▎ 摘　　要

NOVELTY - Preparing a cerium-doped titanium dioxide/graphene aerogel comprises (i) adding ultrapure water into graphite oxide, ultrasonicating to obtain tan oxide uniform graphene solution, centrifuging and collecting upper centrifugation solution to obtain graphene oxide solution; (ii) (ii.a) adding tetrabutyl titanate to absolute ethanol, stirring to obtain solution A; (ii.b) mixing anhydrous ethanol, ultrapure water and lanthanum nitrate hexahydrate to obtain solution B; (ii.c) adjusting pH of solution B and adding solution B into solution A, stirring, then allowing to stand to obtain gel; and (ii.d) drying the gel, grinding to obtain powdered material, placing in muffle furnace, calcining to obtain antimony doped titanium dioxide; (iii) (iii.a) adding cerium-doped titanium dioxide into graphene oxide solution, stirring to obtain mixed solution C; and (iii.b) adding mixed liquid C into hydrothermal reaction kettle, placing in an oven to obtain hydrothermal reaction product and freeze drying. USE - The cerium-doped titanium dioxide/graphene aerogel is useful for degrading wastewater containing phenol. DETAILED DESCRIPTION - Preparing a cerium-doped titanium dioxide/graphene aerogel comprises (i) adding ultrapure water into the graphite oxide, then ultrasonicating for 1-6 hours at an ultrasonic power of 30-60 kHz to obtain tan oxide uniform graphene solution, centrifuging the tantalum oxide graphene solution at a centrifugal speed of 1000-5000 rotations/minute for 3-10 minutes, and collecting the upper centrifugation solution to obtain a graphene oxide solution having a concentration of 1.5-3.5 mg/ml and the volume ratio of the mass of the graphite oxide and ultrapure water is 0.24-0.64 g:160 ml; (ii) (ii.a) adding tetrabutyl titanate to absolute ethanol at a stirring speed of 500-1000 rotations/minute, then stirring for 3-8 minutes at a stirring speed of 500-1000 rotations/minute to obtain solution A, where the volume ratio of tetrabutyl titanate to absolute ethanol is 0.8-1.2:1; (ii.b) mixing anhydrous ethanol, ultrapure water and lanthanum nitrate hexahydrate to obtain solution B, where the volume ratio of lanthanum nitrate hexahydrate to anhydrous ethanol is 0.01-0.20 g:20 ml and the volume ratio of the lanthanum nitrate hexahydrate to ultrapure water is 0.01-0.20 g:6 ml; (ii.c) adjusting the pH of the solution B to 2-5 by using an acid having a concentration of 0.01-0.10 mol/l to obtain solution B having a pH of 2-5 and drop wisely adding the solution B having a pH of 2-5 into the solution A at a dropping rate of 1-3 drops/second, stirring the reaction at a stirring speed of 500-1000 rotations/minute for 20-40 minutes, then allowing to stand for 24-48 hours to obtain a gel and solution A and solution B having a pH of 2-5 with the volume ratio of 20:26-30 and the acid is citric acid, acetic acid or nitric acid; and (ii.d) drying the gel in a vacuum drying oven at a temperature of 60-80 degrees C, then grinding to obtain powdered material, placing the powdered material in a muffle furnace, where the muffle furnace temperature increases rate from 2-3 degrees C/minutes to 400-700 degrees C, then calcining at a temperature of 400-700 degrees C for 1-6 hours to obtain antimony doped titanium dioxide and the particle size of the powdered material is 20-400 nm; (iii) (iii.a) adding a cerium-doped titanium dioxide into the graphene oxide solution at a concentration of 1.5-3.5 mg/ml, then stirring the reaction at a speed of 500-1000 rotations/minute for 2-4 hours to obtain mixed solution C, where the volume ratio of the cerium-doped titanium dioxide to the graphene oxide solution having a concentration of 1.5-3.5 mg/ml is 0.5-2g:20 ml; and (iii.b) adding the mixed liquid C into the hydrothermal reaction kettle, then placing the hydrothermal reaction kettle in an oven at a temperature of 140-200 degrees C for hydrothermal reaction for 6-12 hours to obtain hydrothermal reaction product and freeze drying the hot reaction product in a vacuum freeze dryer at -70 to -90 degrees C for 12-24 hours. An INDEPENDENT CLAIM is also included for degrading wastewater containing phenol comprising adjusting the pH of phenol wastewater to 3-6 with a phenol concentration of 50-250 mg/ml, then adding the cerium-doped titanium dioxide/graphene aerogel, stirring at 500-1000 rotations/minutes in the dark for 30-60 minutes, then pulverizing the phenol wastewater by using a 300 W xenon lamp, filtering through a filter to absorb wavelength of 400 nm light for 0.5-3 hours to obtain treated phenol wastewater, where the 300 W xenon lamp is at a distance from the phenol wastewater level of 8-12 cm and the mass ratio of the cerium-doped titanium dioxide/graphene aerogel to the phenol wastewater having a phenol concentration of 50-250 mg/ml is 0.05-0.3 g:100 ml.