▎ 摘　　要

NOVELTY - Preparing precious metal/graphene-supported manganese-zinc-based low-light photocatalyst comprises (a) dissolving noble metal chlorides e.g. platinum or palladium in water, adding graphene flake powder, amide non-ionic surfactant and emulsify, (b) dissolving nitrate or acetate of manganese, zinc and rare earth in water, adding complexing agent, stirring, adding ammonia water to adjust pH value, (c) allowing sol to form a viscous gel state under heating conditions, (d) placing manganese-zinc-rare earth-based weak light photocatalyst precursor into a muffle furnace for low-temperature roasting to prepare manganese-zinc-rare earth-based low-light photocatalyst catalytic material, (e) adding manganese-zinc-rare earth-based low-light photocatalyst catalystic material prepared in step (d) to composite microchip slurry, shearing, stirring and homogenizing at high pressure and (f) freeze-drying precious metal chloride/graphene manganese-zinc-rare earth-based low-light photocatalyst mixture. USE - The method is useful for preparing precious metal/graphene-supported manganese-zinc-based low-light photocatalyst. ADVANTAGE - The photocatalyst: can generate hydroxy free radicals under the action of weak light, which can degrade indoor pollutants non-selectively, and kill bacteria, molds and viruses. DETAILED DESCRIPTION - Preparing precious metal/graphene-supported manganese-zinc-based low-light photocatalyst comprises (a) dissolving noble metal chlorides e.g. platinum or palladium in water, adding graphene flake powder, amide non-ionic surfactant and emulsify, preparing composite microchip slurry with noble metal chlorides uniformly distributed on the surface of the graphene, (b) dissolving nitrate or acetate of manganese, zinc and rare earth in water, adding complexing agent, stirring, adding ammonia water to adjust the pH value, ultrasonically vibrating, heating, thus the metal ions e.g. manganese, zinc and rare earth can be completely complexed with the complexing agent to form a transparent sol, (c) allowing the sol in step (b) to form a viscous gel state under heating conditions, placing into oven for pre-baking and carbonizing to prepare a manganese-zinc-rare earth-based weak light photocatalyst precursor, (d) placing manganese-zinc-rare earth-based weak light photocatalyst precursor obtained in the step (c) into a muffle furnace for low-temperature roasting to prepare manganese-zinc-rare earth-based low-light photocatalyst catalytic material, (e) adding manganese-zinc-rare earth-based low-light photocatalyst catalyst material prepared in step (d) to composite microchip slurry, shearing, stirring and homogenizing at high pressure, adding thixotropic agent to adjust the viscosity to obtain manganese-zinc-rare earth-based weak light photocatalyst mixture with soft agglomeration opened and the surface micro-coated with precious metal chloride/graphene and (f) freeze-drying precious metal chloride/graphene manganese-zinc-rare earth-based low-light photocatalyst mixture prepared in the step (e), heating to 280 degrees C before drying out of the box to obtain precious metal/graphene micro-packages coated with manganese-zinc-rare earth-based low-light photocatalyst powder material.