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Journal of Nanomaterials
Volume 2009, Article ID 340217, 5 pages
http://dx.doi.org/10.1155/2009/340217
Research Article

Synthesis and Characterization of Magnetic Nanosized F e 3 O 4 / M n O 2 Composite Particles

Department of Power Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China

Received 29 June 2008; Revised 31 August 2008; Accepted 21 October 2008

Academic Editor: Jose A. Pomposo

Copyright © 2009 Zhang Shu and Shulin Wang. 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

Using the prepared F e 3 O 4 particles of 10 nm–25 nm as magnetic core, we synthesized F e 3 O 4 / M n O 2 composite particles with M n O 2 as the shell by homogeneous precipitation. Their structure and morphology were characterized by X-ray diffraction (XRD), X-Ray photoelectron spectroscopy (XPS), transmission electronic microscopy (TEM), Fourier transform infrared spectra (FTIR), and vibration-sample magnetometer (VSM). We show that with urea as precipitant transparent and uniform M n O 2 coating of ca.3 nm thick on F e 3 O 4 , particles can be obtained. The composite particles have better dispersivity than the starting materials, and exhibit super-paramagnetic properties and better chemical adsorption ability with saturated magnetization of 33.5 emu/g. Decoloration experiment of methyl orange solution with F e 3 O 4 / M n O 2 composite suggested that the highest decoloration rate was 94.33% when the pH of methyl orange solution was 1.3 and the contact time was 50 minutes. So this kind of F e 3 O 4 / M n O 2 composite particle not only has super-paramagnetic property, but also good ability of chemical adsorption.