▎ 摘　　要

NOVELTY - Preparing graphene composite material involves preparing 1-100 g/L of dopamine hydrochloric acid buffer solution, adjusting pH value to 8.5, dipping salix cellulose dipped in the buffer solution for 24 hours at room temperature. The bath ratio is 1:50, and washed by de-ionized water to obtain poly-dopamine modified salix cellulose. The silk is placed into the de-ionized water to prepare aqueous solution of 1-100 g/L, dripped 1-100 g/L trivalent iron salt aqueous solution into silk protein aqueous solution under condition of 50-80 degrees C. USE - Method for preparing graphene composite material. ADVANTAGE - The method enables to prepare has sufficient raw material and potential application value, and in cost effective manner. DETAILED DESCRIPTION - Preparing graphene composite material involves preparing 1-100 g/L of dopamine hydrochloric acid buffer solution, adjusting pH value to 8.5, dipping salix cellulose dipped in the buffer solution for 24 hours at room temperature. The bath ratio is 1:50, and washed by de-ionized water to obtain poly-dopamine modified salix cellulose. The silk is placed into the de-ionized water to prepare aqueous solution of 1-100 g/L, dripped 1-100 g/L trivalent iron salt aqueous solution into silk protein aqueous solution under condition of 50-80 degrees C, stirred them uniformly, where ratio of silk protein and trivalent iron salt is 1:1-10:1. The 1-5 wt.% of calcium chloride solution is added with 30 drops/minute speed, pH value is adjusted to 10-12, stirred at 60 degrees C for 1 hour at uniform speed. The poly-dopamine modified salix cellulose is added, ultrasonically mixed uniformly, poured into mold, placed into liquid nitrogen for 1 minutes. The mixture is placed in refrigerator at (-)20-(-)80 degrees C for 6 hours, and dried for 6-48 hours into freeze dryer to obtain magnetic porous composite material. The 1-100 g/L of graphene oxide aqueous solution is stirred ultrasonically for 1 hour, 1-100 g/L of silver nitrate solution is added, mixed uniformly. The magnetic porous composite material is soaked in mixed solution of graphene oxide and silver nitrate for 24 hours. The bath ratio is 1:50. The mixture is washed by ethanol and de-ionized water, reducing agent is added to reduce, washed by ethanol and de-ionized water, and dried in vacuum to obtain graphene composite material.