▎ 摘　　要

NOVELTY - Method for preparing magnetic graphene composite titanium dioxide nanomaterial, involves (i) preparing graphite oxide, (ii) preparing magnetic nuclear ferrite nickel, and (iii) preparing magnetic graphene composite titanium dioxide by adding a certain volume of absolute ethanol to 100 ml beaker at normal temperature, dripping a certain volume of tetra-n-butyl titanate under magnetic stirring process for 10 minutes, adding an acid, and continuously stirring for 10 minutes to obtain a solution (A), adding a required amount of nickel ferrite to a certain volume of deionized water, finally adding graphite oxide, ultrasonically treating to obtain a solution (B), adding the solution (B) to the solution (A), ultrasonically treating for 30 minutes, transferring to a 100 ml hydrothermal reactor, reacting at 80-120 degrees C for 18-22 hours, filtering while hot, washing, drying, and grinding to obtain the product. USE - Method for preparing magnetic graphene composite titanium dioxide nanomaterial. ADVANTAGE - The method is easy to control reaction conditions, requires low equipment, and low energy consumption, does not require high-temperature calcination, reduces synthesis costs, and has excellent market prospect, and the composite titanium dioxide nanomaterial has excellent photocatalytic performance, is convenient for recycling, can be reused, and improves economic benefits. DETAILED DESCRIPTION - Method for preparing magnetic graphene composite titanium dioxide nanomaterial, involves (i) preparing graphite oxide by adding 2 g natural graphite and 1 g sodium nitrate to 250 ml three-necked flask at room temperature, and cooling to 0 degrees C, dripping 50 ml concentrated sulfuric acid into the three-necked flask and completely stirring for 30 minutes, adding 0.3 g potassium permanganate and fully stirring for 30 minutes, adding 7 g potassium permanganate into the three-necked flask in three batches within 1 hour, removing the ice bath, heating to 35 plus minus 3 degrees C with a water bath, and uniformly stirring for 2 hours to obtain a brown suspension, dripping 90 ml deionized water to the three-necked flask, and increasing the temperature sharply to 90 degrees C, reacting for 15 minutes, adding a mixed solution of 7 ml hydrogen peroxide and 55 ml ultrapure water at 45 degrees C to obtain a golden yellow graphite oxide dispersion, which is filtered while hot, washing to neutrality, and drying to obtain graphite oxide, (ii) preparing magnetic nuclear ferrite nickel by taking a certain mass of nickel salt and iron salt of formula (I): n(Ni(2+)):n(Fe(3+)) of 1:2, and dissolving in deionized water to obtain solution (A), dissolving a certain mass of sodium hydroxide in deionized water to obtain solution (B), dripping the solution (B) into the solution (A), vigorously stirring for 20 minutes, transferring to 100 ml hydrothermal reactor, reacting at 180-220 degrees C for 10-12 hours, naturally cooling, separating in a magnetic field, washing with water 3 times, drying at 200 degrees C for 4 hours, and grinding to obtain nickel ferrite powder, and (iii) preparing magnetic graphene composite titanium dioxide by adding a certain volume of absolute ethanol to 100 ml beaker at normal temperature, dripping a certain volume of tetra-n-butyl titanate under magnetic stirring process for 10 minutes, adding an acid, and continuously stirring for 10 minutes to obtain a solution (A), adding a required amount of nickel ferrite to a certain volume of deionized water, finally adding graphite oxide, ultrasonically treating to obtain a solution (B), adding the solution (B) to the solution (A), ultrasonically treating for 30 minutes, transferring to a 100 ml hydrothermal reactor, reacting at 80-120 degrees C for 18-22 hours, filtering while hot, washing, drying, and grinding to obtain the product.