▎ 摘　　要

NOVELTY - Preparation of three-layer spherical shell biological composite material includes dissolving ferric chloride hexahydrate, ferrous chloride tetrahydrate and sodium chloride in deionized water, slowly covering with a layer of oil film, adding sodium hydroxide solution, stirring, separating nanoparticles, washing, centrifuging, sampling, and freeze-drying samples to obtain nanoiron tetroxide; and mixing graphene oxide solution, ammonia water, deionized water and titanium sulfonate nonahydrate, stirring, dispersing, transferring to reactor, heating, cooling, and centrifuging, and washing. USE - Method for preparation of three-layer spherical shell biological composite material (claimed). ADVANTAGE - The product is cheap, highly competitive photocatalyst and environment-friendly, can carry out photocatalytic reaction in a designated area under the control of magnetic field, can be recovered and recycled, can be suspended on water surface, and has effective photocatalytic degradation of wastewater complex organic components, and efficient adsorption of organic pollutants in wastewater. DETAILED DESCRIPTION - Preparation of three-layer spherical shell biological composite material comprises: (A) dissolving ferric chloride hexahydrate, ferrous chloride tetrahydrate and sodium chloride in deionized water, slowly covering with a layer of oil film, slowly adding sodium hydroxide solution, magnetically stirring, separating nanoparticles, washing with deionized water, centrifuging, sampling, freeze-drying samples, and packaging to obtain nanoiron tetroxide; (B) mixing graphene oxide solution, ammonia water, deionized water and titanium sulfonate nonahydrate, magnetically stirring, ultrasonically dispersing, transferring to reactor, oven-heating, cooling to room temperature, centrifuging, washing, and ultrasonically dispersing in water to obtain nitrogen-doped graphene composite material; and (C) adding fungal mycelium and culture medium solution into reactor, shaking to carry out culturing, adding nanoiron tetroxide, ultrasonically dispersing, shaking to carry out culturing, transferring to new culture medium, adding step (B) product, shaking to carry out culturing, taking out, soaking into hydrochloric acid, washing with deionized water until neutralized, freeze-drying, and oven-drying.