Noble Metal Silver/Palladium Nanocomposite Catalysts With Controllable Morphology And Its Catalytic Performance For Nitro Compounds

Since noble metal nanocomposite catalysts are not only an important part of many chemical synthesis,but also have huge potential applications in industrial synthesis,researchers have gradually increased the depth of their preparation and characteristics in recent decades.As we all know,the properties of metal nanocatalysts are attributed to its structure and size,and its catalytic activity and selectivity also largely depend on the size,shape and composition of the nanoparticles contained in it.The purpose of this paper is to use technical means to control the structure and morphology of nobel metal nanocrystals and to further synthesize nobel metal composite nanocatalysts to achieve the purpose of regulating their catalytic performance.In this paper,polyhedral Fe₃O₄ magnetic nanoparticles were first prepared by solvothermal method,and then the silver nanoparticles of different silver sources?silver nitrate,silver metavanadate,and silver acetate?were self-reduced and loaded onto the polyhedral Fe₃O₄ magnetic nanoparticles,as the composite catalyst has magnetic recovery characteristics.Three different morphology and size products have also been obtained.Then test its common nitro compounds in wastewater:p-nitrophenol?4-NP?and o-nitroaniline?2-NA?for their catalytic performance and reusability and test accordingly.Then four different kinds of surfactants were used:cetyltrimethylammonium bromide?CTAB?,cetyltrimethylammonium chloride?CTAC?,cetylpyridine bromide?C16Py?and ten Sodium dialkylbenzene sulfonate?SDBS?was used as a sealing agent to prepare a variety of noble metal palladium-copper bimetal composite catalysts:rhombic dodecahedron,sphere,cube and pearl chain.The copper element was further supported to obtain a single,pure,noble metal palladium composite copper bimetal nanocomposite catalyst with special morphology.Finally,the above four palladium-copper bimetal nanocomposite catalysts will be studied and discussed for the reduction catalytic performance of 2-NA and 4-NP respectively,and tested for their stable ability to be used repeatedly.The results of the palladium experiment were compared with each other.In addition,a group of samples with the best dispersion of these samples will be selected for surface enhanced Raman ?SERS?performance testing.In this paper,nanocomposite catalysts with different properties are obtained by controlling the morphology of precious metal particles.The obtained catalysts have uniform morphology,narrow size distribution and pure singleness,and the effectiveness of controllable preparation was further confirmed.The drugs used in the operation of the experiment are all environmentally friendly,this study will provid new reference materials for the controllable preparation of new noble metal composite nanocatalysts and expand the direction of in-depth research in the field of catalysis.