▎ 摘　　要

NOVELTY - The preparation of high-conductivity self-supporting graphene film involves (i) cleaning plastic waste, cutting the clean plastic waste, (ii) adding metal nickel foil into ethanol and acetone solution, ultrasonically cleaning, adding cleaned metal nickel foil and cut plastic waste into a tube furnace, passing hydrogen and argon, reacting to obtain graphene film-loaded metal nickel foil, (iii) placing the graphene film-loaded metal nickel foil in a mixed solution of hydrochloric acid and ferric chloride, etching the metal nickel foil, washing the graphene film with water, and drying. USE - Preparation of high-conductivity self-supporting graphene film used as high performance conductive material. ADVANTAGE - The method enables the preparation of high-conductivity self-supporting graphene film by simple process at low cost with high plastic waste conversion value, flexibility, and conductivity. DETAILED DESCRIPTION - The preparation method of high-conductivity self-supporting graphene film involves (i) cleaning plastic waste, cutting the clean plastic waste, (ii) adding metal nickel foil into ethanol and acetone solution, ultrasonically cleaning, adding cleaned metal nickel foil and cut plastic waste into a tube furnace, passing hydrogen at a rate of 20-30 sccm and argon at a rate of 150-250 sccm, reacting at 850-1050 degrees C for 120-180 minutes to obtain graphene film-loaded metal nickel foil, (iii) placing the graphene film-loaded metal nickel foil in a mixed solution of hydrochloric acid and ferric chloride, completely etching the metal nickel foil, washing the graphene film with water, and drying. The mixed solution has hydrochloric acid concentration of 0.5-2 mol/l, and ferric chloride concentration of 1-3 mol/l.