Study On The Preparation Of Copper Foam-based Porous Filmand Its Application In Light Conversion

With the severe shortage of water resources,clean water production technology has been rapidly developed.Solar-driven water evaporation has received great attention because of its industrial potential for clean water production,and solar-driven water evaporation needs to have solar-driven water evaporation excellent photothermal materials to be applied in practice.Copper Foam has a porous structure,low price,and high mechanical strength,which creates good conditions for the solar-driven water evaporation application test of Copper Foam.Therefore,in this paper,through the growth of CuO/Cu₂O nano-film on the porous copper foam surface and the coating of graphene oxide,a multifunctional composite material with excellent photothermal and photocatalytic properties was prepared.Taking into account the influence of pores and thickness on the photothermal performance,CuO/Cu₂O nano-films were grown on the surface of Copper Foam with different pore sizes and thicknesses and photothermal tests were carried out.The experimental results showed that the specifications were 60 PPI and the thickness was 3 mm.The Copper Foam is conducive to obtaining excellent solar-driven water evaporation performance.The research results obtained in this paper provide an important reference for the design of advanced photothermal and photocatalytic materials,and have potential application value in the field of seawater desalination and water pollution control.The specific research content and main conclusions are as follows:(1)CuO/Cu₂O nano-films were prepared on the surface of Copper Foam by chemical oxidation method,and the influence of CuO/Cu₂O on the solar-driven water evaporation performance and photocatalytic performance of Copper Foam was investigated.The research results show that:because the band gaps of CuO and Cu₂O are 2.0 e V and 1.4 e V,respectively,this helps to obtain better light absorption in the visible light region;in addition,CuO/Cu₂O nano-films can significantly change the surface water conductivity of the Copper Foam,thereby Accelerate the evaporation of water,and the water evaporation efficiency is as high as85.38%;in addition,under sunlight,electron-hole pairs are generated inside the CuO/Cu₂O nano-film,which further decomposes rhodamine B and realizes the improvement of photocatalytic performance.In addition,this thesis also grows CuO/Cu₂O nano-films on Copper Foam surfaces of different specifications,and characterizes its solar-driven water evaporation performance.The experimental results show that the Copper Foam with a specification of 60 PPI and a thickness of 3 mm is compounded After CuO/Cu₂O,solar-driven water evaporation has the best performance.(2)On the basis of the above research,in order to further improve the solar-driven water evaporation performance of the material,the sample was further modified,that is,graphene oxide(GO)was coated on CuO/Cu₂O by a physical coating method.surface.Because graphene oxide has excellent absorption in the near-infrared region,Cu@CuO/Cu₂O/GO has better solar absorption than Cu@CuO/Cu₂O In addition,the composite of graphene oxide further improves the hydrophilicity of the material.Thanks to the enhancement of light absorption and hydrophilicity,the water evaporation efficiency of the sample after graphene oxide composite reaches 96.64%.In addition,graphene oxide has excellent adsorption performance,and its composite with CuO/Cu₂O can improve the separation efficiency of photogenerated electron-hole pairs,which further improves the photocatalytic performance of the sample.