▎ 摘　　要

NOVELTY - A gold nanoparticle/graphene three-dimensional photothermal conversion material is prepared by preparing gold nanoparticle via chemical reduction method, preparing graphene oxide via modified Hummers' method, grafting with silane coupling agent, adding gold nanoparticle, obtaining gold nanoparticle/graphene oxide nano solution, molding, and freeze drying. USE - Method for preparing gold nanoparticle/graphene three-dimensional photothermal conversion material used for photothermal conversion device for heating water into water vapor for water purification purposes (claimed). ADVANTAGE - The product can efficiently convert light energy into heat energy, can quickly heat water into water vapor, achieves water purification purposes, and realizes various functions including seawater desalination, fractionation, sterilization, sewage treatment.