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International Journal of Photoenergy
Volume 2012 (2012), Article ID 365401, 8 pages
http://dx.doi.org/10.1155/2012/365401
Research Article

Synthesis of Fe3O4/C/TiO2 Magnetic Photocatalyst via Vapor Phase Hydrolysis

1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China
2Engineering Research Center of Advanced Glasses Manufacturing Technology, MOE, Donghua University, Shanghai 201620, China

Received 14 September 2011; Revised 15 November 2011; Accepted 15 November 2011

Academic Editor: Jiaguo Yu

Copyright © 2012 Fuzhi Shi 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

A core/multi-shell-structured Fe3O4/C/TiO2 magnetic photocatalyst is prepared via vapor phase hydrolysis process. The as-synthesized core/multi-shell-structured composite is characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high-resolution electron microscopy (HRTEM), N2 adsorption-desorption isotherm analyses, vibrating sample magnetometer (VSM), and ultraviolet-visible (UV-Vis) absorption spectroscopy. TEM and HRTEM show that well-crystallized anatase TiO2 nanocrystals are immobilized on the surface of as-prepared Fe3O4/C microspheres with dimensions around 200 nm. N2 adsorption-desorption isotherm analysis shows that the obtained photocatalyst exists disorderedly mesoporous structure. The photocatalytic efficiency of the catalyst in degradation of methylene blue is evaluated, and the Fe3O4/C/TiO2 photocatalyst with low TiO2 content (37%) has a relatively higher activity than commercial anatase TiO2. The intermediate carbon layer avoids the photodissolution of Fe3O4 effectively, and the recycling property is largely improved due to the existence of magnetic Fe3O4 core.