▎ 摘　　要

NOVELTY - Preparation of ternary composite photocatalyst involves mixing potassium persulfate, phosphorus pentoxide and graphite in three-necked flask to obtain sample, dripping concentrated sulfuric acid, heating in oil bath, cooling to room temperature, mixing sample with sodium nitrate, adding potassium permanganate to three-necked flask, reacting, leaving still, washing, stirring into suspension, adding hydrogen peroxide, drying to obtain oxidized graphene, dispersing cuprous chloride and ferric chloride hexahydrate in ethylenediamine solvent separately, ultrasonically processing, mixing two solutions, adding ammonium sulfide solution, mixing, transferring to PTFE lined reactor, reacting, washing black solid with deionized water, collecting precipitate, drying to obtain bornite promoter, dispersing graphitic carbon nitride in deionized water, adding bornite promoter and oxidized graphene, reacting, cooling, washing product with deionized water and absolute ethanol, and drying. USE - Preparation of ternary composite photocatalyst. ADVANTAGE - The method provides ternary composite photocatalyst with enhanced catalytic activity. DETAILED DESCRIPTION - Preparation of ternary composite photocatalyst involves mixing potassium persulfate, phosphorus pentoxide and graphite in ratio of 5:5:4 in three-necked flask to obtain sample, dripping concentrated sulfuric acid, heating in oil bath, cooling to room temperature, dripping product to distilled water at 70-80 degrees C, suction filtering, adjusting pH value to 7, drying, adding concentrated sulfuric acid to three-necked flask, mixing sample with sodium nitrate, adding potassium permanganate to three-necked flask in batches, stirring, reacting in oil bath at 35 degrees C for 1 hour, leaving still for 2 days, where ratio of sample, sodium nitrate and potassium permanganate is 5:4:22.5, washing, stirring into suspension, adding hydrogen peroxide, stirring until liquid changes color, grading solution, centrifugally washing to remove lower layer of yellow viscous liquid by washing with dilute hydrochloric acid until no precipitation is detected, washing twice with water until supernatant in centrifuge tube reaches pH of 7, adding to Petri dish, drying at 50 degrees C to obtain oxidized graphene, dispersing cuprous chloride and ferric chloride hexahydrate in ethylenediamine solvent separately, ultrasonically processing for 15 minutes, mixing two solutions, adding double excess ammonium sulfide solution, mixing, transferring solution to PTFE lined reactor, reacting at 180 degrees C for 24 hours, washing black solid with deionized water and absolute ethanol 5-8 times, collecting precipitate by centrifugal washing, drying at 50 degrees C to obtain bornite promoter, dispersing graphitic carbon nitride in deionized water, adding bornite promoter, stirring for 30 minutes, adding oxidized graphene, transferring mixture to PTFE lined reactor, reacting at 180 degrees C for 3 hours, naturally cooling to room temperature, washing product 3-5 times with deionized water and absolute ethanol, and drying at 50 degrees C for 12 hours.