▎ 摘　　要

NOVELTY - Preparing graphite type carbon nitride/nitrogen-doped graphene/bismuth vanadate Z type photocatalyst comprises e.g. (1) dissolving graphite-type carbon nitride/nitrogen-doped graphene in N,N-dimethylformamide and ultrasonically dispersing uniformly, adding bismuth vanadate, continuing carrying ultrasonic treatment, stirring evenly, and centrifuging; the preparation of graphite-type carbon nitride/nitrogen-doped graphene comprises (a) sieving biomass powder through 200-mesh sieve, carbonizing under the protection of nitrogen, obtaining biochar powder; (b) mixing biochar powder and potassium carbonate, calcining under nitrogen protection, cooling to room temperature, and grinding into powder to obtain graphite; (c) dissolving graphite in water, adding hydrazine hydrate, stirring ultrasonically to form mixed solution, transferring to Teflon(polytetrafluroethylene) -lined stainless steel reactor, heating, cooling, rinsing with water and ethanol in turn, drying, grinding to powder. USE - The photocatalyst is useful for photocatalytic efficient degradation of antibiotics in wastewater (claimed). ADVANTAGE - The method: is simple, economical, and environmentally friendly. The photocatalyst: can achieves purpose of efficiently catalytically degrading antibiotics. DETAILED DESCRIPTION - Preparing graphite type carbon nitride/nitrogen-doped graphene/bismuth vanadate Z type photocatalyst comprises (1) dissolving graphite-type carbon nitride/nitrogen-doped graphene in N,N-dimethylformamide and ultrasonically dispersing uniformly, adding bismuth vanadate, continuing carrying ultrasonic treatment, stirring evenly, and centrifuging; where, mass volume ratio of graphite-type carbon nitride/nitrogen-doped grapheme, N,N-dimethylformamide, and bismuth vanadate is 1g: 20mL: 0.25-2g; the preparation of graphite-type carbon nitride/nitrogen-doped graphene comprises (a) sieving biomass powder through 200-mesh sieve, carbonizing at 300-500°C for 2 hours under the protection of nitrogen, obtaining biochar powder; (b) mixing biochar powder and potassium carbonate in a mass ratio of 1:1-4:1, calcining at 800-1000°C for 2 hours under nitrogen protection, cooling to room temperature, and grinding into powder to obtain graphite; (c) dissolving graphite in water, adding hydrazine hydrate, stirring ultrasonically to form a mixed solution, transferring to a Teflon(polytetrafluroethylene)-lined stainless steel reactor, heating at 160-220°C for 12-30 hours, cooling to room temperature, rinsing with water and ethanol in turn, drying at 80°C, grinding to powder to obtain nitrogen-doped graphite, where the mass volume ratio of graphite, water and hydrazine hydrate is 160-640 mg:60-240mL:174-696μL; (d) placing the graphite carbon nitride precursor in the crucible, heating in air atmosphere at 500-600°C for 2-6 hours, the heating rate is 5?oC/minute, cooling to room temperature and grinding into powder to obtain graphite carbon nitride; and (e) dissolving graphite carbon nitride and sodium hydroxide in water, adding nitrogen-doped graphite, dispersing into mixed solution, moving to Teflon(polytetrafluroethylene)-lined stainless steel reaction kettle, heating at 90-180°C for 12-30 hours; rinsing cooled materials with water and ethanol in turn, drying under vacuum at 60°C, grinding into powder to obtain graphite-type carbon nitride/nitrogen-doped graphite, where the solid-liquid ratio of graphite carbon nitride, sodium hydroxide, water and nitrogen-doped graphite is 0.005-0.020mol:0.006-0.015mol:70-115mL:1.5-3g; and (B) rinsing the obtained precipitate with water and ethanol successively, drying at 60°C, and grinding to powder. An INDEPENDENT CLAIM is also included for the graphite type carbon nitride/nitrogen-doped graphene/bismuth vanadate Z type photocatalyst is prepared by above mentioned method.