▎ 摘　　要

NOVELTY - Preparation of graphene-Salix-konjac composite material, involves dispersing Salix cellulose in deionized water, adding sodium periodate to obtain sodium periodate modified Salix cellulose, preparing dopamine Tris-hydrochloride buffer, dispersing konjac flour, dispersing sodium periodate modified Salix cellulose and polydopamine modified konjac in deionized water, dripping ferric salt solution, immersing Salix-konjac composite material in graphene oxide solution, adding reducing agent and drying to obtain final product. USE - Method for preparing graphene-Salix-konjac composite material for adsorptive material and biological material. DETAILED DESCRIPTION - Method for preparing graphene-Salix-konjac composite material, involves (S1) peeling Salix, crushing to 50-100 mesh sieve, drying at 80-100 degrees C to obtain Salix powder, cooling, adding Salix to reactor, adding anhydrous ethanol-acetic acid mixture in bath ratio of 1:10, heating at 100-160 degrees C, stirring for 1-5 hours, cooling, filtering, washing with anhydrous ethanol for 2-5 times, repeatedly rinsing with deionized water, drying to obtain Salix cellulose, (S2) dispersing Salix cellulose in deionized water in bath ratio of 1:50, adding 1-20 g/L sodium periodate, heating at 50-80 degrees C for 30-60 minutes, repeatedly washing with deionized water, drying to obtain sodium periodate modified Salix cellulose, (S3) preparing 0.1-10 g/L dopamine Tris-hydrochloride buffer, adjusting pH to 8.5, dispersing the konjac flour in buffer for 24 hours at room temperature in liquor ratio of 1:50, repeatedly washing with deionized water, drying to obtain polydopamine modified konjac, (S4) dispersing sodium periodate modified Salix cellulose and polydopamine modified konjac in deionized water in a ratio of 1:50, mixing and stirring at 80 degrees C, slowly dripping 1-100 g/L ferric salt solution, stirring at 80 degrees C for 24 hours, pouring into mold, placing in liquid nitrogen for 1 minute, placing in refrigerator at -20 degrees C, pre-freezing for 6 hours, placing in thermo cryogenic refrigerator at -80 degrees C for 6 hours, placing in freeze dryer for 24 hours to obtain Salix-konjac composite material, (S5) preparing 0.1-100 g/L concentration of graphene oxide solution, ultrasonically processing for 1 hour, immersing Salix-konjac composite material in graphene oxide solution for 12 hours, removing ethanol, repeatedly cleaning with deionized water, adding reducing agent, carrying out reduction reaction, repeatedly washing with ethanol and deionized water and drying in vacuum to obtain final product. The mass ratio of ferric salt and sodium periodate modified Salix cellulose is 1:5-1:10.