Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (9): 20240187.doi: 10.7503/cjcu20240187

• Physical Chemistry • Previous Articles     Next Articles

Study of Ozone Elimination via Chlorine Radical Chain Reaction Under Visible Light

ZHAO Ziwang1, CONG Shurui2, WANG Chunyu1, ZHOU Shuyuan1, PENG Meng3, WANG Lei1(), XU Jiayu3()   

  1. 1.State Key Laboratory of NBC Protection for Civilian,Beijing 102205,China
    2.State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China
    3.School of Environment,Tsinghua University,Beijing 100084,China
  • Received:2024-04-12 Online:2024-09-10 Published:2024-07-15
  • Contact: WANG Lei, XU Jiayu E-mail:wanglei16@tsinghua.org.cn;jiayu_tsinghua@163.com
  • Supported by:
    the Foundation of State Key Laboratory of NBC Protection for Civilian, China(SKLNBC 2022-03)

Abstract:

The concentration of ozone(O3) in our atmosphere has increased, which makes O3 a crucial pollutant in the prevention of air pollution. The photocatalytic reaction based on hydroxyl radical has low ozone elimination performance, and the modification method that only increases the production of hydroxyl radical is not suitable for ozone photocatalytic elimination. In this paper, a series of Fe-Bi2WO6@TiO2 composites were prepared by Fe doping and TiO2 supporting successively based on Bi2WO6. A series of physical properties characterization and ozone catalytic activity tests were carried out for the composites. The results show that Fe-Bi2WO6@TiO2 has a typical coating structure, exhibits visible light response, and stimulates the formation of chlorine radicals. Chlorine radicals act as active species for eliminating O3, driving a photochemical reaction mechanism similar to the "ozone hole effect", that is, the surface chlorinated TiO2 was photoexcited to produce chlorine radicals,triggering a chain reaction,and greatly improving the ozone decomposition performance. The maximum elimination rate of O3 by Fe-Bi2WO6@TiO2 is 93%. The introduction of chlorine radical and the expansion of visible light response of the composite can greatly improve the photocatalytic ozone elimination ability.

Key words: Chlorine radical, Visible light responsive, Photocatalysis, Ozone, Coating structure

CLC Number: 

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