▎ 摘　　要

NOVELTY - Titanium dioxide-polyethyleneimine-graphene composite adsorption degradation material is claimed. The titanium dioxide-polyethyleneimine-graphene composite adsorption degradation material is prepared by e.g. adding template agent cetyltrimethylammonium bromide and tetrabutyl titanate to deionized water, placing in magnetic stirrer, stirring, adding ethanol, refluxing at 80-100 degrees C for 2-4 hours, filtering, washing and drying, placing dried product in ethanol solution of concentrated hydrochloric acid, stirring and reacting to obtain mesoporous nano-titanium dioxide, adding mesoporous nano-titanium dioxide into ethanol, stirring uniformly, adding 3,4-dihydroxybenzoic acid under nitrogen atmosphere, stirring and reacting in dark atmosphere, filtering, washing and drying to obtain carboxylated mesoporous nano-titanium dioxide, adding carboxylated graphene into deionized water, ultrasonically dispersing uniformly, reacting at 140-180 degrees C for 4-6 hours filtering, washing and drying. USE - The titanium dioxide-polyethyleneimine-graphene composite adsorption degradation material is useful in water pollution treatment. ADVANTAGE - The titanium dioxide-polyethyleneimine-graphene composite adsorption degradation material has excellent water pollution treatment performance and improved the adsorption efficiency of chromium(6+) and methylene blue; and adsorbs methylene blue to form an adsorption degradation cycle. The method: utilizes graphene hydrogel which has a large number of active sites. DETAILED DESCRIPTION - Titanium dioxide-polyethyleneimine-graphene composite adsorption degradation material is claimed. The titanium dioxide-polyethyleneimine-graphene composite adsorption degradation material is prepared by (i) adding template agent cetyltrimethylammonium bromide and tetrabutyl titanate to deionized water in a mass ratio of 25-40:100, placing in the magnetic stirrer, stirring and reacting for 2-3 hours, adding ethanol, refluxing and reacting at 80-100 degrees C for 2-4 hours, cooling, filtering, washing and drying, placing the dried product in ethanol solution of concentrated hydrochloric acid, stirring and reacting for 24-72 hours, filtering, washing and drying to obtain mesoporous nano-titanium dioxide, (ii) adding mesoporous nano-titanium dioxide into ethanol, stirring uniformly, adding 3,4-dihydroxybenzoic acid under a nitrogen atmosphere, then stirring and reacting for 10-20 hours in the dark atmosphere, filtering, washing and drying to obtain carboxylated mesoporous nano-titanium dioxide, (iii) adding carboxylated graphene into de-ionized water, ultrasonically dispersing uniformly, moving into the reaction kettle, reacting at 140-180 degrees C for 4-6 hours, then filtering, washing and drying to obtain carboxylated three-dimensional graphene hydrogel, (iv) adding carboxylated three-dimensional graphene hydrogel to deionized water, and ultrasonically dispersing uniformly, adding N-hydroxysuccinimide, 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, then ultrasonically dispersing uniformly, adding polyethyleneimine aqueous solution, then ultrasonically reacting for 30-90 minutes, allowing to stand for 6-18 hours, centrifuging, washing and drying to obtain polyethyleneimine grafted graphene hydrogel, and (v) adding carboxylated mesoporous nano-titanium dioxide, polyethyleneimine grafted graphene hydrogel to deionized water, then ultrasonically dispersing uniformly, adding condensing agent dicyclohexylcarbodiimide, ultrasonically dispersing uniformly, refluxing and reacting in an oil bath at 110-130 degrees C for 18-36 hours, filtering, washing and drying to obtain final product.