▎ 摘　　要

NOVELTY - Binary composite material which is represented by RTiO2/rGO, where the R group represents a basic group containing lone pair electrons, TiO2 represents titanium dioxide, and rGO represents graphene oxide. USE - The binary composite material is used for catalyzing and removing aldehyde by visible light. ADVANTAGE - The material introduces basic group containing lone pair electrons, preferably amino group, basic group containing lone pair electron can be used as chemical adsorption site, increases the formaldehyde concentration of the surface of the catalyst, and improves the formaldehyde photocatalyst of the surface of the surface is the efficient way of improving the catalytic performance, is good for improving the photo-catalytic decomposition efficiency, the photo-catalytic performance. The binary composite material is a photo-catalytic composite material with higher formaldehyde degradation rate and better stability under the air medium. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a preparation method of binary composite material, comprising reacting titanium dioxide with a reagent that provides basic groups containing lone pair electrons to prepare R-titanium dioxide with positive surface potential, preparing graphene oxide with negative surface potential, mixing R-titanium dioxide with positive surface potential and graphene oxide with negative surface potential, adding hole sacrificial agent, and reacting to obtain R-titanium dioxide/graphene oxide.