3D/2D direct Z -scheme photocatalyst Zn2SnO4/CdS for simultaneous removal of Cr(VI) and organic pollutant

Zn2SnO4/CdS was prepared by hydrothermal method and chemical bath deposition process. A series of detections were used to characterize the photoelectric properties of the photocatalyst, the results show that the composite of Zn2SnO4 and CdS not only broadens the visible light response range of Zn2SnO4, but also reduces the recombination rate of photogenerated electron-hole pairs. Significantly, direct Z-scheme heterostructure of Zn2SnO4/CdS is corroborated by free radical detection and XPS measurement. Meanwhile, direct Z-scheme heterostructure can effectively avoid the photocorrosion of CdS. Zn2SnO4/CdS simultaneously removed methyl orange (MO) and Cr(VI) under illumination, which is due to the extended visible light response and direct Z-scheme heterostructure. This study provides a reference for the construction of direct Z-scheme photocatalyst for degradation of Cr(VI) and organic pollutant.