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Journal of Nanomaterials
Volume 2012, Article ID 413542, 6 pages
Research Article

Degradation of Semiconductor Manufacturing Wastewater by Using a Novel Magnetic Composite TiO2/Fe3O4 Photoreactor Design

1Center of General Education, National Taitung College, 889 Jhengci N. Rdoa, Taitung City 95045, Taiwan
2Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kung Road, Taichung City 402, Taiwan

Received 13 February 2012; Revised 25 April 2012; Accepted 26 April 2012

Academic Editor: Jiaguo Yu

Copyright © 2012 Chen-Yu Chang and Yung-Hsu Hsieh. 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.


The purpose of this research is to develop a photocatalytic TiO2 that can be activated by visible light and can be conveniently recollected for reusing. This research synthesizes the 20 to 40 nm TiO2/Fe3O4 particles with magnetization of 5.8 emu/g using the modified sol-gel method followed by 500°C calcinations. The experiment verified that visible fluorescent light (VFL, contains no UV-A) could activate the photocatalytic activity of TiO2/Fe3O4 particles as did ultraviolet A light (UV-A, 360 nm). Regular magnets can be used to separate TiO2/Fe3O4 particles from solution. The results indicate that VFL-sirradiated TiO2/Fe3O4 particles could decompose isopropanol (IPA) in the absence of UV-A and the issue of TiO2/Fe3O4 recollection from water for reusing is also resolved.