Nano Metal Resin Polymer Composite Preparation And Performance Study

Nano-metal catalysts play an important role in the field of catalysis.Research on nano-metal catalysts is still an important research topic.With the development of technology,the preparation method of nano metal catalysts has also been greatly developed.Among them,the chemical synthesis method is widely used because of its simple preparation process,relatively mild conditions,uniform particle size of synthesized nano metal particles,and high catalytic activity.A series of nano-metal catalysts have been prepared by chemical synthesis.Most of these catalysts use metal oxides or non-metal compounds as bases to synthesize nano-metal particles on the substrate,and then a series of treatments to form a composite catalyst.Previous studies have found that the high-efficiency catalysis of nano-metal catalysts originates from the electronic properties of nano-metal particles,and the electronic properties of the composite catalyst substrate have a greater impact on the nano-metal particles supported thereon.Therefore,in this thesis,nano-gold resin composites?Au@D201?and nano-copper resin composites?Cu@732?were prepared by using electron-rich resin as the substrate,and their synthesis methods,formation mechanism and various properties were studied.The main content of the paper includes the following three parts:1,Au@D201 preparation and characterization resultsAu@D201 was prepared by static adsorption reduction method using macroporous anion exchange resin D201?D201?as the substrate.The size of the gold nanoparticles in the material was uniform and very small?only 7 nm?by transmission electron microscopy?TEM?and scanning electron microscopy?SEM?.Comparing the pore volume and specific surface area of D201 resin mercury intrusion before and after loading of gold nanoparticles,it was found that the specific surface area of D201resin increased after loading gold nanoparticles,and the pore volume decreased from94.9 cc/g to 17.6 cc/g.Combined with TEM and SEM characterization results,it was found that the gold nanoparticles were uniformly dispersed on the surface of the resin and in the pores?Most of the gold nanoparticles were distributed in the pores?.Comparing the X-ray diffraction?XRD?characterization results of Au@D201 and D201 resin,it was found that the intensity of the characteristic peak of D201 resin decreased with the increase of gold nanoparticle loading after loading gold nanoparticles.A new peak appeared at 30 ^o,and the peak intensity increased as the gold loading increased.We believe this is because the gold nanoparticles supported in the resin act as cross-linking points,changing the order of the resin,thus forming a new peak.X-ray photoelectron spectroscopy?XPS?tests found that gold is present in elemental state,but the characteristic peak of gold has a displacement of 0.57 eV,indicating a strong interaction between the substrate material and the gold nanoparticles.We believe that this interaction is a conjugate interaction between electrons on the benzene ring and gold nanoparticles in the resin backbone.It acts to immobilize gold nanoparticles and enhance the dispersion of gold nanoparticles.It is also this conjugate interaction that makes gold nanoparticles a new crosslinking point for the resin,which changes the order of the resin.2,Catalytic performance study of Au@D201We prepared a series of gold nano-resin polymer composites with gold nanoparticles loading of 0.1%,0.3%,0.5%,0.7%,1%and 2%by adjusting the loading of gold nanoparticles?X%Au@D201?.They were applied to the p-nitrophenol?4-NP?reduction reaction to test their catalytic properties,and the effects of different gold nanoparticle loadings on the catalytic performance of X%Au@D201 were investigated.The results show that the composites with gold nanoparticles loading of 0.1%,0.3%,0.5%,0.7%,1%and 2%have corresponding specific catalytic efficiencies of 4.8 s^-1g^-1 and 8.6 s^-1g^-1,14.8 s^-1g^-1,18.2 s^-1g^-1,27.8s^-1g^-1 and 36.5 s^-1g^-1,respectively.Even X%Au@D201,which has a gold loading of only 0.1%,has excellent catalytic performance.The high-efficiency catalytic mechanism of X%Au@D201 was found to be an important reason for the high-efficiency catalysis of the electronic interaction between the resin substrate and the gold nanoparticles and the small particle size of the gold nanoparticles.3,Preparation of Cu@732 and its catalytic propertiesBased on the research of Au@D201,this paper further selects six different types of resins as experimental materials,compares and analyzes the adsorption capacity of various resins on Cu²⁺and the loading capacity of copper nanoparticles,and screens out the strongest adsorption and load capacity.The cation exchange resin 732?732?was used as a carrier to prepare Cu@732.The effects of different adsorption conditions on the adsorption capacity of 732 resin on Cu²⁺were studied by adjusting the stirring speed,adsorption temperature and pH of the solution.It was found that732 resin had the best adsorption performance for copper ions when the stirring rate was 200 r/min,the adsorption temperature was 30?and the solution pH was 6.The morphology of Cu@732 was characterized by TEM,SEM and XRD.It was found that the copper nanoparticles in Cu@732 have good dispersibility and uniform particle size,and the particle size is about 10 nm.The catalytic performance of Cu@732 was investigated by the reduction reaction of p-nitrophenol,and it was found to have excellent catalytic performance.