▎ 摘　　要

NOVELTY - Hydrothermal preparation of graphene comprises dipping expanded graphite (EG) in calcium chloride aqueous solution to obtain EG suspension solution (a), dropping urea aqueous solution, adding to suspension solution (a), standing to obtain EG suspension (b) at room temperature, transferring EG suspension solution (b) to reaction kettle, taking PTFE as substrate, reacting, vacuum filtering, washing until neutral, vacuum drying, dispersing into absolute ethyl alcohol, ultrasonically dispersing, vacuum filtering, washing with deionized water, and vacuum drying to obtain graphene. USE - Method of hydrothermal preparation of graphene (claimed). ADVANTAGE - The method is simple, and utilizes easy to obtain material. DETAILED DESCRIPTION - Hydrothermal preparation of graphene comprises dipping expanded graphite in calcium chloride aqueous solution to obtain EG suspension solution (a), dropping urea water solution while stirring, adding EG to suspension solution (a), standing to obtain EG suspension (b) at room temperature, transferring EG suspension solution (b) to reaction kettle, taking PTFE as substrate, reacting at 8-50 degrees C for 20 hours, vacuum filtering, washing until neutral, vacuum drying, dispersing product into absolute ethyl alcohol, ultrasonically dispersing, vacuum filtering, washing with deionized water, and vacuum drying to obtain graphene.