▎ 摘　　要

NOVELTY - Preparation of cobalt oxide/graphene carbonitride composite catalyst, involves (i) obtaining yellow-white powder as graphene-like carbon-nitrogen compound (ii) adding graphene-like carbon-nitrogen compound into a 25 mL PTFE substrate in a reaction kettle, adding cobalt tetrahydrate acetate, ultrasonically-processing with absolute ethanol, adding concentrated aqueous ammonia, homogeneously stirring, introducing nitrogen gas, placing in a blast oven at 150 degrees C for 3 hours, (iii) separating the solids, centrifuging with deionized water, washing with ethanol and drying. USE - Preparation of cobalt oxide/graphene carbonitride composite catalyst used for photocatalytic hydrogen production (claimed) in industrial application. ADVANTAGE - The cobalt oxide/graphene carbonitride composite catalyst is prepared with non-toxic and environmentally-friendly function, by a simple method at low cost. The method increases photocatalytic hydrogen production rate and reduces cost. DETAILED DESCRIPTION - Preparation of cobalt oxide/graphene carbonitride composite catalyst, involves (i) taking appropriate amount of thiourea, placing in a crucible, calcining the crucible in a muffle furnace at 550 degrees C for 2 hours, reducing the temperature of muffle furnace to room temperature and taking out the crucible, triturating the yellow solid, and then placing in the crucible, placing the crucible in a muffle furnace at 500 degrees C for 2 hours, reducing the temperature of muffle furnace to room temperature and taking out the crucible and obtaining yellow-white powder as graphene-like carbon-nitrogen compound such as graphitic carbon nitride, (ii) adding appropriate amount of the graphene-like carbon-nitrogen compound into a 25 mL PTFE substrate in a reaction kettle, adding appropriate amount of cobalt tetrahydrate acetate, ultrasonically-processing with 10 mL absolute ethanol for 20 minutes, adding 0.5 mL concentrated aqueous ammonia, homogeneously stirring, introducing nitrogen gas during the stirring for 20 minutes, placing the reactor in a blast oven at 150 degrees C for 3 hours, (iii) separating the solids using centrifugal separator after completion of the reaction, centrifuging with deionized water 5-8 times, washing with ethanol 1-3 times, and drying the obtained solid matter, and obtaining the resulting dark gray solid material as cobalt oxide/graphene carbonitride composite catalyst.