Study On Preparation And Photothermal Application Of CuS-based Composite Materials

With the progress of science and the rapid development of human society,the greenhouse effect and the shortage of fresh water resources have become the major ecological and environmental problems.Under the background of energy shortage,solar energy is the best choose for greenhouse gas treatment and fresh water resource acquisition.In the solar energy utilization,most of the previous research focused on the ultraviolet and visible light region,but a large number of infrared light has not been fully utilized,which caused a waste of solar energy spectrum.Therefore,developing materials that can absorb near-infrared light is an important problem for solar energy utilization.The material's absorption range depends on its own band gap,which is usually narrow enough to absorb infrared light and convert it into heat,which can be used to increase the rate of greenhouse gas treatment or the rate of photothermal seawater desalination.Developing an efficient and stable photothermal material is meaningful to solve environmental problems and energy crisis.In this paper,the design of different high-performance CuS-based photothermal materials and their universality in photothermal applications are explored by designing.Firstly,the basic contents of solar-induced conversion of greenhouse gas CO2 and desalination of solar seawater,and the basic principles of solar-thermal materials are introduced.The preparation technology and properties of CuS-based photothermal materials were involved,and the materials were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray energy spectrum(XPS),Ultraviolet-visible diffuse reflectance spectrum(DRS),etc.In addition,the photothermal properties and mechanism of CuS based materials were studied.This paper studies the photothermal performance of two CuS-based photothermal materials in solar induced photothermal CO2 conversion and seawater desalination.The first is to combine the wide band gap photocatalytic material TiO2 and the narrow band gap semiconductor material CuS to synthesize CuS/TiO2 composite material to extend the light absorption range of the photocatalyst to the infrared region for the study of full spectrum CO2 conversion.The results show that 2%CuS/TiO2 exhibits the highest photocatalytic CO2 conversion performance.The rate of CO formation under full-spectrum irradiation is25.97?mol g^-1 h^-1,which is about 6 times that of TiO₂.The second is to design a porous membrane composed of the hydrophilic polymer skeleton chitin and the solar absorber CuS.The composite membrane has a desalination efficiency of more than 99%under simulated sunlight,and the maximum desalination rate is 10 kg/m²/h.