▎ 摘　　要

NOVELTY - A chitin nanofibril-graphene composite aerogel is prepared by subjecting chitin to nanofibrillation treatment, intercalating chitin nanofibrils with graphene oxide to form a composite solution of chitin nanofibrils and graphene oxide, performing redox reaction to obtain chitin nanofibril-graphene composite, adding chitin fiber dispersion, dispersing, adding graphene oxide dispersion, stirring, treating for 20-30 minutes, pulverizing, to obtain uniformly dispersed mixture of chitin nanofibrils and graphene oxide, adding hydrazine hydrate under normal temperature and normal pressure, such that mass ratio of hydrazine hydrate and graphene oxide is 1:2-6, dispersing uniformly, adding ammonium hydroxide to adjust the pH of the system to 10, stirring at room temperature and 500-800 rpm for 15-20 minutes, reacting to 85-95 degrees C for 1-2 hours in sealed environment, cooling the resultant reaction mixture to room temperature, dialyzing with water, water washing, centrifuging, and freeze drying. USE - Chitin nanofibril-graphene composite aerogel is used in electrochemical and sensing application, and energy and adsorption application. ADVANTAGE - The chitin nanofibril-graphene composite aerogel can be prepared by a simple process using economical raw materials. DETAILED DESCRIPTION - A chitin nanofibril-graphene composite aerogel is prepared by subjecting chitin to nanofibrillation treatment, intercalating chitin nanofibrils with graphene oxide to form a composite solution of chitin nanofibrils and graphene oxide, performing redox reaction to obtain chitin nanofibril-graphene composite, adding chitin fiber dispersion, ultrasonically dispersing at 25-45 degrees C and 1000-1500 W for 60-120 minutes, adding uniformly dispersed graphene oxide solution prepared by dispersing graphene oxide solution, mechanically stirring at normal temperature for 10-20 minutes, treating at 1000-1500 W for 1-2 hours, in mass ratio of 1:20-45, stirring at constant temperature and pressure in a magnetic stirrer at 800-1000 rpm for 0.5-1 hour, treating for 20-30 minutes, pulverizing at 1000-1500 W for 1-2 hours in an ultrasonic pulverizer to obtain uniformly dispersed mixture of chitin nanofibrils and graphene oxide, adding hydrazine hydrate under normal temperature and normal pressure, such that mass ratio of hydrazine hydrate and graphene oxide is 1:2-6, dispersing uniformly, adding ammonium hydroxide to adjust the pH of the system to 10, stirring at room temperature and 500-800 rpm for 15-20 minutes, reacting to 85-95 degrees C for 1-2 hours in sealed environment, cooling the resultant reaction mixture to room temperature, dialyzing with distilled water, washing with distilled water to neutral, centrifuging to obtain a complex of chitin nanofibrils and graphene, and freeze drying at -80 degrees C for 2 hours. The chitin fiber dispersion is prepared by purifying a chitin-rich material by chemical extraction to obtain a purified chitin material, formulating into 1 L 1 %mass solution, adding 0.1 mmol (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl and 1 mmol sodium bromide, magnetically stirring at 500-800 rpm for 20-30 minutes, heating to 60 degrees C, adding 3 mmol sodium hypochlorite, adjusting pH of the resultant solution to 10 using sodium hydroxide, reacting for 2 hours, adding ethanol to complete the reaction, rinsing the resultant reaction mixture with distilled water, adjusting pH to 6-7, formulating the resultant mixture into 0.01-1 %mass solution and mechanically treating for 1-2 hours.