▎ 摘　　要

NOVELTY - Preparing graphene/riboflavin composite material comprises e.g. (i) adding riboflavin into N,N-dimethylacetamide, (ii) adding carboxylated graphene and concentrated hydrochloric acid into yellow solution to obtain first mixture, (iii) adding first mixture into microwave reactor, performing microwave catalytic reaction to obtain second mixture, where microwave reaction temperature is 80-150 degrees C, and reaction power is 500-900 W, (iv) sonicating second mixture, and (v) rinsing second mixture in N,N-dimethylacetamide and deionized water, vacuum drying to obtain final product. USE - The composite material is useful in fuel cell power generation and water pollutant degradation. ADVANTAGE - The graphene/riboflavin composite material has high electron transfer efficiency, simple process, low cost, short cycle and is environmentally friendly and suitable for large-scale industrial production. DETAILED DESCRIPTION - Preparing graphene/riboflavin composite material comprises (i) adding riboflavin into N,N-dimethylacetamide to obtain yellow solution after heating, (ii) adding carboxylated graphene and concentrated hydrochloric acid into yellow solution to obtain first mixture after heated in water bath, where mass ratio between riboflavin and carboxylated graphene is 1:1-2:1, concentration of concentrated hydrochloric acid is 12 mol/l, volume ratio between concentrated hydrochloric acid and N,N-dimethylacetamide is 0.4:100, (iii) adding first mixture into microwave reactor, performing microwave catalytic reaction to obtain second mixture, where microwave reaction temperature is 80-150 degrees C, reaction time is 20 plus minus 2 minutes, and reaction power is 500-900 W, (iv) sonicating second mixture, and (v) rinsing second mixture in N,N-dimethylacetamide and deionized water, vacuum drying to obtain final product.