▎ 摘　　要

NOVELTY - Heterojunction reduced graphene oxide/graphitized -carbon nitride aerogel, obtained by taking graphitized carbon nitride, graphene oxide and Ethylenediaminetetraacetic acid as main raw materials, after graphitized -carbon nitride is modified into modified graphitized carbon nitride, mixing graphitized -carbon nitride and graphene oxide in ethylenediaminetetraacetic acid, forming an aerogel of reduced graphene oxide and modified graphitized carbon nitride with heterojunction structure, in which, the effect of modifying carbon nitride to graphitized -carbon nitride is to achieve uniform dispersion of graphitized -carbon nitride and graphene oxide, and building a heterojunction structure, the role of graphene oxide in the technical solution is to use conductivity to suppress the electron-hole recombination of graphitized -carbon nitride, and the microscopic morphology of the obtained heterojunction structure graphene oxide/graphitized -carbon nitride airgel is rough. USE - Used as a heterojunction reduced graphene oxide/graphitized -carbon nitride aerogel. ADVANTAGE - The aerogel: has the phase transition temperature of 38.53-61.06℃, and the latent heat of phase transition of 165-182 J/g., with a photothermal conversion efficiency of 90-96%, a phase change material loading rate of 90-98 wt.%. DETAILED DESCRIPTION - Heterojunction reduced graphene oxide/graphitized -carbon nitride aerogel, obtained by taking graphitized carbon nitride, graphene oxide and Ethylenediaminetetraacetic acid as main raw materials, after graphitized -carbon nitride is modified into modified graphitized carbon nitride, mixing graphitized -carbon nitride and graphene oxide in ethylenediaminetetraacetic acid, forming an aerogel of reduced graphene oxide and modified graphitized carbon nitride with heterojunction structure, in which, the effect of modifying carbon nitride to graphitized -carbon nitride is to achieve uniform dispersion of graphitized -carbon nitride and graphene oxide, and building a heterojunction structure, the role of graphene oxide in the technical solution is to use conductivity to suppress the electron-hole recombination of graphitized -carbon nitride, and the microscopic morphology of the obtained heterojunction structure rGO/g-CN airgel is that the surface is rough, and the overall pores are evenly distributed, forming a continuous three-dimensional grid and showing a regular honeycomb porous structure, and has the effect of improving the utilization rate of visible light and improving the efficiency of light-to-heat conversion. INDEPENDENT CLAIMS are also included for: a method for preparing Heterojunction reduced graphene oxide/graphitized -carbon nitride aerogelcomprising (1) preparing modified graphitized carbon nitride, under a certain condition, modifying the carbon nitride to obtain the modified graphitized carbon nitride, abbreviated as g-CN, (2) preparing heterojunction structure rGO/g-CN gas gel, mixing the g-CN with the graphene oxide, adding ethylenediamine to obtain the reaction liquid, then carrying out hydro-thermal reaction with a certain condition, after the reaction of the product after washing at room temperature, freezing and drying under a certain condition to obtain the Heterojunction reduced graphene oxide/graphitized -carbon nitride aerogel; and an use method of a heterojunction structure reduced graphene oxide/graphitized -carbon nitride aerogelas a phase change material comprising using the vacuum impregnation method, impregnating polyethylene glycol into the heterojunction structure rGO/g-CN airgel at a certain mass ratio, and obtaining the heterojunction structure reduced graphene oxide/graphitized -carbon nitride aerogel-based composite phase change material.