▎ 摘　　要

NOVELTY - Preparing oxidized graphene composite material involves mixing 2g graphite powder with 25g concentrated sulfuric acid, 2.5g potassium persulfate and 2.5g phosphorus pentoxide at 80 degrees C for 3 hours to obtain mixture. The obtained mixture is added with 500ml water, and then filtered to remove excess acid. The filtrate is dried at room temperature for overnight, and added with 100ml concentrated sulfuric acid. The mixture is added with 13g potassium permanganate, and placed in ice-water bath. The mixture is stirred at 35 degrees C for 30 minutes, and then reacted at 85 degrees C for 2 hours. USE - Method for preparing oxidized graphene composite material used as drug carrier (claimed). ADVANTAGE - The method enables to prepare oxidized graphene composite material, which has excellent fluorescent property and large specific surface area. DETAILED DESCRIPTION - Preparing oxidized graphene composite material involves mixing 2g graphite powder with 25g concentrated sulfuric acid, 2.5g potassium persulfate and 2.5g phosphorus pentoxide at 80 degrees C for 3 hours to obtain mixture. The obtained mixture is added with 500ml water, and then filtered to remove excess acid. The filtrate is dried at room temperature for overnight, and added with 100ml concentrated sulfuric acid. The mixture is added with 13g potassium permanganate, and placed in ice-water bath. The mixture is stirred at 35 degrees C for 30 minutes, and then reacted at 85 degrees C for 2 hours. The mixture is diluted with water under stirring for 1 hour. The obtained mixture is added with 500ml water and 20ml of 30 wt.% hydrogen peroxide solution. The obtained mixture is filtered to obtain filtrate. The obtained filtrate is washed with diluted hydrochloric acid in ratio of 1:10 to obtain neutral mixture. The neutral mixture is dialyzed for one week. The dialyzed mixture is sonicated for 30 minutes at room temperature, and added with 50ml graphene oxide dispersion, 1mg 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 0.5mg N-hydroxysuccinimide under stirring for 30 minutes to activate carboxyl groups. Mesoporous iron(II,III) oxide magnetic nanoparticles are prepared by dissolving 0.02mol iron(III) nitrate in 25ml ethylene glycol at room temperature under stirring for 3 hours to obtain dispersion. The obtained dispersion is heated at 80 degrees C, and added with 1g glycol gel to obtain mixture. The obtained mixture is placed in horizontal tube furnace at 400 degrees C for 12 hours at 10 degrees C/minute heating rate. The obtained mixture is naturally cooled to room temperature, and then washed with pure water and alcohol. The mixture is dried at 70 degrees C for 12 hours to obtain dried product. The dried product is added with trimethylamine. The obtained product is dispersed in 10ml deionized water to obtain mesoporous iron(II,III) oxide magnetic nanoparticles. Zinc oxide quantum dots are prepared by mixing 0.002mol zinc acetate and 0.003 mol lithium hydroxido in 40ml triethylene glycol at room temperature to obtain the 10 mmol/l zinc oxide quantum dots. The obtained graphene oxide mixture is mixed with obtained mesoporous iron(II,III) oxide magnetic nanoparticles and zinc oxide quantum dots to obtain the composite material.