Study of Ozone Elimination via Chlorine Radical Chain Reaction Under Visible Light
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 perfor-mance,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.
万方数据
维普
