Fabrication of Z-scheme Bi3O4Cl/g-C3N4 2D/2D heterojunctions with enhanced interfacial charge separation and photocatalytic degradation various organic pollutants activity

Abstract A novel Z-scheme Bi 3 O 4 Cl/g-C 3 N 4 2D/2D heterojunctions were successfully prepared by solid phase calcination method. The Z-scheme Bi 3 O 4 Cl/g-C 3 N 4 2D/2D heterojunctions exhibit outstanding photocatalytic activity for removing the various water contaminant under visible light, such as antibiotic, dye and heavy metal. The enhancement of phototcatalytic performance is ascribed to the interfacial interaction between 2D Bi 3 O 4 Cl nanoflakes and 2D g-C 3 N 4 nanosheets, which can enlarge specific surface area and improve separation efficiency of photogenerated electron-hole pairs. To explain the interfacial interaction between Bi 3 O 4 Cl and g-C 3 N 4 in Z-scheme Bi 3 O 4 Cl/g-C 3 N 4 2D/2D heterojunctions, the transmission electron microscopy, X-ray photoelectron spectroscopy and N 2 adsorption-desorption isotherms measurements were investigated. In addition, the photocatalytic mechanism over Z-scheme Bi 3 O 4 Cl/g-C 3 N 4 2D/2D heterojunction is systematically investigated by the calculation, trapping experimental and ESR technology. The present work may provide a promising approach to fabrication of other Z-scheme 2D/2D heterojunction with efficient photocatalytic activity.