Decoration Of Layered Silicate Magadiite And The Research Of Related Properties

Synthesis of materials is the basement of properties research.By the increasingly in-depth research on the synthesis and preparation of nanomaterials,there is a deep insight in the special properties.Due to the special structure of layered compound,it could be used for preparation of host-gueat material and be applied in hot research areas,such as energy storage and conversion,chemical catalysis,electronic devices and other fields.When host material is combined with guest molecules,the properties of the inorganic layered materials could be controlled in a certain extent.Magadiite is a typical inorganic layered silicate as a basement for intercalation,which owns merits such as ordered layered structure,easy to be synthesized,no aluminium in the structure and good stability.However,compared to the widely studied of other inorganic cation layered silicate in host-guest chemistry,magadiite has not been well studied.Hence,we fabricate the negatively charged layered silicate-magadiite to study the properties of the compouds.The target is aiming at providing the experimental basis to the host-guest assembly chemistry area of magadiite by additional new peoperties of guest molecules,along with providing theoretical foundation to the expanding application of magadiite.We choose different structure types of intercalant and various of intercalation method to modify magadiite,which synthesized different proportions and tructures compounds.The optical and magnetic properties of the intercalated compound is studied.Characterizations such as X-ray powder diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),thermogravimetry-differential thermal analysis(TGA-DTA),scanning electron microscope(SEM)and transmission electron microscope(TEM)are used to test the structure and micro morphology of the host-guest materials based on layered silicate.By discussing the porperties change after the intercalation of guest molecule,the method of intercalation and the corresponding formation mechanism,the main study results are as follows:(1)8-Hydroxyquinoline-metal intercalated magadiite compound is synthesized by a solid intercalation reaction,which is based on the chelating reaction between the metal ions and 8-hydroxyquinoline and magadiite as a host material.After 8-hydroxyquinoline-metal complex is intercalated,the magadiite shows a unique photoluminescence different from the powder state,which is induced by the confined space of magadiite.(2)Vanadium oxide is introduced into the interlayer of raw material magadiite and solidified on the surface of platelets by ion-exchange and calcination method.By characterization,the exchanged V02+ ions can be converted into(Si-O)3V=O,and it exhibits a incomplete oxidized mix valence state(+4/+5).The characterization results of vanadium oxide decorated magadiite reveal the optical property and paramagnetism.(3)A metal oxide(CuO/ZnO)and CTAB intercalated magadiite composite was synthesized by pre-intercalating CTAB and second-time ion-exchange and precipitation method.By characterizations of photoluminescence and magnetism of interlayer metal oxide,it si found that the dispersed ZnO show a blue fluorescence at 420,484 and 532 nm.The lowest loaded and best dispersed sample shows the strongest intensity photoluminescence.The interlayer dispersed nanosized CuO shows paramagnetism.These results indicate that the intercalated metal oxide shows a different photoluminescence and magnetism property from the bulk state of metal oxide.Meanwhile,the results indicate that it is possible to prepare highly-dispersed metal oxide inside the magadiite.(4)POP2000/POP4000-Fe3O4-mag compounds are synthesized by introducing polyether amine(POP2000/POP4000)into magadiite using ion-exchange reaction,along with second-time ion-exchange and coprecipitation of Fe3O4.In the experiment,influences of experimental conditions such as polymer chain length,pH,quantity of metal ions/oxides on the final product structure and absorption process is considered.When pH?2,a crowding out effect occurred when Fe2+ and Fe3+ is exchanged and coprecipitated.The crowding out effect make an influence on polymer with short chain length such as POP2000 more than long chain length such as POP4000.By ion-exchanging POP2000/POP4000,it can be concluded that the polymer can efficiently expand the basal spacing.Besides,it can be coexisted with Fe3O4.In absorption experiment,the final product POP4000-mag-Fe3O4 owns a relative high absorptive capacity(5 g/g).The experiment proves that host-guest material have an excellent capacity for absorbing and recycling crude oil.