▎ 摘　　要

NOVELTY - Zinc-oxide based composite photocatalyst with excellent photocatalytic performance under visible light irradiation, comprises the zinc source is zinc nitrate hexahydrate, alkali source is sodium hydroxide, the nitrogen source is urea, graphene oxide prepared from the original graphite powder, and the reagent with sulfuric acid, potassium permanganate, hydrogen peroxide (30%), diluted hydrochloric acid (5%) and de-ionized water, and using de-ionized water to wash for many times, drying at 60 degrees C for 8 hours and analyzing the morphology using as x-ray diffraction, scanning electron microscopy, ultravioletvisible light absorption spectrum, fluorescence excitation spectrum, X-ray photoelectron spectroscopy to, structure, composition and optical properties of a sample, sample the same photocatalytic performance test is under the condition of degrading dye methylene blue, absorbing the change of absorbance to the methylene blue solution to evaluate photo-catalytic properties of the sample. USE - Used as zinc-oxide based composite photocatalyst with excellent photocatalytic performance under visible light irradiation. ADVANTAGE - The method is simple, economical and environmentally-friendly; and has high yield, long life and easy popularization. DETAILED DESCRIPTION - Zinc-oxide based composite photocatalyst with excellent photocatalytic performance under visible light irradiation, comprises the zinc source is zinc nitrate hexahydrate, alkali source is sodium hydroxide, the nitrogen source is urea, graphene oxide prepared from the original graphite powder, and the reagent with sulfuric acid, potassium permanganate, hydrogen peroxide (30%), diluted hydrochloric acid (5%) and de-ionized water, where all reagents are not processed, synthesizing zinc oxide using hydrothermal method: magnetically stirring, 3 millimoles zinc nitrate hexahydrate (dispersing solution A in 30 ml deionized water, dispersing sodium hydroxide in 30 ml deionized water (Zn2+:OH-mol ratio 1:7,5) as solution B at room temperature under magnetic stirring slowly dripping the solution B to the solution A, reacting for 30 minutes, sealing the mixture in the stainless steel high pressure kettle with polyfluortetraethylene lining, raising the temperature to 180 degrees C and keeping the temperature for 9 hours, naturally cooling the high pressure kettle to room temperature, using deionized water and ethanol to wash white precipitate for many times, drying the precipitate for 8 hours in the air at 60 degrees C, preparing graphene oxide by natural graphite powder by a modified Hummers method, adding 1.2 g graphite powder with 50 ml concentrated sulfuric acid, stirring the mixture for 3 hours in the ice water bath, and slowly adding 6 g potassium permanganate, keeping the temperature below 5 degrees C and continuously stirring for 3 hours, removing the ice water bath, heating the mixture solution to 35 degrees C, stirring for 3 hours, gradually adding 90 ml ice deionized water for continuously stirring for 1 hours, raising the temperature to 95 degrees C for 1 hours, treating with 10 ml hydrogen peroxide until the mixture stops bubbling, stopping stirring and cooling the solution to room temperature and allowing to stand for one night, pouring the supernatant, filtering to obtain red brown precipitate and washed with hydrogen chloride, and dispersing the precipitate in 200 ml de-ionized water and ultrasonically treating for one day, and the uniformly pouring the solution in the dialysis bag for dialyzing for 6-7 days, centrifuging the solution and collecting the supernatant, freezing and drying the solution into powder, dispersing 2 g powder in 1000 ml deionized water ultrasonically treating uniformly to obtain 2 g/ml graphene oxide brown dispersion, preparing zinc oxide and graphene composite material using simple one-pot hydrothermal method, dissolving 3 millimoles zinc nitrate in 20 de-ionized water ultrasonically treating for 30 minutes, adding the different proportion of graphene oxide (GO) solution into the zinc nitrate solution and ultrasonically processing for 1 hour, adding sodium hydroxide solution in to zinc nitrate the solution, stirring for 1 hour, uniformly placing the mixed solution to a stainless steel high pressure kettle with polyfluortetraethylene liner of sealing, and heating up to 180 degrees C for 9 hours, washing the precipitate for many times with deionized water, the final zinc oxide-graphene sample at 60 degrees C and drying for 8 hours, where the mass ratio of graphene oxide and zinc oxide is 2 wt.%, 4 wt.%, 6 wt.%, 8 wt.% and 12 wt.%, samples are named as 2RGZ, 4RGZ, 6RGZ, 8RGZ, and 12RGZ, the photocatalytic results, was found that 8 wt.% zinc-graphene oxide composite material exhibits the highest photo-catalytic activity; preparing zinc oxide and nitrogen-doped graphene composite material using simple one-step hydrothermal method dissolving 3 g zinc nitratein an oxide graphene solution and ultrasonically processing for 1 hour, and dissolving sodium hydroxide in 20 ml deionized water (mol ratio of 1:7.5) and slowly adding to the above solution at room temperature, stirring the mixed solution for 1 hour, where urea as a nitrogen source by weight ratio of 4 wt.%, conversion and target product in nitrogen-containing quality percentage is 1.8%, adding the urea aqueous solution to the mixture, and magnetically stirring for 2 hours, placing product solution to the into the stainless steel high pressure kettle in the sealing, heating at 180 degrees C for 9 hours, collecting grey precipitate and using de-ionized water to wash for many times, drying at 60 degrees C for 8 hours and analyzing the morphology using as x-ray diffraction, scanning electron microscopy, ultravioletvisible light absorption spectrum, fluorescence excitation spectrum, X-ray photoelectron spectroscopy to, structure, composition and optical properties of a sample, sample the same photocatalytic performance test is under the condition of degrading dye methylene blue, absorbing the change of absorbance to the methylene blue solution to evaluate photo-catalytic properties of the sample.