Mn doping enhances the photocatalytic performance of Bi2Fe4O9 photocatalyst

Bi2Fe4(1-x)Mn4xO9 photocatalyst was prepared by the coprecipitation-hydrothermal method. After doping Mn2+, the photogenerated carrier recombination efficiency of Bi2Fe4O9 was reduced, the electron transfer efficiency was accelerated, and had a good degradation effect for RhB. When Mn2+ doping was 6%, the degradation effect of organic dyes was very good, reaching 82.29%, and the reaction rate constant was 0.00665min−1, which was 2.5 times that of Bi2Fe4O9. The main active component of the dye degradation process was ·OH, which was consistent with that of Bi2Fe4O9.