▎ 摘　　要

NOVELTY - Hollow spherical composite material comprises a polymer material and a carbon material. The polymer material is polyacrylonitrile, polypropylene, polystyrene, polycarbonate, polyurethane, or nylon. The carbon material is carbon black, amorphous carbon, graphite, graphene, or graphene oxide. The composite material is formed by extruding and foaming composite material. USE - The hollow spherical composite material is used for photothermal seawater desalination, or sewage treatment (claimed). ADVANTAGE - The hollow spherical composite material: can reduce the problem of reduced light-to-heat conversion efficiency caused by salting out during seawater desalination; exhibits high-efficiency light-to-heat conversion efficiency and evaporation efficiency; and treats wastewater containing organic pollutants and metal ions to obtain drinking water that meets WHO standards. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the hollow spherical composite material, comprising using organic solvents to dissolve polymer materials, dispersing the carbon material with suitable organic solvent, uniformly mixing, adding ammonium carbonate and uniformly mixing, placing the final mixture into a syringe, and slowly dropping the solution into deionized water at preset temperature through needle to form hollow spherical.