▎ 摘　　要

NOVELTY - Multifunctional heterostructure composite material comprises graphene, silver phosphate and titanium dioxide material, where the structure is controlled using aqueous ammonia. In the composite material the average size of the titanium dioxide nanoparticle is 8-12 nm. The titanium dioxide nanoparticles are covered on the silver phosphate cube surface of particle size 360-480 nm. The titanium dioxide particle and silver phosphate cube are deposited on the graphene sheet surface. USE - Used as a multifunctional heterostructure composite material. ADVANTAGE - The composite material: has good absorption at the wave length of 200-800 nm, and the absorbance is more than 0.8; has good adsorption effect to the organic pollutants; has photocatalytic degradation rate of organic dye rhodamine B (5 parts per million (ppm)) solution under visible light excitation for 1 minute is more than 80% and ensures complete degradation for 6 minutes; and ensures broad-spectrum inhibiting and killing effects on colon Bacillus, Staphylococcus aureus, Bacillus pumilus and Pseudomonas aeruginosa, where the inhibition zone diameter is greater than or equal to 15 mm, the minimum inhibitory concentration is less than or equal to 50 ppm, and the minimum bactericidal concentration is less than or equal to 100 ppm (claimed). DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the multifunctional heterostructure composite material, comprising (i) dissolving graphene oxide in deionized water and dispersing ultrasonically to obtain graphene oxide dispersion liquid; (ii) dissolving the silver nitrate in deionized water to obtain silver nitrate solution, dropping to the graphene oxide dispersion liquid under magnetic stirring, and stirring uniformly to obtaining mixed solution A; (iii) preparing 0.15 mol/l aqueous ammonia, dropping to the mixed solution A under magnetic stirring, and stirring uniformly to obtain the mixed solution B, where the concentration of the graphene oxide in the mixed solution B is 0.01-0.15 wt.%, silver nitrate is 0.48 wt.%, and the concentration of the aqueous ammonia is 0.056 mol/l; (iv) dissolving disodium hydrogen phosphate in deionized water to obtain disodium hydrogen phosphate solution of concentration 0.15 mol/l, dropping disodium hydrogen phosphate solution to the mixed solution to form green turbid reaction system, and stirring uniformly to obtain the mixed system C; and (v) ultrasonically dispersing P25 (titanium dioxide) in deionized water to obtain P25 dispersion liquid of concentration 0.1-0.3 wt.%, then dropping into the mixed system C under magnetic stirring, where the mass ratio of P25 and graphene oxide in the mixed solution after dropping is 0.5-5:1, continuously stirring the mixed solution for 30-60 minutes, then introducing to the polytetrafluoroethylene inner container, sealing the mixed solution containing polytetrafluoroethylene inner container in a stainless steel hydrothermal reaction kettle, carrying out hydrothermal reaction at 160-200 degrees C for 16-24 hours, naturally cooling the reaction kettle to the room temperature, centrifuging the obtained product and respectively washing for many times with deionized water and absolute ethyl alcohol, and vacuum drying.