Synergistic Effect of Charge Separation and Multiple Reactive Oxygen Species Generation on Boosting Photocatalytic Degradation of Fluvastatin by ZnIn 2 S 4 /Bi 2 WO 6 Z-Scheme Heterostructured Photocatalytst.

The application of semiconductor photocatalysts with narrow band gaps is hindered by the rapid recombination of electron-hole pairs and limitation of multiple reactive oxygen species (ROS) synchronous generation. A n-n-type direct Z-scheme heterostructured photocatalyst was constructed based on the staggered band alignment of bismuth tungstate (Bi 2 WO 6 ) and indium zinc sulfide (ZnIn 2 S 4 ) to reveal the synergistic effect of charge separation and multiple ROS synchronous generation on boosting photocatalytic performance. Under irradiation, electrons in the conduction band (CB) of Bi 2 WO 6 and holes in the valence band (VB) of ZnIn 2 S 4 recombined at interface to prolong the lifetime of electrons in the CB of ZnIn 2 S 4 and holes in the VB of Bi 2 WO 6 . Meanwhile, the multiple ROS synchronously generated to oxidize pollutant due to the strong redox ability of electrons of ZnIn 2 S 4 and holes of Bi 2 WO 6 , which was determined by the CB potential of ZnIn 2 S 4 and VB potential of Bi 2 WO 6 . The results provided valuable insights for the application of photocatalysts with a narrow band gap in the field of water pollution control.