Fabrication of magnetic dual Z-scheme heterojunction materials for efficient photocatalytic performance: The study of ternary novel MIL-88A(Fe)/BiOBr/SrFe12O19 nanocomposite

• A dual Z-scheme MBSr ternary composite was developed. • The dual Z-scheme heterojunction enhanced visible-light adsorption and the transfer of photoinduced charged carriers. • The photocatalytic performance of MBSr is superior to that of single and binary composites. • Possible photodegradation pathway and mechanism of RhB were proposed. In this study, we synthesized the MBSr (MIL-88A(Fe)/BiOBr/SrFe 12 O 19 ) dual Z-scheme heterojunction via an accessible hydrothermal method and investigated the photocatalytic performance of MBSr composites for Rhodamine B (RhB) and Methylene blue (MB). The MBSr-1% photocatalyst exhibited excellent photocatalytic performance, resulting the degradation rate of RhB reached approximately 96.2% within 60 min, which was higher than that of M88 (34%), BiOBr (89%) and M88/BiOBr-7% (93.7%) composites. And the MBSr-1% could eliminate 90.1% of MB within 90 min, which displayed the best photodegradation efficiency of prepared photocatalysts. The enhanced photocatalytic performance can be ascribed to the formation of dual Z-scheme heterojunction, which enhanced visible-light absorption and facilitated the transfer of photoinduced carriers. The MBSr-1% was proved to have excellent stability and reusability after six-recycling run. Furthermore, the major reactive species were h + , •O 2 − and •OH by radical trapping experiments. Finally, a possible photocatalytic pathway and mechanism of MBSr photocatalysts was proposed.