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 Silica and Mesoporous Silica Coated Metal Oxides Nanopartiles: Synthesis, Characterization and Application

Show simple item record Sara Taha Shaker Albhaisi 21/10/2020 21/10/2020 2020-10-21T10:02:44Z 21/10/2020 2020-10-21T10:02:44Z 8/18/2015
dc.description.abstract AbstractPure metal oxides nanoparticles such as magnesium oxide and zinc oxide (MgO and ZnO) were successively synthesized using a co-precipitation method (oxalate route). Silica and meso silica coating of metal oxides microsphers of general formula MO@SiO2, MO@mSiO2 or MO@SiO2@mSiO2 were prepared using simple sol gel method (St?ber method). In this method the metal oxide nanparticles were firstly dispersed into the solution prior to silica encapsulation by sol-gel method. Amine or thiol functionalized of pure metal oxide, meso silica or silica-mesosilica coated metal oxide are also prepared by grafting method, using the appropriate silane coupling agents. Meso silica or silica-meso silica free of metal oxide were obtained by treatment of silica coated metal oxides with dilution HCl. It is found that these metal oxide nanoparticles were fully dispersed into silica microsphers and their outer meso silica shells were functionalized by amine or thiol functional ligand groups. It is found that, the coating with silica or mesosilica shells does not altered the particle size of the encapsulated metal oxide nanoparticles. It is found that these nanoparticles are well dispersed in one or both silica shells. The silica and meso silica coating of magnesium oxide and its amine functionalized were used for the adsorption and removal of BTB and heavy toxic metals from water, UV-VIS studies indicate that some of these materials showed high potential for the removal of toxic dyes and heavy metal ions. The synthesized MgO and ZnO and their silica meso silica coating samples were characterized by thermal gravimetric analysis (TGA), Powder X-ray diffraction (XRD), Transmission electron microscopy (TEM), Energy dispersive X-ray spectroscopy (EDX), UV-VIS and Photoluminescence spectroscopy. FTIR and TGA and 13C NMR analysis have proved that the organofunctional groups were introduced into the meso silica outer shell. XRD results confirmed that there was no significant change in particle size after silica coating process. TEM analysis showed that the metal oxide particles are well dispersed into silica microspheres and into the meso outer shell. Three shells around metal oxide core are well observed, silica , meso silica and functionalized silica. en_US
dc.language.iso en_US en_US
dc.title  Silica and Mesoporous Silica Coated Metal Oxides Nanopartiles: Synthesis, Characterization and Application en_US
dc.type Thesis en_US

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