【摘 要】
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The synthesis of SiO2 coated magnetic particle has been the focus for adsorption of heavy metal ions and separation due to the outstanding ability to separa
【机 构】
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Dept.of Chemical & Biomolecular Eng.,KAIST,Daejeon,Republic of Korea,305-701
【出 处】
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The 6th International Conference on Separation and Technolog
论文部分内容阅读
The synthesis of SiO2 coated magnetic particle has been the focus for adsorption of heavy metal ions and separation due to the outstanding ability to separate adsorbent materials via external magnetic field.Magnetic adsorbents were prepared with fabricating colloidal crystals by using monodisperse SiO2 coated magnetic nanoparticle (SiO2/MFe2O4,M=Fe2+,Mn2+,Co2+) microsphere with a core-sbell structure to remove heavy metal ions from aqueous media.Magnetic adsorbents were synthesized in the basic condition with magnetic nanoparticles,second surfactant,tetraethyl orthosilicate (TEOS) and ammonium hydroxide via 2 main steps by a modified Stober process and the layer-by-layer (LbL) assembly technique due to hydrophobic surface property of magnetic nanoparticles.The hydroxide surface properties of magnetic adsorbents were functionalized to amine,caroxylate,thiol group by the surface modification process.The functionalized adsorbents were synthesized for use in the removal of heavy metal ions from aqueous solutions.The magnetic adsorbents were separated with external magnetic field.
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