▎ 摘　　要

NOVELTY - Preparing a photothermal sponge involves dissolving the graphene material in water, sonicating, and preparing a certain concentration of graphite dispersion solution, soaking the porous sponge in the graphite dispersion solution, and performing ultrasonic treatment to absorb the graphite dispersion solution, adding permanganic acid or permanganate to the solution, controlling the concentration of permanganate, reaction temperature and time to obtain the sample, after drying. USE - Method for preparing photothermal sponge used as air purification material (claimed). ADVANTAGE - The method enables to prepare photothermal sponge is helps to enhances the scattering and absorption of enhanced light in the pores, and has efficient use of solar energy and rapid heat production.