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International Journal of Photoenergy
Volume 2013 (2013), Article ID 350698, 7 pages
http://dx.doi.org/10.1155/2013/350698
Research Article

Dyes Degradation with Fe-Doped Titanium Nanotube Photocatalysts Prepared from Spend Steel Slag

1Department of Cosmetic Application and Management, St. Mary’s Medicine Nursing and Management College, Number 100, Lane 265, Section 2, Sansing Road. Sansing Township, Yilan County 266, Taiwan
2Department of Environmental Engineering, National I-Lan University, Number 1, Section 1, Shen-Lung Road, Ilan 260, Taiwan

Received 22 January 2013; Revised 20 April 2013; Accepted 23 April 2013

Academic Editor: Jiaguo Yu

Copyright © 2013 Chih Ming Ma 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

TiO2 has been studied most commonly because it has high stability, nontoxicity, high catalytic activity, and high conductivity. Many studies have shown that TiO2 would generate electron-hole pairs illuminated with UV and surround more energy than that before being illuminated. In this study, the titanium nanotube (TNT) photocatalysts were prepared to increase the surface area and adsorption capacity. The Fe TNT was also prepared from a slag iron since many slag irons cause waste treatment problems. In this study, a different Fe loading was also assessed since TNT doped with metals can be used to improve the degradation efficiency. Furthermore, five kinds of dye concentration, including 10, 20, 100, 200, and 400 ppm, and five kinds of Fe-doped content, including 0, 0.77, 1.13, 2.24, and 4.50%, were tested. Different kinds of reaction time and dye species were also assessed. In this result, Direct Black 22 was the most difficult to be degraded, although the concentration was decreased or the dose amount was increased. The degradation efficiency of 10 ppm Direct Black 22 was below 40% with 0.04 gL−1 TNT under 365 nm UV irradiation.