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Synthesis Characterization and Photocatalytic Studies of Cobalt Ferrite-Silica-Titania Nanocomposites

机译:钴铁氧体-二氧化硅-二氧化钛纳米复合材料的合成表征及光催化研究

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In this work, CoFe2O4@SiO2@TiO2 core-shell magnetic nanostructures have been prepared by coating of cobalt ferrite nanoparticles with the double SiO2/TiO2 layer using metallorganic precursors. The Transmission Electron Microscopy (TEM), Energy Dispersive X-Ray Analysis (EDX), Vibrational Sample Magnetometer (VSM) measurements and Raman spectroscopy results confirm the presence both of the silica and very thin TiO2 layers. The core-shell nanoparticles have been sintered at 600 °C and used as a catalyst in photo-oxidation reactions of methylene blue under UV light. Despite the additional non-magnetic coatings result in a lower value of the magnetic moment, the particles can still easily be retrieved from reaction mixtures by magnetic separation. This retention of magnetism was of particular importance allowing magnetic recovery and re-use of the catalyst.
机译:在这项工作中,CoFe 2 O 4 @SiO 2 @TiO 2 核-壳磁性纳米结构的制备通过使用金属有机前驱体在硅铁钴纳米颗粒上涂覆双SiO 2 / TiO 2 层。透射电子显微镜(TEM),能量色散X射线分析(EDX),振动样品磁强计(VSM)测量和拉曼光谱结果证实了二氧化硅和非常薄的TiO 2 层的存在。核-壳纳米粒子已在600°C下烧结,并在紫外光下用作亚甲基蓝的光氧化反应的催化剂。尽管附加的非磁性涂层导致较低的磁矩值,但仍可以通过磁分离从反应混合物中轻松回收颗粒。磁性的保持特别重要,以允许磁性回收和催化剂的再利用。

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