon nitride (g-C3N4) into two-dimensional (2D) nanosheets is one of the effective strategies to improve its photocatalytic properties so that the 2D g-C3N4 nanosheets (CN) have larger specific surface areas and more reaction sites. In addition, poly-o-phenylenediamine (PoPD) can improve the electrical conductivity and photocatalytic activity of semiconductor materials. Here, the novel efficient composite PoPD/AgCl/g-C3N4 nanosheets was first synthesized by a precipitation reaction and the photoinitiated polymerization approach. The obtained photocatalysts have larger specific surface areas and could achieve better visible-light response. However, silver chloride (AgCl) is susceptible to agglomeration and photocorrosion. The PoPD/AgCl/CN composite exhibits an extremely high photocurrent density, which is three times that of CN. Obviously enhanced photocatalytic activities of PoPD/AgCl/g-C3N4 are revealed through the photodegradation of tetracycline. The stability of PoPD/AgCl/CN is demonstrated based on four cycles of experiments that reveal that the degradation rate only decreases slightly. Furthermore,·O2- and h+ are the main active species, which are confirmed through a trapping experiment and ESR spin-trap technique. Therefore, the prepared PoPD/AgCl/CN can be considered as a stable photocatalyst, in which PoPD is added as a charge carrier and acts a photosensitive protective layer on the surface of the AgCl particles. This provides a new technology for preparing highly stable composite photocatalysts that can effectively deal with environmental issues.

Key words: g-C3N4 nanosheets, AgCl, Poly-o-phenylenediamine, Visible light irradiation, Photocatalytic