▎ 摘　　要

NOVELTY - Multifunctional micro-nanocomposite material structure, comprises graphene oxide, silver phosphate and phosphorus (P25) composite, where average particle size of P25 is 20-30 nm deposited on the silver phosphate having particle size of 200-400 nm, and silver phosphate and P25 particles are deposited on the surface of the graphene oxide layers. USE - The multifunctional micro-nanocomposite material structure is useful for performing photocatalysis degradation effect on organic dyestuff rhodamine B activated by visible light, and killing common bacteria chosen from Escherichia coli, Staphylococcus aureus, Bacillus pumilus, and Pseudomonas aeruginosa (claimed). ADVANTAGE - The multifunctional micro-nanocomposite material structure has broad-spectrum bacteriostatic effect and excellent absorbency of 0.4 or more than ultraviolet at 200-800 nm, eliminates bacteria within 8 minutes, and exhibits minimum bacterial inhibitory concentration of not greater than 200 parts per million (ppm), preferably not greater than 400 parts per million, inhibition zone of diameter of 10-20 mm, degradation rate of 80% for 5 ppm rhodamine B within 2 minutes, and 100% for rhodamine B within 8 minutes. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing the multifunctional micro-nanocomposite material structure, which involves (a) dissolving graphene oxide in deionized water to obtain ultrasound graphene oxide dispersion, (b) dissolving silver nitrate in deionized water to obtain silver nitrate solution, stirring the mixture using magnetic stirrer, dispersing the graphene oxide and slowly stirring the mixture to obtain precursor solution A, (c) slowly adding aqueous ammonia solution A to the precursor mixture and continuously stirring the mixture to obtain mixed precursor solution B, where the precursor mixture solution B comprises 0.48 wt.% silver nitrate solution, 0.01-0.15 wt.% graphene oxide, and 0.056 mol/l ammonia, (d) dissolving 0.15 mol/l disodium hydrogen phosphate in deionized water, (e) magnetically stirring the mixture, slowly adding disodium hydrogen phosphate solution to the obtained precursor solution B in a dropwise manner until the solution attains brown color turbidity, and slowly stirring the mixture to obtain precursor solution C, and (f) dissolving the 0.1-0.3 wt.% P25 in deionized water by ultrasonic dispersion, magnetically stirring the mixture in a dropwise manner to obtain brown colored solution, mixing the P25 and graphene oxide in a mass ratio of 0.15-4.5:1, continuously stirring the mixture for 30-60 minutes, subjecting the stirred mixture to suction filtration with ethanol and deionized water, and washing and vacuum drying the filtrate.