▎ 摘　　要

NOVELTY - Preparing nano-composite involves mixing dopamine hydrochloride, graphene oxide and tris(hydroxymethyl)aminomethane in ratio of of 2:1:6.1. The tris(hydroxymethyl)aminomethane has pH 8.5. The obtained mixture is dispersed using ultrasonic waves at 20 kilohertz frequency for 10 minutes, and then subjected to magnetic stirring for 24 hours. The obtained precipitate is washed with deionized water, and then dried to obtain graphene oxide mixture. The obtained graphene oxide mixture is mixed with benzoic acid and copper acetate monohydrate in ratio of 3:5:8.6. USE - Method for preparing nano-composite (claimed). ADVANTAGE - The method enables to prepare nano-composite in simple, cost-effective and eco-friendly manner, and has good dispersibility, strong absorbing ability and uniform particle size. DETAILED DESCRIPTION - Preparing nano-composite involves mixing dopamine hydrochloride, graphene oxide and tris(hydroxymethyl)aminomethane in ratio of of 2:1:6.1. The tris(hydroxymethyl)aminomethane has pH 8.5. The obtained mixture is dispersed using ultrasonic waves at 20 kilohertz frequency for 10 minutes, and then subjected to magnetic stirring for 24 hours. The obtained precipitate is washed with deionized water, and then dried to obtain graphene oxide mixture. The obtained graphene oxide mixture is mixed with benzoic acid and copper acetate monohydrate in ratio of 3:5:8.6. N,N-dimethylformamide, ethanol, deionized water and triacetate amine are mixed in ratio of 80:80:120:1. The benzoic acid is mixed with N,N-dimethylformamide in ratio of 1:64. The benzoic acid is dissolved in N,N-dimethylformamide and ethanol mixed solution. The obtained mixture is added with graphene oxide mixture and copper acetate monohydrate. The obtained mixture is dissolved in water. The obtained solution is added with triethylamine with stirring at room temperature for 3 hours. The obtained product is washed with N,N-dimethylformamide, and then dried to obtain nano-composite.