▎ 摘　　要

NOVELTY - Preparing lignin based bio-carbon/graphene composite nanomaterial involves dispersing 50-100 gram lignin raw material in 1000 milliliter water, adjusting pH value to 10-12.5, stirring by centrifugal suction, and filtering or ultrafiltering to obtain lignin solution. The 0.5-10 gram graphene oxide powder is added to lignin solution, ultrasonically dispersed to obtain stably dispersed lignin/graphene oxide mixed solution. The 5-35 gram formaldehyde is added to lignin/graphene mixed solution, reacted for 15-60 minutes to obtain mixture. USE - Method for preparing lignin based bio-carbon/graphene composite nanomaterial (claimed). ADVANTAGE - The method enables to prepare lignin based bio-carbon/graphene composite nanomaterial is prepared in simple, and cost-effective manner, has wide source, reproducible, high carbon content to form high carbon content with graphene composite nano material, high specific surface area, and has excellent conductivity. DETAILED DESCRIPTION - Preparing lignin based bio-carbon/graphene composite nanomaterial involves dispersing 50-100 gram lignin raw material in 1000 milliliter water, adjusting pH value to 10-12.5, stirring by centrifugal suction, and filtering or ultrafiltering to obtain lignin solution. The 0.5-10 gram graphene oxide powder is added to lignin solution, ultrasonically dispersed to obtain stably dispersed lignin/graphene oxide mixed solution. The 5-35 gram formaldehyde is added to lignin/graphene mixed solution, reacted for 15-60 minutes to obtain mixture, then added 0-50 gram organic amine to continued reaction for 0.5-6 hours. The 0.1-2 mole/liter hydrochloric acid is added to lignin/graphene complex, flocculated, sedimentation, filtered, and dried to obtain lignin/ graphene complex. The lignin/graphene composite is heated under protection of inert gas, and thermally carbonized to obtain lignin-based bio-carbon/ graphene composite nanomaterials.