▎ 摘　　要

NOVELTY - Preparation of highly selective composite color film includes preparing high specific surface area graphene, taking magnetic nanocrystalline cellulose, diluting to 0.5-2 wt.%, such that nanocrystalline cellulose is at 99.0-99.7%, adding 0.3-1.0 wt.% graphene, 0.6-0.8 wt.% (based on the weight of graphene) benzophenone as photoinitiator, mixing, ultrasonically processing for 3-5 hours and controlling temperature at 38-40 degrees C. USE - Preparation of highly selective composite color film. DETAILED DESCRIPTION - Preparation of highly selective composite color film comprises preparing high specific surface area graphene by taking graphene oxide, immersing in alkaline electrolyte, ultrasonically dispersing for 20-30 minutes, freeze drying to obtain graphene oxide aerogel, controlling voltage at 80-120 V and temperature at 240-250 degrees C, and conducting thermal reduction; preparing magnetic nanocrystalline cellulose by taking cellulose raw material, adding acid solution, adjusting pH at 4-5, stirring at 68-70 degrees C, adding 0.08 mass% ferric sulfate solution and deionized water at 90-100 degrees C, reacting for 20-25 minutes, centrifugally separating, obtaining precipitates, washing and repeating until separated supernatant is clear; and preparing composite color film by taking magnetic nanocrystalline cellulose, diluting to 0.5-2 wt.%, such that nanocrystalline cellulose is at 99.0-99.7%, adding 0.3-1.0 wt.% graphene, 0.6-0.8 wt.% (based on the weight of graphene) benzophenone as photoinitiator, mixing, ultrasonically processing for 3-5 hours and controlling temperature at 38-40 degrees C.