Preparation Of Nano-CuS/RGO Composites And Its Application In Superhydrophobic Multifunctional Textiles

Inspired by the surface of superhydrophobic lotus leaves in nature,the special wettable surface has attracted great attention of many scholars,and the theoretical basis of superhydrophobic surface has been developed rapidly.The application of superhydrophobic surface in textiles can give textiles superhydrophobic,self-cleaning and oil-water separation characteristics.Studies have shown that the preparation of superhydrophobic surfaces requires the coordination of rough micro-nanostructures and low surface energy.Generally,rough micro-nanostructures can be achieved by introducing inorganic nanoparticles on the surface of textiles.Furthermore,by using the physical and chemical properties of inorganic nano materials,the textiles could have flame retardant,UV resistant,photocatalysis and electromagnetic shielding property.As a transition metal sulfide,CuS has important application in catalysis,absorption and lithium battery.Three dimensional graphene has the characteristics of large specific surface area,high conductivity and excellent mechanical properties.CuS/RGO has excellent photocatalytic,conductive and microwave absorbing properties,which can be applied to textiles to improve the added value of textiles.Another important factor in the preparation of superhydrophobic surface is the low surface energy,which can be achieved by introducing environmentally friendly and fluorine-free organosilane,such as polydimethylsiloxane.Therefore,it is important for us to explore a simple and effective preparation process to prepare environmentally friendly super hydrophobic multi-functional textiles.The main research results of this article are as follows:（1）Preparation of nano CuS and its application in superhydrophobic multifunctional cotton fabric.Nano CuS was prepared by water bath heating method,with copper chloride dihydrate and thioacetamide as copper and sulfur sources respectively,and methanol and water as solvent.Factors such as the amount of reactants,solvent ratio,reaction time,and reaction temperature were discussed to prepare nano-CuS with controllable morphology.The nano CuS was characterized by SEM,XRD,BET and UV-Vis.CuS had a spherical structure formed by sheet stacking,hexagonal crystal structure with a specific surface area of 10.76m²/g and good absorption performance for ultraviolet and visible light.The photocatalytic performance test showed that under the irradiation of xenon lamp.The degradation for MB was 98%when nano CuS was added with H₂O₂,which had excellent photocatalytic performance.The surface of cotton fabric was treated by the CuS and PDMS.SEM,XPS and AFM were used to characterize the treated cotton fabric.The contact angle,UV resistance,self-cleaning and other properties were tested.The effect of the amount of CuS and PDMS was discussed.The contact angle was 159.3°and the amount of CuS and PDMS was 2%and 1.5%,Water droplets,milk,coffee and cola can maintain a complete spherical shape on the surface,and the treated cotton fabric had excellent Self-cleaning effect.The surface roughness Rq of the treated cotton fabric treated by PDMS was 9.7nm.However,the roughness Rq of the cotton fabric treated by CuS increased to 71.7nm,and the surface roughness increased significantly.UPF reached 535.36.UV transmittance was almost 0.Oil-water separation efficiency reached 96%.（2）Preparation,characterization and properties of CuS/RGO composites.CuS/RGO composites were prepared by a two-step hydrothermal method.XRD,Raman,XPS,SEM,BET,UV-Vis,etc.were used to characterize CuS/RGO composites,the photocatalysis and microwave absorption properties were studied.The results showed that the prepared CuS/RGO nanocomposite had the characteristics of good crystallinity,large specific surface area,and wide visible light absorption.When the RGO content was 20%,the degradation rate of 0.1g CuS/RGO composite can reach 98.6%under 120min irradiation under xenon lamp.The CuS/RGO composite still had good photocatalytic performance after 5 cycles of test.When the ratio of CuS/RGO composite material to paraffin was 1:8 and the thickness was2.5mm,the absorption performance was the best that the reflection loss reached-41.7d B.The electromagnetic shielding effect of the finished cotton fabric reached-33d B.（3）Preparation of super-hydrophobic multifunctional textiles based on nano-CuS/RGO composites.CuS/RGO@PDMS cotton fabric was prepared by combining CuS/RGO composite material with low surface energy PDMS by dip-pad-dry method.The effects of the amount of CuS/RGO,the amount of PDMS,the baking temperature and the baking time on the hydrophobicity were discussed.When the amount of CuS/RGO and PDMS were 2%,the baking time was 60minutes,and the baking temperature was 130°C,the hydrophobicity was the best,reaching 158.4°with excellent superhydrophobic properties.SEM,FIRT,XRD and XPS were used to characterize the CuS/RGO@PDMS coated cotton fabrics.The results showed that the roughness Rq of CuS/RGO@PDMS had reached 76.3nm,and the surface roughness had increased significantly.The UPF value had reached 851.2,showing excellent UV resistance.Moreover,CuS/RGO@PDMS coated cotton fabric had excellent self-cleaning and oil-water separation effects,and the oil-water separation efficiency reached 94%.The degradation rate of MB was 92%,which had good photocatalytic performance.