Degradation mechanisms and kinetic studies for the treatment of X-ray contrast media compounds by advanced oxidation/reduction processes

Title
Degradation mechanisms and kinetic studies for the treatment of X-ray contrast media compounds by advanced oxidation/reduction processes
Author(s)
정진영정준선[정준선]윌리엄 쿠퍼[윌리엄 쿠퍼]웨이후와 송[웨이후와 송]
Keywords
ADVANCED OXIDATION PROCESSES; FREE-RADICAL DESTRUCTION; MUNICIPAL WASTE-WATER; AQUEOUS-SOLUTION; AQUATIC ENVIRONMENT; HUMAN PHARMACEUTICALS; PULSE-RADIOLYSIS; OZONATION; IOMEPROL; FATE
Issue Date
201008
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
WATER RESEARCH, v.44, no.15, pp.4391 - 4398
Abstract
The presence of iodinated X-ray contrast media compounds (ICM) in surface and ground waters has been reported. This is likely due to their biological inertness and incomplete removal in wastewater treatment processes. The present study reports partial degradation mechanisms based on elucidating the structures of major reaction by-products using gamma-irradiation and LC-MS. Studies conducted at concentrations higher than observed in natural waters is necessary to elucidate the reaction by-product structures and to develop destruction mechanisms. To support these mechanistic studies, the bimolecular rate constants for the reaction of (center dot)OH and e(aq)(-) with one ionic ICM (diatrizoate), four non-ionic ICM (iohexol, iopromide, iopamidol, and iomeprol), and the several analogues of diatrizoate were determined. The absolute bimolecular reaction rate constants for diatrizoate, iohexol, iopromide, iopamidol, and iomeprol with (center dot)OH were (9.58 +/- 0.23)x10(8), (3.20 +/- 0.13)x10(9), (3.34 +/- 0.14)x10(9), (3.42 +/- 0.28)x10(9), and (2.03 +/- 0.13)x10(9) M(-1) s(-1), and with e(aq)(-) were (2.13 +/- 0.03)x10(10), (3.35 +/- 0.03)x10(10), (3.25 +/- 0.05)x10(10), (3.37 +/- 0.05)x10(10), and (3.47 +/- 0.02) x 10(10) M(-1) s(-1), respectively. Transient spectra for the intermediates formed by the reaction of (center dot)OH were also measured over the time period of 1-100 mu s to better understand the stability of the radicals and for evaluation of reaction rate constants. Degradation efficiencies for the (center dot)OH and e(aq)(-) reactions with the five ICM were determined using steady-state gamma-radiolysis. Collectively, these data will form the basis of kinetic models for application of advanced oxidation/reduction processes for treating water containing these compounds. (C) 2010 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/23835http://dx.doi.org/10.1016/j.watres.2010.05.054
ISSN
0043-1354
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공과대학 > 환경공학과 > Articles
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