▎ 摘　　要

NOVELTY - Preparation of graphene nanomaterial involves stirring hexane solution of silica, Triton X-100 (RTM: hydrophilic polyethylene oxide) and n-hexanol, then adding iron oxide nanoparticles solution and zinc oxide quantum dot solution, stirring, then adding ammonium hydroxide and poly(diallyldimethylammonium chloride), stirring, adding acetone, ammonium persulfate and (3-trihydroxysilyl)propylmethylphosphonate and obtaining mesoporous iron oxide-zinc oxide quantum dots-silica composite nanoparticles, and adding composite nanoparticles in carboxyl group-activated dispersion. USE - Preparation of graphene nanomaterial used as drug carrier and tracer line. ADVANTAGE - The method efficiently and economically provides graphene oxide having excellent magnetic properties. DETAILED DESCRIPTION - Preparation of graphene nano involves adding 2 g graphite powder to a mixed solution of 25 g concentrated sulfuric acid, then adding 2.5 g potassium sulfate and 2.5 g phosphorus pentoxide, reacting at 80 degrees C for 3 hours, diluting with 500 ml water, filtering to remove excess acid, drying pre-product at room temperature overnight, then adding to 100 ml concentrated sulfuric acid, dripping 13 g potassium permanganate under protection of ice-water bath, stirring mixture at 35 degrees C for 30 minutes and reacting at 85 degrees C for 2 hours, diluting with water, boiling for 30 minutes, stirring for an additional hour, adding 500 ml water and 20 ml 30% hydrogen peroxide solution, filtering mixture and washing 5 times with 1:10 dilute hydrochloric acid, dialyzing product for one week to purify the remaining metal ions, ultrasonically-peeling graphite oxide at room temperature for 30 minutes, adjusting concentration of stock solution to 0.1 mg/ml, adding 2 mg 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and 0.1 mg N-hydroxysuccinimide to 50 ml oxidized graphene dispersion, stirring for 30 minutes and obtaining graphene oxide, dissolving 0.02 mol iron nitrate nonahydrate in 25 ml ethylene glycol at room temperature, stirring for 3 hours, heating mixture to 80 degrees C and forming dry gel, adding 1 g gel in horizontal tube furnace, heating at 400 degrees C for 12 hours at a heating rate of 10 degrees C/minute, naturally-cooling to room temperature, washing product with pure water and alcohol, respectively, and drying at 70 degrees C in oven for 12 hours, trimethyl aluminum to the dried product, ultrasonically-treating for 1 minute, dispersing in 10 ml deionized water and obtaining 10 mmol/L or less mesoporous iron oxide nanoparticles, dissolving 0.002 mol zinc acetate dihydrate and 0.003 mol lithium hydroxide in 40 ml triethyl gallium, stirring, then adding 0.0001 mol magnesium acetate tetrahydrate, ultrasonically-treating in ice-water bath for 5 minutes, purifying and obtaining 10 mmol/l zinc oxide quantum dots, adding 15 ml hexane solution of silica, 3.6 ml Triton X-100 (RTM: hydrophilic polyethylene oxide)and 3.6 ml n-hexanol to a beaker, stirring for 15 minutes, then adding 200 mu l 10 mmol/l iron oxide nanoparticles solution and 800 mu l 10 mmol/l zinc oxide quantum dot solution, stirring for 10 minutes, then adding 120 mu l ammonium hydroxide and 120 mu l poly(diallyldimethylammonium chloride) solution, stirring for 20 minutes, adding 20 ml acetone, 30 mu l ammonium persulfate and 80 mu l (3-trihydroxysilyl)propylmethylphosphonate into the prepared composite nanoparticles, stirring for 24 hours and obtaining mesoporous iron oxide-zinc oxide quantum dots-silica composite nanoparticles, adding 20 ml composite nanoparticles in 50 ml 0.1 mg/ml carboxyl group-activated dispersion for 2 hours, washing and magnetically-separating.