▎ 摘　　要

NOVELTY - Complex aerogel microsphere comprises hydroxyapatite and graphene oxide in a mass ratio of 1:0.1-1:10, where the hydroxyapatite comprises calcium nitrate tetrahydrate and diammonium phosphate in a molar ratio of 1.17-2.17. USE - Used as complex aerogel microsphere. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the complex aerogel microspheres, comprising (i) preparing graphite oxide using natural graphite by chemical oxidation method, where the chemical oxidation method is a Brodie oxidation method, a Staudemaier oxidation method, a Hummer method or a modified Hummer method, (ii) mixing 100 pts. wt. deionized water and 0.05-5 pts. wt. graphite oxide uniformly, ultrasonically stripping under 200-400 W for 20-60 minutes to obtain an 0.1-20 mg/ml aqueous dispersion of graphene oxide, (iii) (a) using calcium nitrate tetrahydrate, diammonium phosphate and zinc nitrate hexahydrate as precursors of calcium ion, phosphate ion and zinc ion, dissolving in 0.1-5 mol/l calcium nitrate tetrahydrate solution, 0.1-5 mol/l diammonium phosphate solution and 0.1-5 mol/l zinc nitrate hexahydrate solution in distilled water, (b) adding the calcium nitrate tetrahydrate solution to the graphene oxide dispersion obtained in the step (ii) and stirring at 100-1000 revolutions/minute, (c) adding the diammonium phosphate solution to the obtained product of step (b), where the molar ratio of Ca2+ to PO43- is maintained between 1.17 and 2.17 and the mass ratio of hydroxyapatite to graphene oxide in the solution is 1:0.1-1:10, adding aqueous ammonia water into the solution to make the pH to greater than or equal to 11, and stirring at 40 degrees C for 1-24 hours to obtain a uniform hydroxyapatite/graphene oxide complex dispersion system, (iv) atomizing the hydroxyapatite/graphene oxide complex dispersion system obtained in the step (iii) into hydroxyapatite/graphene oxide droplet microspheres by a spray method, and forming hydroxyphosphorus in the cooling bath receiving liquid to obtain a limestone/graphene oxide complex ice microsphere, where the spray method is a pressure spray, an ultrasonic spray or an electrostatic spray and (v) filtering the complex ice microspheres obtained in the step (iv) through a sieve of 100-300 mesh and freeze-drying the residual ice microspheres.