▎ 摘　　要

NOVELTY - Preparing manganese ferrite magnetic photocatalyst based on multi-component composite system, comprises (1) adding graphene oxide and potassium tetrachloropalladate into water, and carrying ultrasound treatment to obtain the first solution; (2) adding ferric nitrate nonahydrate and manganese acetate tetrahydrate into water, stirring and dissolving to obtain the second solution; and (3) mixing the first solution and the second solution to obtain a mixed solution, adding hydrazine aqueous solution and aqueous ammonia solution to stir, and heating to react; after reaction, cooling to room temperature, and adding ethanol, allowing to stand, separating out precipitate particles, washing and drying to obtain a magnetic photocatalyst. USE - The method is useful for preparing manganese ferrite magnetic photocatalyst based on multi-component composite system. ADVANTAGE - The method: uses manganese ferrite as magnetic nanoparticles, which can make the photocatalyst easy to recycle after degrading and purifying the pollutants, greatly improves the use efficiency, compositely reduces graphene oxide and palladium nanoparticles, improves photocatalytic performance, and further improves degradation efficiency of the photocatalyst.