Visible Light Catalytic Degradation of Methyl Orange in Aqueous Solution by (, Br, I)
Publication: Journal of Environmental Engineering
Volume 138, Issue 3
Abstract
Bi-based oxyhalide (, Br, I) photocatalysts have been prepared by the combined method of liquid phase and solid state reactions and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). Using the azo dye wastewater simulated by aqueous methyl orange (MO) solutions, photocatalytic activity of these catalysts was studied under ultraviolet light, visual light, and solar irradiation. All of the samples had high photocatalytic activity. After 2 h of ultraviolet radiation, the degradation efficiency of methyl orange by (, Br, I) was as high as 100%. Under visible-light and solar irradiation, the photocatalytic activity decreased in the order . More than 90% degradation efficiency was observed for after 12 h of solar irradiation. Furthermore, the photocatalytic degradation kinetics of methyl orange have been investigated under different types of light irradiation.
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Acknowledgments
The authors thank the Science and Technology Commission of Henan Province (UNSPECIFIEDNo. 102102210061) and Henan Key Laboratory for Environmental Pollution Control for their financial support.
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 138 • Issue 3 • March 2012
Pages: 259 - 264
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Oct 26, 2010
Accepted: Apr 26, 2011
Published online: Feb 15, 2012
Published in print: Mar 1, 2012
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