▎ 摘　　要

NOVELTY - Method for preparing antibacterial complex material, involves (a) preparing graphene quantum dot suspension by stirring graphene quantum dot suspension, (b) preparing zinc oxide loaded graphene quantum dots, (c) performing surface treatment of zinc oxide loaded graphene quantum dots, (d) preparing silver supported graphene quantum dot, (e) performing ultrasonic dispersion of silver-loaded graphene quantum dots in ethanol, (f) preparing silver/titania graphene quantum dots, (g) adding products obtained in steps (c) and (f), centrifuging mixture, and drying product. USE - The method is useful for preparing antibacterial complex material (claimed). ADVANTAGE - The method prepares antibacterial complex material with improved stability and which provides long-term antibacterial effect, and prevents agglomeration of silver and zinc oxide. DETAILED DESCRIPTION - Method for preparing antibacterial complex material, involves (a) preparing graphene quantum dot suspension by stirring graphene quantum dot suspension at a speed of 100 revolutions/minute and subjecting to laser irradiation at 1-2 W for 30-60 minutes, (b) preparing zinc oxide loaded graphene quantum dots (0.5-1 mg/ml) by ultrasonic stirring 80-100 ml zinc oxide dispersion using water as solvent, and adding product obtained in step (a) in a drop wise manner, performing ultrasonic mixing for 30-60 minutes, centrifuging, washing and drying product, (c) performing surface treatment of zinc oxide loaded graphene quantum dots, (d) preparing silver supported graphene quantum dot by performing ultrasonic mixing other half of the graphene quantum dot suspension, and dropping silver nitrate solution, and reacting at 45-60 degrees C, and adding trisodium citrate, and performing ultrasonic mixing for 60-120 minutes, and washing and drying product, (e) performing ultrasonic dispersion of 0.1-0.5 g silver-loaded graphene quantum dots in ethanol, and adding water and ammonia in a volume ratio of 3-5:1, uniformly mixing mixture and adding ethyl orthosilicate, adjusting pH of the mixture to 9-10, and reacting mixture at 20-25 degrees C for 1-3 hours, centrifuging mixture and washing using acetone and deionized water, and drying product, (f) uniformly mixing 0.1-0.3 mol/l titanium source to 1 mol/l sulfuric acid solution, and reacting at 100-110 degrees C for 2-4 hours and adjusting pH to 7 using concentrated ammonia solution, and aging, washing and drying product, (g) adding 0.005-0.01 g oxidized graphite to 5-10 ml product obtained in step (f), ultrasonic stirring mixture, and adding 0.1-0.3 g silver/titanium dioxide graphene quantum dots, performing ultrasonic stirring for 10-30 minutes, and adding into microwave-assisted hydrothermal synthesis apparatus lined with polytetrafluoroethylene at 200-240 degrees C and microwave power of 200-400 W for 60-90 minutes and cooling, filtering and drying product, and (h) performing ultrasonic stirring 0.2-0.8 mg/ml graphene dispersion solution, and adding products obtained in steps (c) and (g), performing ultrasonic stirring for 10-30 minutes, insulating stirred product at 80-120 degrees C for 15-30 minutes, centrifuging mixture, and washing and drying product.