▎ 摘　　要

NOVELTY - The preparation method of nano composite material involves pouring solvent into flask, adding calcium hydride, stirring, and distilling solvent, centrifugal-washing obtained anhydrous solvent with graphene oxide aqueous dispersion liquid to obtain anhydrous solvent dispersion, adding bis(cyclopentadienyl) nickel to anhydrous solvent, ultrasonically dispersing, fully dissolving bis(cyclopentadienyl) nickel, adding graphene oxide anhydrous solvent dispersion, ultrasonically dispersing, transferring the mixed liquid to pressure kettle, reacting in oven, and naturally cooling. USE - Preparation method of nano composite material of carbon coated nickel nanocrystalline particles loaded graphene sheet used in catalytic reduction of p-nitrophenol, adsorption of organic dye and hydrogen evolution. ADVANTAGE - The method enables preparation of nano composite material of carbon coated nickel nanocrystalline particles loaded graphene sheet with excellent catalytic performance and long-term stability, in simple and economical process. DETAILED DESCRIPTION - The preparation method of nano composite material involves (1) pouring 400-800 ml solvent into 1000 ml flask, adding 5-15 g calcium hydride, stirring at room temperature for 6-32 hours, and distilling solvent at 50-130 degrees C to obtain anhydrous solvent, (2) centrifugal-washing anhydrous solvent obtained in step (1) with 2-15 mg/ml graphene oxide aqueous dispersion liquid 2-8 times to obtain anhydrous solvent dispersion, (3) adding 0.01-0.25 g bis(cyclopentadienyl) nickel to 8 ml anhydrous solvent, ultrasonically dispersing for 5-60 minutes, fully dissolving bis(cyclopentadienyl) nickel, adding 1-5 ml graphene oxide anhydrous solvent dispersion, ultrasonically dispersing for 10-100 minutes, transferring the mixed liquid to pressure kettle, reacting in oven at 150-250 degrees C for 2-36 hours, naturally cooling to room temperature, removing material liquid, centrifugal-washing with anhydrous ethyl alcohol 3-10 times, placing the reactant in oven, and drying at 50-120 degrees C for 2-24 hours, and (4) placing 0.1-1 g dried powder in a tubular furnace, heating at 350-700 degrees C under protection of gas, heat-preserving for 1-6 hours, and cooling under protection of gas. INDEPENDENT CLAIMS are included for the following: (1) nano composite material of carbon coated nickel nanocrystalline particles loaded graphene sheet; and (2) application of nano composite material of carbon coated nickel nanocrystalline particles loaded graphene sheet in catalytic reduction of p-nitrophenol, adsorption of organic dye and hydrogen evolution.