▎ 摘　　要

NOVELTY - Preparation of graphene oxide-based porous photothermal material capable of generating solar steam comprises performing Hummers method to obtain graphene oxide, dispersing graphene oxide and polyvinyl alcohol in deionized water, removing air bubbles by ultrasonic, placing mixture into liquid nitrogen for freezing to obtain solidified product, freeze drying solidified product in freeze dryer to obtain graphene oxide precursor, carbonizing graphene oxide precursor to obtain aligned graphene oxide (GO)-based porous photothermal material, soaking GO-based porous photothermal material in polydiallyldimethylammonium chloride solution to obtain poly(diallyldimethylammonium chloride) (PDDA)-modified GO-1, soaking PDDA-modified GO-1 in alginate sodium salt solution and calcium chloride solution to obtain Ca2+/alginate hydrogel coating, soaking surface of Ca 2+/alginate hydrogel coating in polydiallyl dimethyl ammonium chloride, soaking in sodium perfluorooctanoate for oleophobic modification and drying. USE - The method is used for preparation of graphene oxide-based porous photothermal material capable of generating solar steam for seawater desalination or purification treatment of oily and dye containing wastewater (claimed). ADVANTAGE - The photothermal material has high solar energy conversion efficiency, excellent salt resistance and pollution resistance.