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Journal of Nanomaterials
Volume 2014, Article ID 986809, 7 pages
http://dx.doi.org/10.1155/2014/986809
Research Article

Photocatalytic Property of Fe3O4/SiO2/TiO2 Core-Shell Nanoparticle with Different Functional Layer Thicknesses

1Key Laboratory of Instrumentation Science and Dynamic Measurement of Ministry of Education, North University of China, Taiyuan, Shanxi 030051, China
2Science and Technology on Electronic Test & Meaurement Laboratory, North University of China, Taiyuan, Shanxi 030051, China
3College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030051, China
4Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong

Received 19 November 2013; Revised 20 January 2014; Accepted 20 January 2014; Published 24 February 2014

Academic Editor: Christian Falconi

Copyright © 2014 Junyang Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study examined the different properties of Fe3O4/SiO2/TiO2 (FST) core-shell nanoparticles encapsulated for one to five different times, represented as FST1 to FST5, respectively. These FST nanoparticles were obtained using the carbon reduction and sol-gel methods, and their properties were characterized by various tools, such as scanning electron microscopy, transmission electron microscopy, X-ray diffraction, vibratory sample magnetometer, laser granularity apparatus, and specific surface area analyzer. The relationship between irradiation time and decoloration ratio indicates that FST2 demonstrated significant efficiency in the decolorization of methyl orange (MO) under UV light. Further study on recycle activity showed that FST2 had a high decoloration rate after four cycles of photocatalysis, and its degradation of MO was well aligned with the apparent first-order kinetic equation. Furthermore, FST2 exhibited the highest apparent rate in the first cycle. All these results demonstrate that the recoverable FST2 possessed excellent photocatalytic activity while maintaining outstanding stability for further applications, such as managing environmental pollution.