▎ 摘　　要

NOVELTY - A graphene-doped zinc oxide photocatalyst comprises 30-50 pts. wt. zinc nitrate hexahydrate, 5-10 pts. wt. maleic anhydride copolymer, 10-15 pts. wt. graphene oxide, 2-4 pts. wt. metalloporphyrin, 0.5-1.5 pts. wt. lanthanum oxide, and 5-10 pts. wt. chitosan. USE - Graphene-doped zinc oxide photocatalyst. ADVANTAGE - The photocatalyst has large specific surface area, good pore structure, high catalytic active center, improved adsorption performance, improved activity and efficiency, and expanded absorption in visible range, greatly improves utilization rate, and has photocatalytic degradation rate of methylene blue in sunlight at more than 95% for 1 hour. DETAILED DESCRIPTION - A graphene-doped zinc oxide photocatalyst comprises 30-50 pts. wt. zinc nitrate hexahydrate, 5-10 pts. wt. maleic anhydride copolymer, 10-15 pts. wt. graphene oxide, 2-4 pts. wt. metalloporphyrin, 0.5-1.5 pts. wt. lanthanum oxide, and 5-10 pts. wt. chitosan. The photocatalyst is prepared by adding zinc nitrate hexahydrate to ultrasonic generator, adding anhydrous ethanol, dissolving, adding sodium hydroxide solution to adjust pH to 12-13, and sonicating at 40-60 kHz for 30-60 minutes; adding graphene oxide to ultrasonic generator, adding water, and ultrasonically dispersing; adding first suspension and maleic anhydride copolymer, and sonicating at 40-60 kHz for 30-60 minutes; adding remaining raw materials, ball milling, adding water, and stirring; and washing with distilled water, drying at 60-80 degrees C for 3-4 hours, grinding into powder, and furnace-heating at 300-400 degrees C for 3-5 hours.