Solar interface evaporation performance of Cu-Fe3O4 nanoparticle film coupled with thermal insulation materials

In order to improve the evaporation efficiency of solar-driven interface water, Cu-Fe 3 O 4 nanoparticles were synthesized in this work, and nanoparticle films with excellent light absorption properties were prepared by vacuum filtration. Benefiting from the combination of the nanoparticle film and the thermal insulation materials, nanoparticle film coupled with thermal insulation materials exhibits good evaporation performance. Effects of the type of thermal insulation materials (Ethylene Vinyl Acetate Copolymer   (EVA), Polyvinyl Alcohol (PVA), Polystyrene (PS)), the superficial density of nanoparticles (0 g/m 2 , 0.4 g/m 2 , 0.8 g/m 2 and 1.2 g/m 2 ) and the radiation intensity (2 sun, 3 sun, 4 sun) on the evaporation characteristic were studied. Results descripted that when the radiation intensity of 2 sun is used, the interfacial structure composed of the nanoparticle film with a superficial density of 1.2 g/m 2 and the thermal insulation material EVA has the best evaporation performance (evaporation rate is 2.19 kg/m 2 /h, evaporation efficiency is 68.62 %, thermal efficiency is 84.68 %). Although the addition of thermal insulation material reduces the temperature rise of water, it improves the evaporation efficiency of nanoparticle film. This paper provides a solar interface evaporation method for photothermal evaporation.