▎ 摘　　要

NOVELTY - The preparation method of cerium oxide/graphene quantum dot/graphite-phase carbon nitride composite photocatalyst material involves weighing melamine, adding cerium oxalate into a agate mortar, grinding, adding into an alumina crucible, and placing in a muffle furnace to obtain light yellow cerium oxide graphite-phase carbon nitride, dissolving citric acid and urea in deionized water, adding into reactor, drying and cooling to obtain uniform dispersion of nitrogen-doped graphene quantum dot solution, dispersing in water, and ultrasonically processing to obtain solution (A). USE - Preparation method of cerium oxide/graphene quantum dot/graphite-phase carbon nitride composite photocatalyst material (claimed). ADVANTAGE - The method enables preparation of cerium oxide/graphene quantum dot/graphite-phase carbon nitride composite photocatalyst material with excellent electron-hole separation effect, electron transporting ability and high efficient photocatalytic activity. DETAILED DESCRIPTION - The preparation method of cerium oxide/graphene quantum dot/graphite-phase carbon nitride composite photocatalyst material involves (1) weighing 12-13 g melamine, adding 0.2-0.5 g cerium oxalate into a agate mortar, uniformly grinding, adding into an alumina crucible having capacity of 25 ml, and placing in a muffle furnace at 610-660 degrees C constant temperature for 2-4 hours to obtain light yellow cerium oxide graphite-phase carbon nitride, (2) taking 0.8-0.9 g citric acid and 0.65-0.95 g urea, dissolving in 15-20 ml deionized water, adding into 50 ml reactor after completely dissolving, placing in a blast drying box, drying at 160-180 degrees C constant temperature for 8-12 hours, and cooling to room temperature to obtain uniform dispersion of nitrogen-doped graphene quantum dot solution, dispersing 1-3 ml nitrogen-doped graphene quantum dot solution in 30 ml deionized water, and ultrasonically processing to obtain solution (A), (3) dissolving 0.1-0.5 g light yellow cerium oxide graphite-phase carbon nitride obtained in the step (1) in 10-20 ml water, ultrasonically processing for 1-5 hours, dripping the solution (A), and stirring at room temperature for 15-20 hours to obtain turbid liquid (B), and (4) filtering the turbid liquid (B), washing, and drying.