Fe3O4@SiO2@TiO2@Pt Hierarchical Core鈥揝hell Microspheres: Controlled Synthesis, Enhanced Degradation System, and Rapid Magnetic Separation to Recycle

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• 作者：Xiyan Li ; Dapeng Liu ; Shuyan Song ; Hongjie Zhang
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：November 5, 2014
• 年：2014
• 卷：14
• 期：11
• 页码：5506-5511
• 全文大小：336K
• ISSN：1528-7505

文摘

Magnetic composite microspheres consisting of a SiO₂-coated Fe₃O₄ core, an ordered TiO₂ hierarchically structured shell, and a Pt nanoparticle layer dispersed on the surface of the TiO₂ nanoplatelets have been successfully synthesized using a facile and efficient method. The shells of TiO₂ hierarchical microspheres were assembled from nanoplatelets, which exposed the high-energy {001} facets, and the Pt nanoparticles were evenly deposited on the surface of the TiO₂ nanoplatelets, with a concentration of 鈭? wt %. The resulting composite microspheres exhibited flower-like hierarchical structures with a 202.42 m² g^鈥? surface area and possessed superparamagnetic properties with a high saturation magnetization of 31.5 emu g^鈥?. These features endow the obtained composite microspheres with a high adsorption capacity and strong magnetic responsivity that could be easily separated by an external magnetic field. The high photocatalytic activity toward Rhodamine B (RhB) degradation may be caused by the hierarchically structured TiO₂ with exposed high-energy {001} facets and the Pt nanoparticle deposits on TiO₂ surfaces, which would be efficient for the electron transfer reactions. In addition, the composite microspheres showed high recycling efficiency and stability over several separation cycles.