Double Z-scheme FeVO4/Bi4O5Br2/BiOBr ternary heterojunction photocatalyst for simultaneous photocatalytic removal of hexavalent chromium and rhodamine B

Fabrication of the heterojunction photocatalyst with appropriate band potentials as a promising method inhibiting electron-hole pair recombination leading to enhanced photocatalytic properties. Herein, BiOBr, Bi 4 O 5 Br 2 , and binary BiOBr/Bi composite were selectively synthesized by employing one-step microwave irradiation method. Then, double Z-scheme FeVO /Bi /BiOBr ternary composites different weight percentages (%wt) fabricated their applications studied. The photodegradation organic compounds (rhodamine B (RhB), methylene blue (MB) salicylic acid (SA)), along photoreduction hexavalent chromium (Cr(VI)) investigated. Comparing single photocatalysts, commercial TiO 1 %wt-FeVO demonstrated superior visible-light-driven performance. In Cr(VI)/RhB combined system, Cr(VI) was further improved coexisting RhB molecules simultaneously degraded. Removal maximized adjusting both pH values catalyst dosages. Based on UV–vis diffuse reflectance spectroscopy, photoluminescence electrochemical investigations, active-species trapping, nitrotetrazolium transformation, silver photo-deposition experiments, charge transfer mechanism an RhB-sensitized effect proposed. This special has led significant enhancement in segregation migration, higher redox properties composite, which responsible for excellent activity.