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Degradation of iopromide by combined UV irradiation and peroxydisulfate
The aqueous degradation of iopromide, an iodinated X-ray contrast media (ICM) compound, by the combination of UV(254) irradiation and potassium peroxydisulfate (K(2)S(2)O(8)) has been studied in laboratory scale experiments. The influence of various parameters on the performance of the treatment pro...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier B.V.
2010
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7116998/ https://www.ncbi.nlm.nih.gov/pubmed/20561746 http://dx.doi.org/10.1016/j.jhazmat.2010.05.043 |
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author | Chan, Ting W. Graham, Nigel J.D. Chu, Wei |
author_facet | Chan, Ting W. Graham, Nigel J.D. Chu, Wei |
author_sort | Chan, Ting W. |
collection | PubMed |
description | The aqueous degradation of iopromide, an iodinated X-ray contrast media (ICM) compound, by the combination of UV(254) irradiation and potassium peroxydisulfate (K(2)S(2)O(8)) 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 30 min, and near-complete mineralisation (loss of solution TOC) within 80 min. 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 × 10(4) M(−1) s(−1) for sulfate radicals, and 1–2 M(−2) s(−1) for S(2)O(8)(2−). 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. |
format | Online Article Text |
id | pubmed-7116998 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2010 |
publisher | Elsevier B.V. |
record_format | MEDLINE/PubMed |
spelling | pubmed-71169982020-04-02 Degradation of iopromide by combined UV irradiation and peroxydisulfate Chan, Ting W. Graham, Nigel J.D. Chu, Wei J Hazard Mater Article The aqueous degradation of iopromide, an iodinated X-ray contrast media (ICM) compound, by the combination of UV(254) irradiation and potassium peroxydisulfate (K(2)S(2)O(8)) 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 30 min, and near-complete mineralisation (loss of solution TOC) within 80 min. 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 × 10(4) M(−1) s(−1) for sulfate radicals, and 1–2 M(−2) s(−1) for S(2)O(8)(2−). 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. Elsevier B.V. 2010-09-15 2010-05-16 /pmc/articles/PMC7116998/ /pubmed/20561746 http://dx.doi.org/10.1016/j.jhazmat.2010.05.043 Text en Copyright © 2010 Elsevier B.V. All rights reserved. Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active. |
spellingShingle | Article Chan, Ting W. Graham, Nigel J.D. Chu, Wei Degradation of iopromide by combined UV irradiation and peroxydisulfate |
title | Degradation of iopromide by combined UV irradiation and peroxydisulfate |
title_full | Degradation of iopromide by combined UV irradiation and peroxydisulfate |
title_fullStr | Degradation of iopromide by combined UV irradiation and peroxydisulfate |
title_full_unstemmed | Degradation of iopromide by combined UV irradiation and peroxydisulfate |
title_short | Degradation of iopromide by combined UV irradiation and peroxydisulfate |
title_sort | degradation of iopromide by combined uv irradiation and peroxydisulfate |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7116998/ https://www.ncbi.nlm.nih.gov/pubmed/20561746 http://dx.doi.org/10.1016/j.jhazmat.2010.05.043 |
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