▎ 摘　　要

NOVELTY - Preparation of photocatalytic film comprises e.g. mixing graphene oxide and urea according to the mass ratio of 1:1-1:40, reacting for 6-24 hours at 100-200 degrees C, cooling to room temperature, using 1-10% hydrochloric acid and de-ionized water to wash alternately for 5-10 times, freezing and drying the solution to obtain the nitrogen-doped graphene oxide, adding nitrogen-doped graphene oxide into the mixed solution containing ethanol and water, adding glacial acetic acid to the mixed solution to adjust the pH to 1.5-2.5 to obtain solution A, dissolving titanium dioxide in ethanol and mixing to obtain solution B, adding solution B in solution A and reacting, cooling to room temperature, washing with de-ionized water, freezing and drying to obtain the nitrogen-doped graphene oxide-titanium dioxide, mixing activated carbon powder and nitrogen-doped graphene oxide-titanium dioxide in de-ionized water, and magnetically stirring. USE - The photocatalytic film is useful for degrading dye (claimed). ADVANTAGE - The method solves the difficulty of recovering nanocatalyst, and improved the anti-pollution performance of the polymer film. The film combines light degradation performance of the nanoparticle and chemical stability of the high-molecular film, is environmentally friendly, and is suitable for industrial production and application. DETAILED DESCRIPTION - Preparation of photocatalytic film comprises (i) mixing graphene oxide and urea according to the mass ratio of 1:1-1:40, reacting for 6-24 hours at 100-200 degrees C, cooling to room temperature, using 1-10% hydrochloric acid and de-ionized water to wash alternately for 5-10 times, freezing and drying the solution to obtain the nitrogen-doped graphene oxide, (ii) adding nitrogen-doped graphene oxide obtained in step (i) into the mixed solution containing ethanol and water, adding glacial acetic acid to the mixed solution to adjust the pH to 1.5-2.5 to obtain solution A, dissolving titanium dioxide in ethanol and mixing to obtain solution B, adding solution B in solution A and reacting for 6-24 hours, cooling to room temperature, washing with de-ionized water, freezing and drying to obtain the nitrogen-doped graphene oxide-titanium dioxide, (iii) mixing the activated carbon powder and nitrogen-doped graphene oxide-titanium dioxide in de-ionized water at ratio of 1:1-1:10, magnetically stirring for 1-6 hours, placing in 80-180 degrees C oven to dry, to obtain nano-composite particles, and (iv) taking polysulfone flat film and first coating with a layer of adhesive, then placing in 80-180 degrees C oven to dry, sedimenting nanocomposite particles to the above polysulfone film and placing surface in an oven at 80-180 degrees C for drying, and obtaining film material as photo-catalytic film that can be used for degrading dye.