▎ 摘　　要

NOVELTY - Preparing phosphor-based graphene chitin gel photothermal film involves using phosphorus-based graphene and chitin as raw materials, packing and combining phosphorus-based graphene with chitin in an alkaline solution system, and dissolving through a freezing-thawing process, and fusing negatively charged phosphorus-based graphene and positively charged chitin tightly, and then scraping/coating/spraying to form a film. USE - Method for preparing phosphor-based graphene chitin gel photothermal film in the field of seawater desalination and sewage including sewage oil-water mixture and dye wastewater treatment (all claimed). ADVANTAGE - The method introduces biological material chitin into the field of light and hot water treatment for the first time. The prepared gel photothermal film has high efficiency of light and hot water evaporation and can ensure seawater desalination and sewage treatment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for performing photothermal water treatment, which involves putting the phosphor-based graphene chitin gel photothermal film on the circular foam layer to obtain a phosphor-based graphene chitin photothermal film/foam layer assembly, putting the phosphor-based graphene chitin photothermal film/foam layer assembly on the surface of seawater that needs to be desalinated or the sewage that needs to be treated, and carrying out the seawater evaporation or sewage purification under simulated sunlight.