▎ 摘　　要

NOVELTY - Preparing zinc oxide/graphene oxide (ZnO-GO)/ chitin gas gel composite material comprises (i) dispersing graphene oxide in distilled water to form an aqueous suspension, uniformly mixing with sodium hydroxide and urea, where the added amount of sodium hydroxide and urea is 15% of the total mass and the mass ratio of sodium hydroxide and urea is 11:4 and stirring for 15 minutes, dispersing chitin for1-5 hours to obtain graphene oxide/ chitin solution by repeated freeze-thawing, where the mass ratio of the chitin and graphene oxide is not less than 10; (ii) centrifuging graphene oxide/ chitin solution, collecting supernatant, adding nano- zinc oxide - graphene oxide to the collected supernatant graphene oxide/chitin solution in a mass ratio of 0.01-0.05: 1, adding vitamin C in a mass of 10% of the graphene oxide/chitin solution and performing the hydrothermal treatment at 80-95 degrees C for 1-4 hours to obtain zinc oxide/graphene oxide/ chitin composite hydrogel, washing, filtering, and drying. USE - The composite material is useful for methylene blue-containing organic wastewater ( claimed) and treating phenolic wastewater. ADVANTAGE - The composite material has photocatalytic synergy, reusability and mild preparation conditions; and reduces high concentration organic pollutants in sewage. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for use method of zinc oxide/graphene oxide/chitin gas gel composite material for methylene blue-containing organic wastewater comprising mass ratio of zinc oxide/graphene oxide/chitin complex gas gel and methylene blue is not less than 20, the concentration of methylene blue in organic wastewater is 5-50 mg/l, the visible light power is 300 W, the wavelength is 420 nm, the stirring speed is 50-300 revolutions/minutes for 1-6 hours.