▎ 摘　　要

NOVELTY - Use of graphene-based nano-composite material is claimed for repairing petroleum hydrocarbon polluted soil. The method involves adding graphite powder and sodium nitrate to concentrated sulfuric acid and mixing uniformly, stirring for 10-15 minutes in an ice bath, keeping the temperature below 5 degrees C, and adding potassium permanganate to the solution. The temperature is kept below 10 degrees C for 30 minutes, then heated the solution to 40 degrees C, and reacted in a water bath for 60-90 minutes. The deionized water is added to the solution and stir quickly for 5 minutes, added hydrogen peroxide solution to the solution, poured the solution into a dilute aqueous hydrochloric acid solution, stirred and kept to remove the supernatant. The remaining solution is air-dried for 10-12 hours to obtain graphite oxide. The graphite oxide is added to water, biochar is added to the water, and the mixture is added to the autoclave for 12 hours. USE - The graphene-based nano composite material is useful in repairing petroleum hydrocarbon polluted soil. ADVANTAGE - The graphene-based nano composite material absorbs the radiation energy of ultraviolet light whose wavelength is lower than 387 nanometer and generates high activity electron and electron-cavity by titanium dioxide, uses the large specific surface area to absorb the dissolved oxygen, hydroxide radical in soil, organic pollutant and water molecule, so as to generate a series of chemical reaction on the surface, finally degrades the organic pollutant to generate hydroxyl free radical and superoxide ion. DETAILED DESCRIPTION - Use of graphene-based nano-composite material is claimed for repairing petroleum hydrocarbon polluted soil. The method involves adding graphite powder and sodium nitrate to concentrated sulfuric acid and mixing uniformly, stirring for 10-15 minutes in an ice bath, keeping the temperature below 5 degrees C, and adding potassium permanganate to the solution. The temperature is kept below 10 degrees C for 30 minutes, then heated the solution to 40 degrees C, and reacted in a water bath for 60-90 minutes. The deionized water is added to the solution and stir quickly for 5 minutes, added hydrogen peroxide solution to the solution, poured the solution into a dilute aqueous hydrochloric acid solution, stirred and kept to remove the supernatant. The remaining solution is air-dried for 10-12 hours to obtain graphite oxide. The graphite oxide is added to water, biochar is added to the water, and the mixture is added to the autoclave for 12 hours. The temperature is set at 200-220 degrees C, the mixture is filtered to obtain a black solid, and the black solid is air-dried for 10-12 hours, and obtained carbonized graphene. The carbonized graphene is added to deionized water, ultrasonically disperse for 1 hour, added nano-titanium dioxide to ionized water, heated the mixture in a water bath to 50 degrees C, and added sodium hydroxide solution dropwise. The mixed solution is put into a vacuum drying oven for drying, and then ground after drying to obtain a graphene-based nanocomposite material. The soil contaminated by petroleum hydrocarbons are dried and crushed, and screen the crushed soil through a screen to remove impurities such as stones in the soil contaminated by petroleum hydrocarbons. The water is added to the soil contaminated by petroleum hydrocarbons and stirred to make the soil contaminated by petroleum hydrocarbons moist. The iron powder, graphene-based nanocomposite materials and magnesium oxide are added to the soil contaminated by wet petroleum hydrocarbons and stirred and mixed. The mixed soil is stirred 2-4 times a day and irradiated with ultraviolet light. The petroleum hydrocarbon content in the soil to be polluted by petroleum hydrocarbon is not higher than the standard value, that is, the remediation of the soil contaminated by petroleum hydrocarbon is completed.