▎ 摘　　要

NOVELTY - Preparation of three-dimensional porous titanium dioxide-loaded nitrogen-doped graphene sponge involves adding titanium-containing precursor to ethanol dispersion liquid containing graphene oxide, slowly adding deionized water into the ethanol dispersion liquid, stirring the mixture, subjecting the mixture to hydrothermal reaction at 180-240 degrees C for 12-48 hours, freeze-drying the solution at -80 degrees C to -75 degrees C, supplying high-purity nitrogen-containing gas into the solution in a vacuum furnace and heating the solution. USE - Preparation of titanium dioxide-loaded nitrogen-doped graphene sponge used for absorbing formaldehyde and benzene compound e.g. benzene, toluene and phenol in gases (claimed). ADVANTAGE - The method enables simple preparation of titanium dioxide-loaded nitrogen-doped graphene sponge which adsorbs large amount of formaldehyde or benzene compound. The formaldehyde or benzene compound can be degraded through the photocatalysis process under irradiation of UV light. The adsorption saturation phenomenon is avoided, the adsorption and the degradation are conducted at the same time to complete adsorption process and rapid purification of the air is realized. DETAILED DESCRIPTION - Preparation of three-dimensional porous titanium dioxide-loaded nitrogen-doped graphene sponge involves adding titanium-containing precursor to ethanol dispersion liquid containing graphene oxide, slowly adding deionized water into the ethanol dispersion liquid, stirring the mixture, subjecting the mixture to hydrothermal reaction at 180-240 degrees C for 12-48 hours, freeze-drying the solution at -80 degrees C to -75 degrees C, supplying high-purity nitrogen-containing gas into the solution in a vacuum furnace and heating the solution at 400-800 degrees C for 3-12 hours. The obtained graphene sponge contains 5-10% titanium dioxide. An INDEPENDENT CLAIM is included for usage method of titanium dioxide-loaded nitrogen-doped graphene sponge, which involves performing photocatalysis degradation of formaldehyde or benzene compound into carbon dioxide and water using the titanium dioxide-loaded nitrogen-doped graphene sponge.