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Synthesis of Magnetically Separable Photocatalyst-TiO_2/SiO_2 coated Mn-Zn Ferrite-and Its Photocatalytic Study

机译：磁分离光催化剂TiO_2 / SiO_2包覆的Mn-Zn铁氧体的合成及其光催化研究

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Magnetically separable photocatalysts are of much interest since they can be used for waste management application and with recyclable advantage. Several TiO_2 incorporated with magnetite have been synthesized but their preparation methods are not convenient. Our aim of this work is to minimize the complication of synthesis procedures and reduce the use of chemicals that were not actually converted to the composite, i.e., surfactant, emulsifier, and stabilizers. With our process, a manganese-zinc ferrite nanoparticle could be prepared by simple co-precipitation of three metal ions, Mn~(2+), Zn~(2+), and Fe~(2+) and the resulting nanoparticles were coated with silica and titania through sol-gel methods. The rate of base addition and reagent mixing were found to be crucial for the size of the forming magnetic particles. Transmission electron microscopy was used to reveal the morphology of magnetic core and silica as well as titania coatings. Vibrating sample magnetometer was used to measure the superpara-magnetism of the composite, performing good saturating magnetization as high as 10-30 emu/g. In addition, the amorphous silica interlayer was found to be advantageous in cancelling the synergistic effect between the two metal oxides. This was observed by monitoring the improved photo-decomposition of methylene blue with UV-Vis spectrophotometer, indicating the possibility in environmental remediation.
机译：磁性可分离的光催化剂备受关注，因为它们可用于废物管理应用并具有可回收利用的优势。已经合成了几种掺有磁铁矿的TiO_2，但制备方法不方便。我们这项工作的目的是最大程度地减少合成程序的复杂性，减少使用实际上没有转化为复合物的化学物质，即表面活性剂，乳化剂和稳定剂。通过我们的方法，可以通过简单地共沉淀三种金属离子Mn〜（2 +），Zn〜（2+）和Fe〜（2+）制备锰锌铁氧体纳米颗粒，并对其进行包覆通过溶胶-凝胶法与二氧化硅和二氧化钛反应。发现碱添加和试剂混合的速率对于所形成的磁性颗粒的尺寸至关重要。透射电子显微镜用于揭示磁芯和二氧化硅以及二氧化钛涂层的形态。振动样品磁强计用于测量复合材料的超顺磁性，表现出高达10-30 emu / g的良好饱和磁化强度。另外，发现无定形二氧化硅中间层在抵消两种金属氧化物之间的协同作用方面是有利的。通过用UV-Vis分光光度计监测亚甲基蓝改善的光分解可以观察到这一点，表明有可能进行环境修复。

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