The Synthesis And Characterization Of Three Dimensinal Nanocomposites And Their Application In Photocatalytic Reaction And Photocatalytic Sterilization

Nanotechnology has been developed rapidly in recent years,nanomaterials had been expanded to application in differet fields like the chemical,physical,medical and so on because of their unique features that include small size,high surface and so on.There are many nanomaterials have been synthesized,especially,the three-dimensional nanomaterials have a lot of special advantages in practical aspects as result of their large specific surface area and rich pore structure.For example,when the three-dimensional nanomater ials were used as adsorbents for environmental pollutants,large adsorption capacity can be achieved immediately,and the effect is very significant;As a nano-sensor,the nanomaterials’ surface would load a large number of specific substances,which could make the signal to be amplified and have a high sensitiv ity and good selectivity;As a photocatalyst,the three-dimensional nanomater ials would be benefic ial to the adsorption of the reaction substrate on the surface of the catalyst.The nanomaterials can also achieve the effective enrichment of light,eliminate the shortcomings of easy agglomeration and reaccumulation effectively,and keep the active sites of the components.Therefore,the stability and photocatalytic activity of the nanomaterials would be improved.We have used some special small organic molecule ligand polymers for docrating the surface of nanomaterials,which would make the nanomaterials has three-dimensional space structure.In this case,the three-dimensional nanomaterials can further optimize their excellent properties and make them has excellent effect in the fields of photocatalytic effect,photocatalytic sterilization,detection and so on.Thence,based on the previous research of previous results,this thesis have researched the construction of three-dimensional nanomaterials and their application in the field of photocatalytic,photocatalytic sterilization and reduction of p-nitrophenol are carried out in the following three aspects: i.Modif ing Fe₃O₄@Cu_2-xS NPs and magnetic nanoparticles Fe₃O₄ NPs with the coordination polymer（DIB-TETA）to constitute two kinds of three-dimensional soluble inorganic nanoparticles porous complex framework(Fe₃O₄@Cu_2-xS-FS and Fe₃O₄-FS),then the Fe₃O₄@Cu_2-xS-FS is used as a photocatalyst for Suzuki reaction;ii.One-step photoinduced synthesis of the three-dimensional porous walnut Au/complex framework nanomaterials,and as a photocatalyst to photocatalytic bactericidal;iii.One-step photoinduced synthesis synthesis of Pd/complex framework nanomaterial,and as a p-nitrophenol reduction catalyst.The thesis is divided into four chapters,stated as follows:Chapter I: Firstly,the overview of nanomaterials was described,including the development and classification of nanomaterials,Next,several classical synthetic methods of nanomaterials were introduced,including precipitation method,hydrothermal solvothermal method,thermal decomposition method of precursor,vacuum condensation method,ion sputtering method and high energy ball grinding method.Then,we have introduced the application of nanomaterials in the field of photocatalysis,photocatalytic bactericidal and so on.Finally,the development and application of a special polymer nanocomposites was introduced.Chapter II: In this paper,two kinds of three-dimensional soluble inorganic nanoparticle porous complex framework(Fe₃O₄@Cu_2-xS-FS and Fe₃O₄-FS)were prepared by using Fe₃O₄@Cu_2-xS NPs（Fe₃O₄ NPs）as the node and decorating coordination polymer（DIB-TETA）,and due to the good solubility of Fe₃O₄@Cu_2-xS-FS nanomaterials and its absorption characteristics in the near-infrared region,the Fe₃O₄@Cu_2-xS-FS could be used to catalyes for the reaction of the Suzuki coupling in the near-infrared region,and the catalytic effect is good.We can get up to 92% yield,the material also could be recovered and recycled several times.Chapter III: In this paper,the three-dimensional porous walnut Au/complex framework nanomaterials was synthesized by adding gold-containing material（HAuCl4·4H2O）to the porous three-dimensional soluble inorganic nanoparticles.This nanomaterial structure has good absorption in vis ible and near-infrared regions,and could act as a photocatalytic to kill bacteria.Under the condition of light,the catalyst has a excellent bactericidal property,it could kill E.coli within 60 minutes,but in the dark condition,the number of E.coli has no change.At the same time,the material has a certain magnetic property,which could be recycled under the action of external magnetic field.Chapter IV: In this paper,the second work has been expanded.A three-dimensional porous Pd/complex framework nanomaterial was synthesized by using the solution containing palladium nitrate to enter into the porous structure of the three-dimensional soluble inorganic nanoparticles in the condition of light,then the palladium was doped into the Pd/complex framework material.This nanomaterial could be used as a catalyst for the reduction of p-nitrophenol with a ideal catalytic effect,and the reaction time takes only 20 minutes from the UV absorption diagram.This nanomaterial also has a certain magnetic property and can be recovered under the action of external magnetic field.