▎ 摘　　要

NOVELTY - Preparing metal nano-particle reduced graphene oxide (MNP-rGO) Janus nanosheets comprises mixing the liquid paraffin and GO nano sheet water-dispersed aqueous solution with oil-water, melting the paraffin, emulsifying, immediately ice bath to solidify the paraffin in the mixed solution, removing the large solid paraffin without emulsification, obtaining the dispersed aqueous solution of paraffin micro-sphere wrapped by GO nano sheet, which is oil-in-water type GO nano sheet Pickering emulsion, adding the precursor chloroauric acid or palladium chloride solution of the synthetic metal nano-particles into the GO nano sheet Pickering emulsion, carrying out photodeposition under xenon lamp irradiation, stirring at 400 revolutions/minute, reacting for 3 hours, using petroleum ether to remove paraffin microsphere Pickering emulsion template, using water and ethanol to centrifugally wash the prepared gold/PdNP-rGO Janus nano sheet, and dispersing in ultra-pure water for use. USE - The method is useful for preparing metal nano-particle reduced graphene oxide (MNP-rGO) Janus nanosheets. ADVANTAGE - The method: is economical, simple and efficient, and has high controllability. DETAILED DESCRIPTION - Preparing metal nano-particle reduced graphene oxide (MNP-rGO) Janus nanosheets comprises mixing the liquid paraffin and GO nano sheet water-dispersed aqueous solution with oil-water in volume ratio of 1:1, where GO nano sheet concentration is 0.05 g/l, using 80℃ water bath to melt the paraffin, using homogenizing dispersion machine to high speed emulsify at 30000 revolutions/minute for 1 minute, immediately ice bath to solidify the paraffin in the mixed solution, removing the large solid paraffin without emulsification, obtaining the dispersed aqueous solution of paraffin micro-sphere wrapped by GO nano sheet, which is oil-in-water type GO nano sheet Pickering emulsion, adding the precursor chloroauric acid or palladium chloride solution of the synthetic metal nano-particles into the GO nano sheet Pickering emulsion, carrying out photodeposition under xenon lamp irradiation, stirring at 400 revolutions/minute, reacting for 3 hours, using petroleum ether to remove paraffin microsphere Pickering emulsion template under the action of ultrasonic, using water and ethanol to centrifugally wash the prepared gold/PdNP-rGO Janus nano sheet, and dispersing in ultra-pure water for use. INDEPENDENT CLAIMS are also included for: a metal nanoparticle-reduced graphene oxide (MNP-rGO) Janus nanosheet prepared by above preparation method; and use method of the metal nano-particle reduced graphene oxide (MNP-rGO) Janus nanosheets to the catalytic hydrogenation of p-nitroanisole and the photocatalytic degradation reaction of Nile Red comprising performing hydrogenation of p-nitroanisole catalyzed by Pickering emulsion with PdNP-rGO Janus nanosheet concentration of 0.05 g/l and droplet size of 0.1-1 mm, reacting to reach the conversion of p-nitroanisole to 80% after 0.5 minutes, where the conversion of p-nitroanisole is 75% in the 5th catalytic cycle or performing hydrogenation of p-nitroanisole catalyzed by Pickering emulsion with AuNP-rGO Janus nanosheet concentration of 0.05 g/l and droplet size of 0.1-1 mm, reacting to reach the conversion of p-nitroanisole to 80% after 10 minutes. The photocatalytic degradation rate of Nile Red at 25 minutes in the photocatalytic degradation of Nile Red with a concentration of 0.05 g/l of AuNP-rGO Janus nanosheets and a droplet size of 0.1-1 mm in Pickering emulsion with a concentration of 10 mg/l of Nile Red is 56%, and the photocatalytic degradation rate of Nile Red reached 72% when the reaction is 45 minutes. In the fifth catalytic cycle, the photocatalytic degradation rate of Nile Red is 70%.