Preparation and Visible-light Photocatalytic Properties of N-S Co-doped CN/NS-TiO2 Nanocomposites

The traditional photocatalyst TiO2 exhibits a poor catalytic effect owing to its wide band gap and very low visible-light-absorption rate. Therefore,to enable its practical application,it is necessary to modify the properties of TiO2 and improve its photocatalytic performance. In this study,we prepared rectangular TiO2 nanosheets with a narrow band gap via hydrofluoric acid etching and nitrogen and sulfur doping to obtain NS-TiO2 and expand its visible-light-response range. NS-TiO2 and g-C3N4(CN)were successfully combined to form the compound catalyst CN/ NS-TiO2,which possesses a heterojunction structure. The formation of CN/ NS-TiO2 heterojunction structures improves the efficiency of the generation and separation of visible-light-generated electron-hole pairs and facilitates the rapid transfer of charge carriers. CN/ NS-TiO2 exhibits excellent photocatalytic properties for the degradation of rhodamine B under visible light irradiation and excellent stability,and its catalytic activity is 5. 06 and 2. 03 times as much as TiO2 and NS-TiO2,respectively. The structure,morphology,chemical composition,and optical properties of CN/ NS-TiO2 were characterized by various analytical methods,which suggested possible photocatalytic enhancement mechanisms and provided new insights into the extensive synthesis of TiO2 matrix composites with improved photocatalytic properties. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.