Preparation of ZnTiO3/TiO2 Photocatalyst and Its Mechanism on Photocatalytic Degradation of Organic Pollutants

Abstract

TiO2 is a promising photocatalysis for degradation of organic pollutants due to its innocuity. However, its widespread practical application was hindered by the fast combination speed of photogenerated electron-hole pairs and low quantum efficiency. In this study, we prepared ZnTiO3-TiO2 using the Sol-Gel method to get heterojunctions, which exhibit efficient separation of photogenerated electron-hole pairs. The photocatalytic performances of various ZnTiO3-TiO2 were evaluated by the removal efficiency of Methyl orange. The experimental results showed that the ZnTiO3-TiO2(ZnTiO3:TiO2=0.3), which was calcinated under 600℃, had the best photocatalytic activity under ultraviolet light. The photocatalyst was stable under a wide range of pH (2.5-12.5). The photocurrent and ESR analysis verified the superior photocatalysis of ZnTiO3-TiO2, which was attributed to the efficient separation of electron-hole pairs induced by the heterojunctions.