▎ 摘　　要

NOVELTY - Method for preparing graphene functionalized magnetic silica, involves (i) adding ferroferric oxide nanoparticles to ethanol solvent, ultrasonically stirring, adding ethyl orthosilicate and aqueous ammonia, continuously ultrasonically stirring and reacting, washing with acetone and drying to obtain magnetic silica nanoparticles, (ii) adding magnetic silica nanoparticles and 3-aminopropyltrimethylsilane to anhydrous toluene solvent, heating and refluxing, cooling, filtering, and washing with dichloromethane and drying to obtain amino functionalized magnetic silica solid powder, and (iii) adding graphene oxide to N,N-dimethylformamide solvent, ultrasonically uniformly dispersing, adding 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride condensing agent and N-hydroxysuccinimide, stirring and reacting at room temperature, adding the amino functionalized magnetic silica obtained in step (ii), continuously stirring and reacting. USE - The method is useful for preparing graphene functionalized magnetic silica for water treatment (claimed) and as efficient adsorbent in sewage treatment. ADVANTAGE - The graphene functionalized magnetic silica can effectively adsorb pollutants in water, and can be recycled. DETAILED DESCRIPTION - Method for preparing graphene functionalized magnetic silica, involves (i) adding ferroferric oxide nanoparticles to ethanol solvent, ultrasonically stirring for 1-2 hours, adding ethyl orthosilicate and aqueous ammonia, continuously ultrasonically stirring and reacting for 5-6 hours, washing with acetone and drying to obtain magnetic silica nanoparticles, where the ratio of the ferroferric oxide nanoparticles and ethyl orthosilicate is 1 g:(15-35) ml, (ii) adding magnetic silica nanoparticles and 3-aminopropyltrimethylsilane to anhydrous toluene solvent, heating and refluxing for 72 hours, cooling, filtering, and washing with dichloromethane and drying to obtain amino functionalized magnetic silica solid powder, where the ratio of the magnetic silica and 3-aminopropyltrimethylsilane is 1 g:(5-8) ml, and the ratio of magnetic silica and toluene solvent is 1 g:30 ml, and (iii) adding graphene oxide to N,N-dimethylformamide solvent, ultrasonically uniformly dispersing, adding 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride condensing agent and N-hydroxysuccinimide, stirring and reacting at room temperature for 2-3 hours, adding the amino functionalized magnetic silica obtained in step (ii), continuously stirring and reacting for 24-48 hours to obtain graphene functionalized magnetic silica, where the ratio of the graphene oxide and N,N-dimethylformamide is 10 mg:(1-2) ml, the mass ratio of graphene oxide and 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and N-hydroxysuccinimide is 1:(5-10):(3-5), and the mass ratio of graphene oxide and amino functionalized magnetic silica is 1:(3-6). An INDEPENDENT CLAIM is included for the use of the graphene functionalized magnetic silica for water treatment, which involves adding graphene functionalized magnetic silica to an aqueous solution containing organic pollutants, oscillating for 20-30 minutes, making the organic pollutants and graphene functionalized magnetic silica to reach adsorption-desorption equilibrium, performing magnetic separation, and adsorbing and removing the organic pollutants in water.