Room Temperature Synthesis and Photocatalytic Activity of Magnetically Recoverable Fe 3 O 4 /BiOCl Nanocomposite Photoca

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Room Temperature Synthesis and Photocatalytic Activity of Magnetically Recoverable Fe3O4/BiOCl Nanocomposite Photocatalysts Congwei Tan • Gangqiang Zhu • Mirabbos Hojamberdiev • Cai Xu • Jia Liang Pengfeng Luo • Yun Liu



Received: 24 April 2013 Ó Springer Science+Business Media New York 2013

Abstract Magnetically recoverable Fe3O4/BiOCl nanocomposite photocatalysts were fabricated by a simple chemical coprecipitation method at room temperature. The amount of Fe3O4 incorporated into BiOCl was varied from 0 to 20 wt%. The as-synthesized samples were characterized by X-ray diffraction, transmission electron microscopy, energy dispersive spectroscopy, UV–Vis diffuse reflectance spectroscopy, and vibrating sample magnetometer. The obtained results show that the as-synthesized samples mainly contain both crystalline phases (Fe3O4 and BiOCl) and are composed of flower-like nanostructures. Compared to UV lightresponsive BiOCl, all the nanocomposite photocatalysts show a strong light absorbance in the range of 250–800 nm, demonstrating that the Fe3O4/BiOCl nanocomposites can respond to visible as well as UV light. Moreover, visible light absorbance was increased with the increase in the Fe3O4 amount in the composite. The photocatalytic activity of nanocomposite photocatalysts was evaluated by the photodegradation of Rhodamine B (RhB) over the samples under visible light irradiation. The 10 wt% Fe3O4/BiOCl nanocomposite photocatalyst shows the highest photocatalytic efficiency among the samples. The Fe3O4/BiOCl nanocomposite photocatalyst was stable under visible light irradiation to efficiently degrade RhB molecules after five cycles and could be easily recovered with a magnet after each cycle. C. Tan  G. Zhu (&)  C. Xu  J. Liang  P. Luo School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, People’s Republic of China e-mail: [email protected] M. Hojamberdiev Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama, Kanagawa 226-8503, Japan Y. Liu School of Material Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710068, People’s Republic of China

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Keywords Magnetite  Bismuth oxychloride  Rhodamine B  Photocatalytic activity  Visible light irradiation  Magnetic recovery

Introduction A rapid technological development, in turn, has led to the environmental pollution with various chemical compounds. The photocatalysts, regarded as one of the most prospective technologies to degrade the extremely toxic, carcinogenic and stable organic molecules in nature, have attracted increasing research interest. So far, a variety of photocatalysts, in the form of nanopowder, with enhanced adsorption and photocatalytic activity have been developed [1–3]. However, using nanophotocatalysts may generate another issue related to the complete recovery of photocatalyst nanoparticles suspended in the solution. A magnetic separation beneficially provides a convenient way to remove magnetically active species i

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