A novel recyclable magnetic photocatalyst BiOBr/BiOCl/MnxZn1−xFe2O4 was fabricated by the low-cost hydrothermal method. The BiOBr/BiOCl with 10 wt% MnxZn1−xFe2O4 (BCB-10MZF) shows the highest visible photocatalytic efficiency that could degrade 96.3% Rhodamine B (RhB) wastewater. BCB-10MZF has a larger specific area (6.7 m2 g−1) with a narrow band gap (2.79 eV). Moreover, the BCB-10MZF in the external magnetic field can be recycled swiftly because of the high magnetization saturation (2.79 emu g−1). The degradation rate of RhB by BCB-10MZF still reaches 80% after reusing 4 times, verifying that BCB-10MZF has strong stability. During the RhB degradation process, the •O2− and h+ were identified as the dominant active species, and excellent photocatalytic properties of BCB-10MZF owing to the p–n heterojunction formation. This work demonstrates the novel BiOBr/BiOCl/MnxZn1−xFe2O4 is suitable for organic wastewater RhB treatment, and the enhancement mechanism of photocatalysis also offers great reference significance for the synthesis of other MZF-based magnetic semiconductor photocatalysts.Graphical Abstract:
Highlights: A low-cost hydrothermal method synthesized a novel catalyst BiOBr/BiOCl/MnxZn1−xFe2O4.BiOBr/BiOCl/MnxZn1−xFe2O4 exhibits excellent photocatalytic degradation activity.A possible photocatalytic enhancement mechanism is proposed.