▎ 摘　　要

NOVELTY - Preparing silver sulfide/silver phosphate/graphene oxide composite photocatalyst involves preparing graphene oxide (GO) according to the improved Hummers method, and dispersing the prepared GO in deionized water and sonicating for 3 hours to obtain a GO suspension. A certain concentration of ethanol aqueous solution (the volume ratio of ethanol to water is 1:1.83) is configured, and divided the configured ethanol aqueous solution into two equal parts. The 1-5 millimole of silver nitrate is added to one portion and stirred it thoroughly to form a first mixed solution. The 0.1-3 millimole of sodium dihydrogen phosphate is added in another portion, and stirred it thoroughly to form a second mixed solution. The prepared second mixed solution is placed in a constant temperature magnetic heating stirrer, and under the condition of stirring, the first mixed solution is slowly added dropwise to the second mixed solution and fully stirred for 20-40 minutes. USE - Method for preparing silver sulfide/silver phosphate/graphene oxide composite photocatalyst. ADVANTAGE - The method enables to prepare silver sulfide/silver phosphate/graphene oxide composite photocatalyst in a simple way, raw materials are cheap and readily available, the preparation cycle is short, and the chemical properties of the prepared materials are stable, and prepared photocatalyst has photocatalytic activity in a wide range of wavelengths, can photocatalytically degrade organic pollutants under visible light or natural light radiation, and has good application prospects. DETAILED DESCRIPTION - Preparing silver sulfide/silver phosphate/graphene oxide composite photocatalyst involves preparing graphene oxide (GO) according to the improved Hummers method, and dispersing the prepared GO in deionized water and sonicating for 3 hours to obtain a GO suspension. A certain concentration of ethanol aqueous solution (the volume ratio of ethanol to water is 1:1.83) is configured, and divided the configured ethanol aqueous solution into two equal parts. The 1-5 millimol of silver nitrate is added to one portion and stirred it thoroughly to form a first mixed solution. The 0.1-3 millimol of sodium dihydrogen phosphate is added in another portion, and stirred it thoroughly to form a second mixed solution. The prepared second mixed solution is placed in a constant temperature magnetic heating stirrer, and under the condition of stirring, the first mixed solution is slowly added dropwise to the second mixed solution and fully stirred for 20-40 minutes. A certain amount of solid sodium sulfide is weighed, and prepared a 0.01 mol/L sodium sulfide solution, slowly added 0.5-5 ml of sodium sulfide solution to the above mixture dropwise, and continue stirred under dark conditions for 3-5 hours. The 5-60 ml of the GO suspension is added and continue stirred for 2-4 hours. The obtained reaction product is centrifuged, washed with deionized water and ethanol 5 times, and then dried under vacuum at 60 degrees C for 12 hours to obtain a silver sulfide/silver phosphate/graphene oxide composite photocatalyst.