Synthesis Of Magnetic Inorganic Layered Nanocomposites And Their Catalytic And Adsorption Properties Study

Inorganic layered nanocomposites are a new class of nano-functional materials with special structure and properties.They are also the front and hot research fields of chemistry and materials recently with extensive potential applications.On the base of two layered materials（silicate and hydrotalcite）,the purpose of this thesis is to explore simple chemical principles and preparation methods to synthesize magnetic layered inorganic micro/nano materials with core-shell structure or hollow feature,and study their potential applications in dye catalysis and protein adsorption.Firstly,the utilization of hierarchical nickel silicate with mussel chemistry for constructing metallic Ni nanoparticles（Ni NPs）inside silica framework offers great advantages for rational design of advanced catalysts and protein adsorbents.Herein,we demonstrate that by coating a thin layer of polydopamine（PDA）on the surface of Fe₂O₃@Nickel Silicate（Fe₂O₃@NS）,followed by thermal treatment in nitrogen atmosphere,high density of metallic Ni NPs immobilized magnetic yolk-like nano-spindles has been synthesized.Notably,the density and diameters of Ni NPs as well as the component of Fe₂O₃cores were also effectively tailored by changing the carbonization temperature.Moreover,this strategy can be extended to other cores with different morphology and component.Owing to the unique structure and high density of Ni NPs for FeO_x@Si O₂@C-Ni,the resultant product exhibited excellent performance of MnO@Al₂O₃@C/Ni ultra-long nanosheets by constructing polydopamine-Nickel(PDA-Ni²⁺)complex thin coatings on NiAl-LDH nanosheets,which can be carbonized in nitrogen environment,with well-dispersed metallic nickel embedded in PDA-derived thin carbon layers.The converted MnO@Al₂O₃@C/Ni core-shell nanostructures not only exhibited effective catalytic performance,but highly selective adsorption on His-rich proteins.And the above nanomaterials possess magnetism,which can be easily separate from solution with an extra magnetic field.Additionally,the thin laminar NiAl-LDH can grow on different templates to form 3-D hierarchical nanostructures via a Chemical Bath Deposition that can improve the function of hybrid and enhance their potential for practical applications.Lastly,high performance C@NiCo nanocages with different non-metal doped,including N,P and S have been successfully synthesis.Herein we report a facile three-step.These uniform ZIF-67 building blocks are firstly converted into NiCo-LDH cage-like hollow composites under ultrasonic condition at room temperature to form the complex hollow dodecahedrons through a PZS-coating process with annealing treatment.When evaluated as an catalytic material for p-nitrophenol or adsorbent for His-rich protein,the as-prepared C@NiCo hollow prisms show remarkable performance with good recycling.