Fenton and Photo-Fenton Oxidation of Petroleum Aromatic Hydrocarbons Using Nanoscale Zero-Valent Iron
Publication: Journal of Environmental Engineering
Volume 139, Issue 7
Abstract
This study investigated the feasibility of nanoscale zero-valent iron(nZVI) as the source of catalytic ferrous iron for Fenton and photo-Fenton oxidation of petroleum aromatic hydrocarbons. The oxidation processes were able to degrade more than 99% of benzene, toluene, ethylbenzene, and xylene (BTEX) within 15 min at pH 3.0, which the initial concentrations of BTEX, nZVI, and were , 9 mM, and , respectively. The average pseudo-first-order constants for BTEX degradation were 0.309 and at pH 3.0 for Fenton and photo-Fenton processes, respectively. Experiments revealed that by increasing pH, solubility of nZVI decreased significantly, while ultraviolet (UV) irradiation improved nZVI solubility and subsequently BTEX degradation. Cations and anions were found to reduce oxidation efficiencies of BTEX; among anions, and had the most negative effect on the removal efficiencies. On the other hand, and played a considerable inhibitor role among cations. The removal efficiencies of both systems declined when treating real polluted groundwater collected from the city of Tehran, Iran.
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Acknowledgments
The authors acknowledge the laboratory of faculty of environment at the University of Tehran for BTEX analysis.
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 139 • Issue 7 • July 2013
Pages: 966 - 974
Copyright
© 2013 American Society of Civil Engineers.
History
Received: May 18, 2012
Accepted: Feb 15, 2013
Published online: Feb 18, 2013
Published in print: Jul 1, 2013
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