▎ 摘　　要

NOVELTY - The preparation of hydrogenated titanium dioxide/graphene quantum dot composite material involves (1) using dispersant polyvinylpyrrolidone in acidic environment, dispersing titanium tetraisopropoxide in ethylene glycol, obtaining titanium solution and placing it in stainless steel autoclave, washing product with distilled water and ethanol, drying to obtain yellow powdered titanium dioxide and placing it in vacuum tube furnace, carrying out annealing to obtain white flower-like titanium dioxide, (2) heating white flower-like titanium dioxide in tube furnace, annealing to obtain hydrogenated gray titanium dioxide powder, (3) mixing citric acid and urea, adding ultrasonic ultra-pure water, dialyzing supernatant against dialysis bag, freeze-drying to obtain brown powdery N-doped graphene quantum dot, (4) ultrasonically dispersing hydrogenated gray titanium dioxide and N-doped graphene quantum dots in ultrapure water, placing it in autoclave, and washing with ultrapure water and ethanol. USE - Preparation of hydrogenated titanium dioxide/graphene quantum dot composite material. ADVANTAGE - The hydrogenated titanium dioxide/graphene quantum dot composite material has higher visible light absorption, greatly improves the photocatalytic activity of the composite material, and greatly improving the degradation ability of the composite material to organic pollutants. DETAILED DESCRIPTION - The preparation of hydrogenated titanium dioxide/graphene quantum dot composite material involves (1) using dispersant polyvinylpyrrolidone in acidic environment, dispersing titanium tetraisopropoxide in ethylene glycol, stirring well to obtain titanium solution, placing titanium solution in stainless steel autoclave and reacting at 160-165 degrees C for 12-13 hours, cooling to room temperature, filtering the reaction solution, washing the product several times with distilled water and ethanol, drying to obtain yellow powdered titanium dioxide, placing yellow powdered titanium dioxide in vacuum tube furnace, carrying out annealing at 550-600 degrees C for 1.5-2 hours under air atmosphere to obtain white flower-like titanium dioxide, (2) heating white flower-like titanium dioxide in tube furnace under hydrogen atmosphere at heating rate of 2-8 degrees C/minute to 450-800 degrees C, annealing for 0.5-5 hours, cooling to room temperature to obtain hydrogenated gray titanium dioxide powder, (3) mixing citric acid and urea in a mass ratio of 1:1.1 to 1:1.2 for 20-25 minutes, heating to 175-180 degrees C, the mixed powder melts and slowly turns from white to yellow solution, cooling the solution to room temperature, adding ultrasonic ultra-pure water for 1.5-2 hours, centrifuging, cooling supernatant, dialyzing supernatant against dialysis bag for 40-48 hours, freeze-drying to obtain brown powdery N-doped graphene quantum dot, (4) ultrasonically dispersing hydrogenated gray titanium dioxide and N-doped graphene quantum dots in ultrapure water and placing in autoclave, maintaining temperature at 115-120 degrees C for 5.5-6 hours, cooling to room temperature, filtering and washing several times with ultrapure water and ethanol, and drying.