▎ 摘　　要

NOVELTY - Preparation of modified anatase titanium dioxide nanotube graphene hydrogel involves weighing 0.2 g anatase titanium dioxide nanotubes, adding to graphene solution, subjecting to ultrasonic stirring at room temperature, obtaining anatase titanium dioxide nanotubes and graphene oxide mixed solution, placing in 25 mL sample tube with a piston, adding 1 mL ferrous sulfate solution, ultrasonically stirring for 3 minutes, placing in a constant temperature water bath at 90 degrees C for 6 hours. USE - Preparation of modified anatase titanium dioxide nanotube graphene hydrogel used in absorption and desorption of fluorine ion in sodium fluoride solution (all claimed). ADVANTAGE - The method efficiently provides modified anatase titanium dioxide nanotube graphene hydrogel having excellent absorption and desorption effect with respect to fluorine ion, by simple method. DETAILED DESCRIPTION - Preparation of modified anatase titanium dioxide nanotube graphene hydrogel involves adding 500 mL 40% sodium hydroxide solution to 4.5 g titanium dioxide, ultrasonically treating for 3 hours, stirring in magnetic stirring device, obtaining crude product, transferring into a reactor equipped with magnetic stirring rotor, placing the reactor in a stainless steel reaction jacket filled with water bath, heating the autoclave in constant temperature water bath, removing the reactor, cooling to room temperature, centrifuging crude product in the autoclave, filtering, obtaining secondary crude product, washing using distilled water until the pH of 10-10.5, adding dilute acid to dilute the pH value to 2-2.5, adding sodium titanate, carrying out ion exchange reaction, converting sodium titanate from sodium to hydrogen, washing using distilled water, adjusting the pH to 6-6.5, adding dilute acid to dilute the pH value to 2-2.5, completely converting sodium titanate, washing using distilled water, filtering, placing the filter cake in a freeze-drying machine, freeze-drying at -60 degrees C for 24 hours, obtaining titanium dioxide nanotubes, calcining at 550 degrees C for 5.5 hours, obtaining anatase titanium dioxide nanotubes, weigh 0.50 g oxidized graphite solid powder, dissolving in 200 mL distilled water, obtaining 2.5 mg/mL graphite oxide solution, ultrasonically stirring at room temperature, obtaining graphene solution, weighing 0.2 g anatase titanium dioxide nanotubes, adding to the graphene solution, subjecting to ultrasonic stirring at room temperature, obtaining anatase titanium dioxide nanotubes and graphene oxide mixed solution, placing in 25 mL sample tube with a piston, adding 1 mL ferrous sulfate solution, ultrasonically stirring for 3 minutes, placing in a constant temperature water bath at 90 degrees C for 6 hours. An INDEPENDENT CLAIM is included for application of modified anatase titanium dioxide nanotube graphene hydrogel for removing fluorine ion in sodium fluoride solution.