Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (10): 1672-1682.DOI: 10.1016/S1872-2067(18)63115-8

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Effect of high-voltage discharge non-thermal plasma on g-C3N4in a plasma-photocatalyst system

Xiaoping Wang, Yixia Chen, Min Fu, Zihan Chen, Qiulin Huang   

  1. College of Environment and Resources, Chongqing Key Laboratory of Catalysis and Environmental New Material, Chongqing Technology and Business University, Chongqing 400067, China
  • Received:2018-04-15 Revised:2018-05-26 Online:2018-10-18 Published:2018-08-03
  • Contact: 10.1016/S1872-2067(18)63115-8
  • Supported by:

    This work was supported by National Natural Science Foundation of China (21406022), Chongqing Science and Technology Commission (cstc2015jcyjA20017, cstc2017shmsA20015, cstc2016shmszx20012), Chongqing Education Commission (Kj1500610), and Key Laboratory of Natural Medicine Research of Chongqing (1556034).

Abstract:

The synergistic effect of high voltage discharge non-thermal plasma (NTP) and photocatalysts on contaminant removal has repeatedly confirmed by plenty of researches. Most previous plasma-photocatalyst synergistic systems focused on the utilization of the ultraviolet light but ignored the visible light generated by high voltage discharge. Graphitic carbon nitride (g-C3N4), a metal-free semiconductor that exhibits high chemical stability, can utilize both the ultraviolet and visible light from high voltage discharge. However, the synergistic system of NTP and g-C3N4 has been researched little. In this paper, the effect of NTP generated by dielectric barrier discharge (DBD) on g-C3N4is studied by comparing the photocatalytic activities, the surface physical structure and the surface chemical characteristics of pristine and plasma treated g-C3N4. Experimental results indicate that the DBD plasma can change the physical structure and the chemical characteristics and to further affect the photocatalytic activity of g-C3N4. The effect of NTP on g-C3N4is associated with the discharge intensity and the discharge time. For a long time scale, the effect of NTP on g-C3N4 photocatalysts presents a periodic change trend.

Key words: g-C3N4, Non-thermal plasma, Photocatalytic activity, Physical structure, Chemical characteristic