▎ 摘　　要

NOVELTY - Preparing graphene/tantalum nitride composite photocatalyst comprises adding the graphene oxide dispersion into tantalum nitride nanofiber, where the mass ratio of graphene oxide and tantalum nitride nanofiber is 1:10-1:1000, ultrasonicating for 10 minutes, and stirring for 1-10 hours; transferring the resulting mixed solution into hydrothermal reaction kettle containing solvent, and carrying out thermal reaction; washing the obtained product with ultra-pure water and ethanol alternately, and centrifuging three times, and vacuum drying at 50-80 degrees C for 6 hours. USE - The method is useful for preparing graphene/tantalum nitride composite photocatalyst (claimed). ADVANTAGE - The photocatalyst exhibits efficient and stable visible light photocatalytic properties. The method is simple, economical, and suitable for large scale production. DETAILED DESCRIPTION - Preparing graphene/tantalum nitride composite photocatalyst comprises (i) mixing anhydrous ethanol and acetic acid in the volume ratio of 3-4:1, then adding 5-10 wt.% PVP and 10 wt.% tantalum source, mixing by stirring for 1-12 hours, to obtain a clear sol; (ii) spinning the obtained sol, maintaining the nozzle tip and receiver at a distance of 8-20 cm, applying a direct currect voltage of 1-20000 volts, and advancing the syringe speed at 0.3-1 ml/hour, to obtain polymer composite nanofiber; (iii) calcining the polymer composite nanofiber in a muffle furnace to obtain tantalum oxide nanofiber; (iv) placing the tantalum oxide nanofiber in a tube furnace, nitriding at high temperature, cooling the reaction to room temperature under ammonia atmosphere to obtain tantalum nitride nanofiber; (v) dissolving 5-30 mg graphene oxide in an organic solvent,and ultrasonicating for 1-2 hours to obtain graphene oxide dispersion; (vi) adding the graphene oxide dispersion into tantalum nitride nanofiber, where the mass ratio of graphene oxide and tantalum nitride nanofiber is 1:10-1:1000, ultrasonicating for 10 minutes, and stirring for 1-10 hours; (vii) transferring the resulting mixed solution into hydrothermal reaction kettle containing solvent, and carrying out thermal reaction; (viii) washing the obtained product with ultra-pure water and ethanol alternately, and centrifuging three times, and vacuum drying at 50-80 degrees C for 6 hours.