▎ 摘　　要

NOVELTY - Composite hydrogel comprises a graphene composite hydrogel intercalated with porous molybdenum sulfide nanoflowers. USE - Composite hydrogel. ADVANTAGE - The composite hydrogel has antibacterial biological pollution performance and good stability, realizes efficient sea water desalination, provides solution for sustainable clean water production. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing a composite hydrogel, which involves adding molybdenum disulfide nanoparticles to the graphene oxide solution, where the mixed solution is obtained through ultrasonic treatment, adding reducing agent, ultrasonicating, and reacting to obtain a composite hydrogel molybdenum sulfide/GH; (2) a method for preparing a composite aerogel, which involves freeze-drying the composite hydrogel; and (3) a composite hydrogel-based self-water supply type photothermal device, which comprises a composite hydrogel and a self-water supply system CHTS.