▎ 摘　　要

NOVELTY - Oxidation graphene-palladium salt composite ink comprises potassium hexachloropalladate aqueous solution, aqueous solution of oxidizing, graphene hydroxide aqueous solution and acrylic resin aqueous solution USE - Oxidation graphene-palladium salt composite ink is used for multi-level porous graphene palladium evaporator used in water treatment of solar energy driving (all claimed). ADVANTAGE - The oxidation graphene-palladium salt composite ink has fast evaporation and purification speed of solar energy driven sewage, good anti-salt performance, good performance of catalytic pollutant, circulating application has good stability, and can catalyze the left pollutant at the same time of evaporating and producing water. The multi-level porous structure effectively promotes the transmission of the related substance of the catalytic reaction and the escape of the water vapour. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a multi-level porous graphene-palladium evaporator, which comprises oxidized graphene-palladium salt composite ink; and (2) a preparation method of the multi-level porous graphene-palladium evaporator, which involves obtaining the substrate, putting the oxidized graphene-palladium salt composite ink into the 3 D printer syringe, setting the 3 D printer parameter, performing the 3 D printing on the substrate to obtain the oxidized graphene-palladium salt composite hydrogel, subjecting oxidized graphene-palladium salt composite hydrogel for freezing dry 1-48h to obtain the oxidized graphene-palladium salt composite gas gel, adding oxidized graphene-palladium salt composite gas gel in inert gas atmosphere, carrying out high temperature calcining to obtain the multi-stage porous graphene-palladium evaporator.