▎ 摘　　要

NOVELTY - Preparing photo-thermal water evaporation material involves putting the cotton in the Tris buffer solution with pH of 8-8.9 for dipping for 5-15 minutes, then taking out and drying. The cotton processed is soaked in the dopamine hydrochloride water solution for 5-15 minutes, taking out and dry, and later soaked the cotton processed in the hydrogen peroxide water solution of copper sulphate for 5-15 degrees centigrade taking out and dry. The cotton processed is placed in the graphene dispersion liquid for 5-15 minutes, then taking out, water washing, at last drying at room temperature to obtain the photo-thermal water evaporation material. USE - Method for preparing photo-thermal water evaporation material for for sea water desalination and sewage treatment field. ADVANTAGE - The method uses cotton as carrier, low cost, environment-friendly, and non-toxic, which has very low thermal conductivity and is a hydrophilic material fiber is a hollow structure, has capillary action can effectively absorb water graphene, has good thermal conductivity and structure stability which can enhance the photo-thermal conversion efficiency of the material poly-dopamine, has good adsorption performance and photo-thermal property and the cotton and graphene are connected together which is good for forming stable composite material.