▎ 摘　　要

NOVELTY - Preparing a cuprous oxide/reduced graphene visible light photocatalyst by low temperature liquid phase precipitation, involves dissolving copper salt and organic acid in deionized water, then add aqueous dispersion of graphene oxide at mass concentration of 5 mg/mL, stirring at constant temperature of 25 degrees C for 0.5-1.5 hours, and then adding hydroxide having mass concentration of 20%. The sodium solution is stirred at 25 degrees C for 15-45 minutes, and then added with reducing agent aqueous solution having mass concentration of 20%. The reaction is stirred at 25-60 degrees C for 1-4 hours. After reaction is completed, product is centrifuged, using deionized water. The ethanol is washed 3-5 times, dried by centrifugation, and pulverized to obtain a cuprous oxide/reduced graphene visible light photocatalyst. The mass ratio of copper salt, graphene oxide and deionized water is 1-10:0.01-0.5:50-100, and molar ratio of copper salt, organic acid, sodium hydroxide and reducing agent is 1:0.5-2:2.6:0.5-2. USE - Preparing a cuprous oxide/reduced graphene visible light photocatalyst by low temperature liquid phase precipitation. ADVANTAGE - The preparation method of the cuprous oxide/reduced graphene photocatalyst is simple and easy, and it is not necessary to add a polymer or a surfactant LED lamp for 45 minutes to oxidize the cuprous oxide/reduced graphene photocatalyst to the 10-50 mg/L dye solutions. DETAILED DESCRIPTION - Preparing a cuprous oxide/reduced graphene visible light photocatalyst by low temperature liquid phase precipitation, involves dissolving the copper salt and the organic acid in deionized water, then add the aqueous dispersion of graphene oxide at a mass concentration of 5 mg/mL, stirring at a constant temperature of 25 degrees C for 0.5-1.5 hours, and then adding a hydroxide having a mass concentration of 20%. The sodium solution is stirred at 25 degrees C for 15-45 minutes, and then added with a reducing agent aqueous solution having a mass concentration of 20%. The reaction is stirred at 25-60 degrees C for 1-4 hours. After the reaction is completed, the product is centrifuged, using deionized water and no. The ethanol is washed 3-5 times, dried by centrifugation, and ground to obtain a cuprous oxide/reduced graphene visible light photocatalyst. The mass ratio of copper salt, graphene oxide and deionized water is 1 to 10: 0.01-0.5:50-100, and the molar ratio of copper salt, organic acid, sodium hydroxide and reducing agent is 1:0.5-2:2.6:0.5-2. When the white light emitting diode (LED) lamp is illuminated for 30 to 45 minutes, the photocatalytic degradation of the dye solution by the cuprous oxide/reduced graphene photocatalyst is basically balanced. When the white LED lamp is illuminated for 45 minutes, the cuprous oxide/reduced graphene photocatalyst is 10 mg. The photocatalytic dye degradation rates of L and 50mg/L dye solutions reached 80-99.5% and 42-62.5%, respectively. The photocatalytic dye degradation rate of cuprous oxide/reduced graphene photocatalyst after 5 cycles of utilization was the first time. Catalytic dye degradation rate of 76.3-91.6%.