▎ 摘　　要

NOVELTY - Composite material comprises graphene oxide material and a fluorescent magnetic composite microsphere material, where the saturated magnetization intensity of fluorescent magnetic composite microsphere and graphene oxide composite material is 10-50 emu/g, graphene oxide composite material has a particle size of 500-600 nm and fluorescent magnetic composite microsphere has a particle size of 50-1000 nm. USE - The composite material is useful in biomedical field. ADVANTAGE - The composite material can be prepared with excellent magnetic property and fluorescent performance in an eco-friendly manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing composite material comprising (a) adding 4 g of hydrated ferric chloride and ferrous chloride according to a molar ratio of 2:1 and then mixing with 30 ml of water, stirring and dissolving under protection of nitrogen at temperature of 2-140 degrees C, adding 5-20 ml of aqueous ammonia to the 10 ml of oleic acid and then reacting at 4-140?OC for 1-60 minutes and cooling to room temperature to adjust a pH value to 0.5 mole/l using hydrochloric acid, washing the cooled mixture by water and ethanol and then magnetically separating to obtain the composite particle, (b) adding 5 g of sodium borohydride and potassium borohydride according to a molar ratio of 0.2-4:1, adding 50 ml of water and then reacting at 50 degrees C for 1-2 hours, mixing the reacted mixture with 0.001 mole/l of cadmium chloride solution and mercapto acetic acid according to a volume ratio of 10000:1 to adjust a pH value to 3-12 using sodium hydroxide solution and then stirring and reacting 1 hour, adding 20 ml of oil acid and then dropping for 5-10 minutes and reacting at 200?ioC for 1-60 minutes and washing by water and ethanol, centrifuging and separating to obtain cadmium sulfide nano particles, (c) adding 2 g of sodium sulfite, and selenium powder according to a molar ratio of 0.5:1 and then mixing with 50 ml of water and then reacting at 120 degrees C for 1-48 hours to obtain 0.01-1 mole/l of solution of sodium selenide, adding 0.001-1 mole/l of aqueous solution of cadmium chloride and mercapto acid according to a volume ratio of 10000:1 and then mixing with 300 ml of water to adjust a pH value to 3-12 and then reacting at 200 degrees C for 1 hour, adding oleic acid and then reacting at room temperature for 10-60 minutes and washing with ethanol, centrifuging the washed mixture, adding 1 g of cadmium and iron oxide according to a ratio of 5:1 and then mixing with 100 ml of toluene and then ultrasonically dispersing for 0.5-5 hours to obtain magnetic fluid, (d) adding distilled water, isopropyl alcohol and aqueous ammonia according to a volume ratio of 1:10:0-1.1 and then mixing with 115 ml of mixed solution and magnetic fluid and then reacting for 1 hour, washing and drying to obtain iron oxide-silicon dioxide, (e) adding 2 g of iron oxide-silicon dioxide and then ultrasonically dispersing in 55 ml of anhydrous toluene, adding the dispersed mixture to silane coupling agent and triethylamine and then reacting for 1 minute to 72 hours, washing with water and ethanol, centrifuging and drying in vacuum to obtain fluorescent magnetic composite microspheres, and (f) adding graphite oxide, sodium chlorate and potassium chlorate according to a mass ratio of 0.1:0.5-5:1 and then mixing with 100 ml of water and then stirring at 100?OC and reacting for 1-72 hours, washing the reacted mixture with water and ethanol and then centrifuging and drying in vacuum, adding 100 ml of water and 550 mg of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride and then mixing with dried mixture and then reacting at 200 degrees C for 1-2 hours and washing with water and ethanol, and centrifugally separating the washed mixture and then vacuum drying.