Construction of MoSe2/Bi3O4Cl Z-scheme 2D/3D heterojunction for enhanced photocatalytic performance

The construction of Z-scheme heterojunction is an effective strategy to improve photocatalytic performance. First principles density functional theory (DFT) calculates that Bi 3 O 4 Cl and MoSe 2 have crossed band structures. In this work, we successfully constructed MoSe 2 /Bi 3 O 4 Cl 2D/3D Z-scheme heterojunction by solvothermal method. Characterization by DRS, EIS and PL shows that MoSe 2 /Bi 3 O 4 Cl has stronger light absorption, better electrochemical properties, and higher carrier separation efficiency, which indicates the successful construction of heterojunctions. The obtained composites were further used to degrade the dye RhB in wastewater with excellent photocatalytic activity. The photocatalytic apparent rate constant of 1.0 % MoSe 2 /Bi 3 O 4 Cl is 7.82 times that of pure Bi 3 O 4 Cl. In addition, the catalyst has good cyclic stability, and the activity does not attenuate significantly after five cycles. Finally, according to the reaction mechanism of Z-scheme heterojunction, a detailed electron transfer path is proposed. This research provides a new inspiration for designing complex catalyst heterojunctions for the treatment of dyes in wastewater.