Abstract
The layered perovskite, K2La2Ti3O10 was prepared by sol-gel method. Ion-exchange of Cu2+ was prepared to improve the photocatalytic activity of K2La2Ti3O10 for chlorobenzene degradation under simulated solar light irradiation. The original K2La2Ti3O10 and Cu2+/K2La2Ti3O10 were characterized by power X-ray diffraction, UV-visible diffuse reflectance spectroscopy, and specific surface area measurement. The XRD analysis shows that Cu2+ ions is incorporated in place of K+ ions and the grain growth is inhibited by ion-exchange. With the rise of calcination temperature, more interlayer Cu2+ was converted into new crystal phase CuO. The degradation ratio reaches 51.1% on Cu2+/K2La2Ti3O10 calcined at 500 °C in air, which is higher 16.9% than the original K2La2Ti3O10. It should be ascribed to the narrow interlayer distance, the formation of CuO, smaller grain size, and the high visible light absorption on the surface of Cu2+/K2La2Ti3O10 calcined at 500 °C. It is found that the exposure of CO2 could promote the photocatalytic activity of Cu2+/K2La2Ti3O10. It also suggests that CO2 is involved in the reduction to form benzaldehyde during decomposition of chlorobenzene.
Highlights
Volatile organic compounds (VOCs) were found to be toxic, malodorous, carcinogenic, mutagenic, and teratogenic to human health [1]
Benzaldehyde has been known to be formed from the photocatalytic degradation of chlorobenzene, which reacted with formaldehyde formed earlier [1]
With the increase of calcination temperature, the degradation ratio increase and reach the maximum at 500 ◦ C. It results from the high visible light absorption on the surface of Cu2+ /K2 La2 Ti3 O10 calcined at 500 ◦ C (Figure 2), except for narrow interlayer distance and the formation of CuO
Summary
Volatile organic compounds (VOCs) were found to be toxic, malodorous, carcinogenic, mutagenic, and teratogenic to human health [1]. The higher photocatalytic activity of the perovskites were ascribed to its specific layered structure. They use the interlayer space as reactions sites to separate the electron–hole pairs [6]. Benzaldehyde has degradation been knownoftochlorobenzene, be formed from the photocatalytic chlorobenzene, which reacted with formaldehyde formed earlier [1]. Benzaldehyde has been known to be formed from the photocatalytic degradation of chlorobenzene, which reacted with formaldehyde formed earlier [1]. CO2 degradation could be converted to formaldehyde by the photo reduction on photocatalyst. Hand, gaseous CO2 could be converted to formaldehyde by the photo reduction on photocatalyst. Ofwe think that CO2 may improve the separation of electron-hole pairs and degradation of chlorobenzene.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
