▎ 摘　　要

NOVELTY - Preparing graphene composite structural material comprises e.g. using methane as growing gas, argon as shielding gas, hydrogen as reducing gas, nickel metal foil as catalyst, annealing graphene film to obtain graphene film, mixing graphite powder and 98 wt.% concentrated sulfuric acid under ice bath in a ratio of 1:20-50 to obtain first solution, adding potassium permanganate into the first solution to obtain second solution, where ratio between first solution and potassium permanganate is 1:0.1-0.3, heating second solution at 30-40 degrees C, stirring for 1-3 hours, adding deionized water to obtain third solution, where volume ratio between deionized water and second solution is 2-3:1, heating third solution at 80-100 degrees C, stirring for 1-2 hours to obtain fourth solution, adding deionized water into the fourth solution in a ratio of 3-5:1, stirring, cooling to room temperature to obtain fifth solution and then adding 30 wt.% hydrogen peroxide into the fifth solution. USE - The graphene composite structural material is useful in the field of solar water cleaning and deicing device. ADVANTAGE - The material: has simple preparation process, excellent photo-thermal conversion capability and excellent electricity-heat conversion ability. DETAILED DESCRIPTION - Preparing graphene composite structural material comprises (i) using methane as growing gas, argon as shielding gas, hydrogen as reducing gas, nickel metal foil as catalyst, annealing graphene film having a thickness of 2-6 mu m at 800-1050 degrees C to obtain graphene film, (ii) mixing graphite powder and 98 wt.% concentrated sulfuric acid under ice bath in a ratio of 1:20-50 to obtain first solution, adding potassium permanganate into the first solution to obtain second solution, where ratio between first solution and potassium permanganate is 1:0.1-0.3, heating second solution at 30-40 degrees C, stirring for 1-3 hours, adding deionized water to obtain third solution, where volume ratio between deionized water and second solution is 2-3:1, heating third solution at 80-100 degrees C, stirring for 1-2 hours to obtain fourth solution, adding deionized water into the fourth solution in a ratio of 3-5:1, stirring, cooling to room temperature to obtain fifth solution, adding 30 wt.% hydrogen peroxide into the fifth solution in a ratio of 1-5:50, suction filtering and centrifuging with deionized water to obtain aqueous solution of graphene oxide having a concentration of 2-20 mg/ml, (iii) placing the graphene film prepared in step (i) on the surface of the aqueous graphene oxide solution of the step (ii), freezing in a liquid nitrogen bath or in an environment below at -15 degrees C to obtain graphene film/graphene oxide gel composite frozen bulk material, (iv) placing graphene film/graphene oxide gel composite frozen bulk material of the step (iii) in a freeze dryer, drying for 12-72 hours, freeze drying at a internal pressure of less than 100 Pa to obtain graphene film/graphene oxide foam composite, (v) subjecting graphene film/graphene oxide foam composite material of the step (iv) to reduction treatment to obtaining graphene film/graphene foam composite, where reduction treatment method is high temperature heating reduction method or laser irradiation reduction method, and (vi) perforating the graphene film side of the graphene film/graphene foam composite material of the step (v) to obtain final product, where density of punching is 0.1-1 per square centimeter, and hole diameter is 0.5-5 mm.