▎ 摘　　要

NOVELTY - Chitosan graphene-copper-copper iron oxide composite photocatalyst comprises raw materials comprising chitosan graphene-copper-copper iron oxide composite photocatalyst. USE - The chitosan graphene-copper-copper iron oxide composite photocatalyst is useful for producing hydrogen from printing and dyeing waste liquid and degrading organic matter in wastewater (claimed). ADVANTAGE - The composite photocatalyst is prepared by safe method, and is environmentally-friendly and economical. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the chitosan graphene-copper-copper iron oxide composite photocatalyst, involving (a) taking dry chitosan powder, heating at 550-900 degrees C under nitrogen atmosphere to obtain chitosan carbon product, mixing chitosan carbon product with potassium acetate, and heating to obtain chitosan graphene, (b) separately dissolving cupric nitrate and ferric nitrate, dripping 100-200 ml 2 M citric acid solution at a ratio of 1:(1-4), adding 1-5 g chitosan graphene, heating at 70-90 degrees C constant temperature, stirring for one hour to form a precursor solution, placing in an oven at 120-150 degrees C to evaporate the water to obtain copper iron oxide colloid, placing the colloid in a muffle furnace at 400-600 degrees C for high-temperature calcination, and continuously passing air to ensure the obtained product has copper iron oxide having a stoichiometric ratio of copper and iron of 1:(1-4) to obtain chitosan graphene-copper iron oxide composite photocatalyst, and (c) adding 1-5 g polyethylene glycol as a dispersant in 60-100 ml printing and dyeing wastewater solution containing 10-20 ml lactic acid, adding 2 mmol/l 1-20 ml copper acetate solution, 0.05-5 g copper ferrite and 1-5 g chitosan graphene, stirring, cooling, sealing, evacuating, and illuminating to obtain the in-situ synthesized chitosan graphene-copper-copper iron oxide composite photocatalyst.