▎ 摘　　要

NOVELTY - Preparing carbon nano sheet comprises (i) taking 1 pts. wt. oxidized graphene, adding 40-100 ml distilled water, ultrasonically stirring for 1-2 hours, and mixing evenly, (ii) adding 10-100 pts. wt. biomass material, and ultrasonically stirring, (iii) adding 60-80% mixed liquid into the hydrothermal reaction kettle, reacting at 180-250 degrees C for 5-20 hours, repeatedly cleaning and drying with alcohol and distilled water to obtain pleated carbon nanosheet with hydrophilic and anionic functional group on the surface. USE - The method is useful for preparing carbon nano sheet (claimed). ADVANTAGE - The carbon nano sheet has graphene oxide gravitational morphology. The preparation method is simple.