▎ 摘　　要

NOVELTY - The liquid phase reducing method comprises taking graphite, adding concentrated sulfuric acid having a concentration of 98% into the graphite, stirring the mixture for 30-50 minutes at 0-4 degrees C to obtain mixture A, adding potassium permanganate into the mixture A at 0-4 degrees C, stirring the mixture for 2-3 hours to obtain mixture B, placing the mixture B in water bath at 34 degrees C for 1 hour and then adding distilled water to dilute the mixture B, adding hydrogen peroxide solution (30 wt.%) and hydrochloric acid (5 wt.%), and cooling the mixture at room temperature. USE - The liquid phase reducing method is useful for preparing graphene loaded nano copper powder material. ADVANTAGE - The liquid phase reducing method is capable of simply and economically preparing the graphene loaded nano copper powder material with high stability and improved chemical performance. DETAILED DESCRIPTION - The liquid phase reducing method comprises taking graphite, adding concentrated sulfuric acid having a concentration of 98% into the graphite, stirring the mixture for 30-50 minutes at 0-4 degrees C to obtain mixture A, adding potassium permanganate into the mixture A at 0-4 degrees C, stirring the mixture for 2-3 hours to obtain mixture B, placing the mixture B in water bath at 34 degrees C for 1 hour and then adding distilled water to dilute the mixture B, adding hydrogen peroxide solution (30 wt.%) and hydrochloric acid (5 wt.%), cooling the mixture at room temperature, filtering the mixture to obtain solid, adding distilled water to the solid of 0.8-0.9 wt.%, putting the mixture into a semipermeable membrane to perform dialysis process until it is neutral to obtain sol-gel, adding distilled water into the sol-gel with a concentration of 0.01 g/ml, adding 0.1 mol/l of copper sulfate pentahydrate solution with the diluted sol-gel, ultrasonically mixing the mixture for 30-60 minutes, adding hydrazine hydrate solution with a mass concentration of 80% and sodium hydroxide solution with a concentration of 0.5 mol/l with sol-gel mixture, centrifuging the mixture for 2 hours at a speed of 300 revaluations per minute to obtain product, washing the product with distilled water, and drying the washed product in vacuum at 40-50 degrees C to obtain graphene loaded nano copper powder material. A mass ratio of graphite and concentrated sulfuric acid is 1 g: 42-43 ml. A mass ratio of graphite and potassium permanganate is 1:8-9. A volume ratio of mixture B and hydrogen peroxide solution is 2.5:3:1. A volume ratio of the mixture B and diluted hydrochloric acid is 2.5-3:1. A volume ratio of sol-gel and copper sulfate pentahydrate solution is 2:1. A mass ratio of sol-gel and sodium hydroxide solution is 2:1. The volume ratio of the sol-gel and the hydrazine hydrate solution is 10:1. The graphite is natural flake graphite. A volume ratio of the mixture B and distilled water is 1:6.