TECHNICAL NOTES
May 30, 2009

Photocatalytic Degradation of Orange II in Aqueous Iron-Rich Montmorillonite Solutions

Publication: Journal of Environmental Engineering
Volume 136, Issue 1

Abstract

In this work the photodegradation of orange II was carried out in the presence of iron-rich montmorillonite (MMt) (2.24% Fe2O3 ) using a 15-W low-pressure ultraviolet lamp (λ=254nm,I=48.4μW/cm2) . The effects of pH, MMt dose, and dye concentration were studied. A low pH value is favorable for the decolorization of orange II. The hydroxyl radical (OH) concentration increased with increasing concentration of MMt in aqueous solutions in the range of 0–1.5 g/L. Concentrations higher than 5.0 g/L MMt inhibited the OH production. There was no significant decrease in photocatalytic activity when the catalyst was reused. Hydroxyl radicals were detected by tert-butyl alcohol in aqueous MMt suspensions under ultraviolet irradiation and were responsible for the degradation of orange II. Free iron ions dissolved in MMt suspensions, structural iron in the MMt structural and the charged surface of nanoclay are responsible for the hydroxyl radical (OH) production. Free iron ions dissolved in solution plays a predominant role in the degradation of orange II. This study shows that iron-rich MMt is a potential photocatalyst for dye wastewater treatment.

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Information & Authors

Information

Published In

Go to Journal of Environmental Engineering
Journal of Environmental Engineering
Volume 136Issue 1January 2010
Pages: 152 - 158

History

Received: Oct 8, 2008
Accepted: May 26, 2009
Published online: May 30, 2009
Published in print: Jan 2010

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Authors

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Zong-ping Wang [email protected]
Associate Professor, School of Environmental Science and Engineering, Huazhong Univ. of Science and Technology, Wuhan 430074, People’s Republic of China (corresponding author). E-mail: [email protected]
Li-zhi Huang [email protected]
Master, School of Environmental Science and Engineering, Huazhong Univ. of Science and Technology, Wuhan 430074, People’s Republic of China. E-mail: [email protected]
Master, School of Environmental Science and Engineering, Huazhong Univ. of Science and Technology, Wuhan 430074, People’s Republic of China. E-mail: [email protected]
Master, School of Environmental Science and Engineering, Huazhong Univ. of Science and Technology, Wuhan, 430074, People’s Republic of China. E-mail: [email protected]
Master, School of Environmental Science and Engineering, Huazhong Univ. of Science and Technology, Wuhan 430074, People’s Republic of China. E-mail: [email protected]

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