In Situ Preparation Of Polymer Supported Metal Nanoparticles For Tunable Catalysis

The surface nanoparticles of the metal nanoparticle material are particularly specific and have a high specific surface area,and exhibit excellent performance.Therefore,metal nanoparticles are a good catalyst.Metal nanoparticle catalysts can be divided into noble metal catalysts(Au,Pd,Ag,Rh,Pt)and nonmetallic catalysts(Co,Fe,Ni).Since the metal nanoparticles are easily agglomerated during the synthesis process,they can be effectively avoided when the metal nanoparticles are supported in situ on the surface or skeleton of inorganic materials,nanotubes,copolymers,polymer hydrogels,polymer brushes,etc.Agglomeration,lower surface than the defects,and thus select the appropriate carrier to become the key to the preparation of efficient catalyst.In this paper,based on the magnetic nanomaterials,the metal nanopowders were prepared by polymer-assisted in-situ preparation of the polymer,and the reduction of p-nitrophenol was used as the model reaction.The recyclable catalysis of the prepared materials was studied.performance.And the use of polymer to stimulate the response,to achieve the catalytic activity of nanoparticles regulation.The specific research content is divided into the following two parts:(MHNTs-PDA-Au),which is simple and environmentally friendly and does not need to use any toxic substances.The PDA layer is used as a reducing agent and as a reducing agent.Firstly,the preparation of poly(dopamine)functionalized magnetic spironite nanotubes loaded with Au nanoparticles(MHNTs-PDA-Au)As a stabilizer.The prepared MHNTs PDA-Au catalyst exhibits excellent catalytic activity for the reduction of nitrobenzene derivatives and methylene blue dyes,greatly reducing the amount of precious metal catalyst used.The hybrid material has a good magnetic,easy recycling,recycling eight times,still able to maintain a high activity and stability.At the same time,the method has a certain universality,the same applies to Ag and non-precious metal Cu-supported catalyst preparation.The research on the one hand extends the application of natural lorite nanotubes in controllable adsorption,catalyst carrier and so on.On the other hand,it provides a new method for the green and simple preparation of high efficiency polymer supported catalyst.Secondly,the intelligent nano-reactor with spherical polyelectrolyte-supported Au nanoparticles was designed and fabricated.The Fe3O4 functionalized Fe3O4 was prepared by surface-initiated atom transfer radical polymerization(SI-ATRP)using Fe3O4 nanoparticles as spherical substrate and modified with a layer of poly dopamine(PDA)as the initiator connection layer on the surface.The HAu Cl4 solution was adsorbed on the surface of the polyelectrolyte and then reduced to Au nanoparticles by Na BH4 to obtain a nano-reactor with magnetic polyelectrolyte-supported Au nanoparticles.As the polyelectrolyte brushes have ion-pair responsiveness,the in-situ exchange of ions in the polyelectrolyte brushes,the condensation of polyelectrolyte chains and the aggregation of Fe3O4 nanospheres are carried out to achieve a significant regulation of the catalytic activity of gold nanoparticles.The method provides a new idea for the design and preparation of intelligent adjustable catalyst.