▎ 摘　　要

NOVELTY - Graded three-dimensional porous graphene/titanium dioxide photocatalyst comprises interconnected framework of macroporous three-dimensional graphene and mesoporous titanium dioxide nanoparticles. The titanium dioxide nanoparticles are dispersed on graphene nanosheets, and the graphene nanosheets are coated with the titanium dioxide microspheres, where the graphene macropores are filled with nanosilica microspheres, and the titanium dioxide is pure anatase type crystal. USE - The method is useful for producing graded three-dimensional porous graphene/titanium dioxide photocatalyst. ADVANTAGE - The method provides the three-dimensional structure porous graphene/titanium dioxide photocatalyst: prevents the stacking of graphene sheets, while providing good dispersion of titanium dioxide nanoparticles; is highly stable; and exhibits superior photocatalytic performance with high surface area and improved adsorption. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing the graded three-dimensional porous graphene/titanium dioxide photocatalyst, comprising (a) preparing graphite oxide using Hummers method by dissolving graphite oxide in deionized water and ultrasonically dispersing to obtain an aqueous solution of graphene oxide, (b) adding isopropyl titanate and hexadecylamine to absolute ethanol and adding aqueous potassium chloride solution, mixing and stirring the solution at room temperature for 16-20 hours, filtering the solution, repeatedly washing the filtered solution with ethanol, and drying to obtain titanium oxide precursor, (c) dissolving the titanium oxide precursor of step (b) in ethanol, ultrasonically dispersing, adding the aqueous solution of graphene oxide obtained in step (a) and aqueous ammonia solution to obtain a mixed solution, ultrasonically dispersing the mixed solution and transferring to a hydrothermal reaction vessel and reacting at 120-180 degrees C for 12-18 hours, (d) cooling the resulting reaction product to room temperature, filtering and washing with anhydrous ethanol, and then freeze-drying, and (e) drying the freeze-dried product at 500 degrees C by subjecting to heat treatment in an inert atmosphere in a tubular furnace for 2-3 hours to obtain the graded three-dimensional porous graphene/titanium oxide photocatalyst.