▎ 摘　　要

NOVELTY - Silver doped manganese dioxide-nitrogen doped graphene aerogel (SMNG) evaporator comprises a nitrogen-doped graphene aerogel as a carrier, graphene doped with silver graphene oxide nano-particles loaded with silver-doped manganese dioxide nano-particles, and finally forming an SMNG evaporator. USE - The evaporator is useful for converting solar photothermal steam. ADVANTAGE - The evaporator: has very high steam water rate and high photo-thermal conversion efficiency; adopts silver-doped manganese dioxide nano particles, which increase the steaming rate and the light-to-heat conversion efficiency, the light-to-heat conversion efficiency is high, and the sewage treatment efficiency is good. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing silver doped manganese dioxide-nitrogen doped graphene aerogel (SMNG) evaporator comprising (1) completely dissolving the magnesium sulfate and potassium permanganate in water, introducing it into the reaction kettle to react, obtaining suspension, washing with ethanol aqueous solution and drying to obtain manganese dioxide, (2) adding the silver nitrate and manganese dioxide into the ethanol aqueous solution, ultrasonically dispersing them uniformly to obtain the suspension, placing the suspension under the xenon lamp to irradiate, ultrasonically obtaining precipitate, vacuum drying to obtain the silver-doped manganese dioxide nano particles, (3) dispersing the oxidized graphene and urea in water, placing in the high pressure hydrothermal reaction kettle, reacting for 8-16 hours at 140-200C, naturally cooling to room temperature, liquid nitrogen freezing, vacuum drying, obtaining graphene aerogel doped with nitrogen, (4) dispersing the silver-doped manganese dioxide nanoparticles in water, dripping into the nitrogen-doped graphene gel, naturally depositing, drying to obtain graphene gas gel doped with nitrogen of manganese dioxide nanoparticles doped with silver, namely, SMNG evaporator.