Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27362
Title: Degradation of iopromide by combined UV irradiation and peroxydisulfate
Authors: Chan, TW
Graham, NJD
Chu, W 
Issue Date: 2010
Source: Journal of hazardous materials, 2010, v. 181, no. 1-3, p. 508-513
Abstract: The aqueous degradation of iopromide, an iodinated X-ray contrast media (ICM) compound, by the combination of UV254 irradiation and potassium peroxydisulfate (K2S2O8) has been studied in laboratory scale experiments. The influence of various parameters on the performance of the treatment process has been considered, namely the UV irradiation light intensity, the initial concentrations of iopromide and peroxydisulfate, and the initial solution pH. Iopromide degradation increased with UV light intensity and peroxydisulfate concentration, but decreased with initial pH. Under specific conditions complete removal of iopromide was achieved within 30min, and near-complete mineralisation (loss of solution TOC) within 80min. Degradation was believed to be caused by a combination of direct photolysis, sulphate radical attack, and, to a minor degree, direct oxidation by peroxydisulfate. Approximate values for the reaction rate constants have been determined and found to be equal to 1-2×104M-1s-1 for sulfate radicals, and 1-2M-2s-1 for S2O82-. Overall compound degradation was observed to follow first-order kinetics where the rate constant decreased with initial solution pH. During the reaction, the solution pH decreased as a consequence of sulfate radical scavenging.
Keywords: AOPs
Iodinated X-ray contrast media
Iopromide
Peroxydisulfate
UV irradiation
Publisher: Elsevier
Journal: Journal of hazardous materials 
ISSN: 0304-3894
EISSN: 1873-3336
DOI: 10.1016/j.jhazmat.2010.05.043
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