Ionic Liquid Mediated Synthesis Of Copper-based Nanoparticles And Applications In Catalysis

In this paper,hydrophobic ionic liquids were synthesized,and the preparation and properties of Cu based nanoparticles in ionic liquids without functional groups and ionic liquids with functional groups were studied.The main research contents and results are as follows:（1）First,in this work,a two-phase system composed of hydrophobic ionic liquid（IL）and water phases was introduced to prepare copper sulfide（CuS）nanoparticles.It was found that CuS particles generated from the interfaces of carboxyl-functionalized IL and sodium sulfide（Na₂S）aqueous solution were prone to aggregate into nanoplates and that produced from the interfaces of carboxyl-functionalized IL and thioacetamide（TAA）aqueous solution tended to aggregate into nanospheres.Both CuS nanoplates and nanospheres exhibited good absorption ability for the ultraviolet and visible light.Furthermore,the CuS nanoplates and nanospheres showed highly efficient photocatalytic activity in degrading the rhodamine B（Rh B）solution.Compared with the reported CuS nanostructures,the CuS nanoparticles prepared by this work could degrade Rh B under natural sunlight irradiation.Moreover,the production of CuS from the interfaces of hydrophobic IL and water phases had the advantages of mild reaction conditions and ease to operation.（2）Secondly,in this paper,a series of nano-CuO with controlled morphology were synthesized by changing the concentration of Na OH and the reaction temperature in the ionic liquid[C₁C₈im]NTf₂/water two-phase interface system.In this paper,the synthesized nano-CuO was characterized by powder X-ray diffraction（XRD）,transmission electron microscopy（TEM）and field emission scanning electron microscopy（SEM）.It was found through experiments that ionic liquid,the concentration of Na OH,and reaction temperature all affected the crystal structure and morphology of nano-CuO.The catalytic activity of nano-CuO was determined by the catalytic oxidation of furfural to furoic acid by the synthesized nano-CuO.The results showed that the concentration of Na OH and the reaction temperature of the synthesized nano-CuO,the amount of furfural,the reaction time and the reaction temperature of the nano-CuO catalyzed oxidation of furfural all affected the yield of furfural.The advantage of using an ionic liquid as a medium is that the ionic liquid acts as an intermediary,after Cu²⁺enters the ionic liquid phase,the reaction rate becomes slower and the product forms a crystal form.In addition,the viscosity of the ionic liquid is large,which reduces the aggregation phenomenon and produces finer and more uniform nanoparticles.The prepared nanoparticle has good monodispersity and surface property,and the nanoparticle product is single,its distribution is more uniform,and it has better catalytic activity.