▎ 摘　　要

NOVELTY - A photocatalyst comprises 0.5-5 %mass reduced graphene oxide, 15-25 %mass bismuth(III) oxide, and 75-85 %mass graphitic carbon nitride. USE - Photocatalyst. ADVANTAGE - The photocatalyst has improved photocatalytic performance, achieves effective separation of photogenerated carriers, and has the ability to couple the target functional group to enable it to act as a second specific oxygen production catalyst, which is conducive to the capture of electrons. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the photocatalyst, which involves ultrasonically dispersing graphene oxide in ethylene glycol, adding polyvinylpyrrolidone and urea, stirring to dissolve without precipitation to obtain solution (A), ultrasonically dispersing bismuth(III) nitrate pentahydrate in 0.1 M nitric acid solution to obtain solution (B), dripping solution (B) to solution (A) to obtain mixed solution (C), transferring to Teflon (RTM: PTFE)-lined stainless steel reactor, solvothermally reacting at 100-150 degrees C for 3-5 hours, cooling to room temperature, collecting precipitate by high-speed centrifugation, washing with ethanol and deionized water several times, putting in vacuum drying oven at 55-65 degrees C, drying for 8-12 hours to obtain reduced graphene oxide/bismuth(III) oxide heterojunction material, subjecting melamine to solid-phase reaction treatment at 400-600 degrees C for 11-13 hours in muffle furnace to obtain block graphitic carbon nitride, grinding into powder, putting in muffle furnace for thermal oxidation reaction at 530-550 degrees C for 2-3 hours, adding mixed solution of ethanol and deionized water, ultrasonically stirring at 500-800 rpm for 45-85 minutes at room temperature, working frequency of 40-60 kHz and power of 80-100 W to obtain layered graphitic carbon nitride solution, centrifuging at 5000-8000 rpm for 8-12 minutes, placing in vacuum drying oven at 55-65 degrees C for 8-12 hours to obtain graphitic carbon nitride nano flakes, dispersing at rate of 500-800 rpm for 45-85 minutes graphitic carbon nitride nano flakes in methanol, adding heterojunction material, dispersing, drying in oil bath to remove methanol, evaporating to dryness, and annealing.