Effect Of Cu Modified Tio2 Catalysts Prepared By Incipient Wetness Impregnation And Sputtering For Photocatalytic Co2 Reduction In Aqueous Solution

Abstract

In this work, we investigated the photocatalytic CO2 reduction in aqueous solution and were carried out in a stirred slurry reactor using Cu/TiO2 catalysts synthesized by incipient wetness impregnation and sputtering method. Effects of Cu loading onto titania support enhancing efficiency of the photocatalytic CO2 reduction in aqueous solution under UV irradiation by a band gap energy modification appeared between valence band and conduction band are narrowed. Cu assisted a selective hydrocarbon compound, this is methane. A comparison between Cu/TiO2 catalysts synthesized by incipient wetness impregnation and sputtering method showed that both methods exhibited similar methane selectivity. Sputtered catalysts are likely to increase methane production when increasing the Cu deposition content onto titania support. While impregnated catalysts are likely to decrease methane production when increasing the Cu loading content. In summary, the synthesis by sputtering method exhibited the best catalytic performance. The sputtered catalysts, increasing the Cu deposition content, the band gap energy slightly decreased, it enhanced the photocatalytic activity. While impregnated catalysts, increasing the Cu loading content, the band gap energy more decreased, limitation of tiny narrow increased electron-hole recombination, the efficiency of the reaction is decreased.