▎ 摘　　要

NOVELTY - Preparing graphene/titanium dioxide/nano-silver composite material comprises e.g. (1) dispersing the graphene oxide in the solvent to obtain the graphene oxide dispersion liquid, dropping aqueous ammonia into the graphene oxide dispersion liquid to obtain the graphene oxide alkali solution, (2) dissolving the butyl titanate into the organic solvent, the organic solvent is ethanol and 1, 3-propyleneglycol mixed solution to obtain titanate solution; and (3) adding butyl titanate solution to oxidized graphene into alkaline solution, stirring, separating, drying, and annealing in air atmosphere. USE - The method is useful for preparing graphene/titanium dioxide/nano-silver composite material. ADVANTAGE - The method can produces composite material with excellent antibacterial property, has simple operation and high efficiency, is economic and easy to realize large-scale industrial production and wide use. DETAILED DESCRIPTION - Preparing graphene/titanium dioxide/nano-silver composite material comprises (1) dispersing the graphene oxide in the solvent to obtain the graphene oxide dispersion liquid, dropping aqueous ammonia into the graphene oxide dispersion liquid to obtain the graphene oxide alkali solution, (2) dissolving the butyl titanate into the organic solvent, the organic solvent is ethanol and 1, 3-propyleneglycol mixed solution to obtain titanate solution; (3) adding butyl titanate solution to the oxidized graphene into alkaline solution, stirring, separating, drying, and annealing in air atmosphere to obtain oxidized graphene/titanium dioxide composite material, (4) using the oxidized graphene/titanium dioxide composite material, dispersing in the solvent, adding silver nitrate solution, stirring to obtain intermediate; the silver nitrate and the oxidized graphene/titanium dioxide composite material with mass ratio of (0.08-0.12):1, and (5) adding the intermediate to carry out ultrasonic treatment, cleaning, then performing optical processing at illumination intensity of 90-120 mW/cm2, and illuminating for 1-4 hours to obtain the graphene/titanium dioxide/nano-silver composite material.