Degradation of tetracycline antibiotics: Mechanisms and Kinetic Studies for Advanced Oxidation/Reduction Processes

Title
Degradation of tetracycline antibiotics: Mechanisms and Kinetic Studies for Advanced Oxidation/Reduction Processes
Authors
Joonseon JeongWeihua SongWilliam J. Cooper정진영John Greaves
Keywords
destruction mechanism; advanced oxidation process; hydroxyl radical; hydrated electron; absolute rate constants; degradation efficiency; *2009년도 개인평가에 반영 완료
Issue Date
2010-01
Publisher
Chemosphere
Citation
VOL 78, NO 5, 533-540
Abstract
This study involves elucidating the destruction mechanisms of four tetracyclines via reactions with OH and solvated electrons (e-aq). The first step is to evaluate the bimolecular rate constants for the reaction of OH and e-aq. Transient absorption spectra for the intermediates formed by the reaction of OH were also measured over the time period of 1–250 μs to assist in selecting the appropriate wavelength for the absolute bimolecular reaction rate constants. For these four compounds, tetracycline, chlortetracycline, oxytetracycline, and doxycycline, the absolute rate constants with OH were (6.3 ± 0.1) × 109, (5.2 ± 0.2) × 109, (5.6 ± 0.1) × 109, and (7.6 ± 0.1) × 109 M−1 s−1, and for e-aq were (2.2 ± 0.1) × 1010, (1.3 ± 0.2) × 1010, (2.3 ± 0.1) × 1010, and (2.5 ± 0.1) × 1010 M−1 s−1, respectively. The efficiencies for OH reaction with the four tetracyclines ranged from 32% to 60%. The efficiencies for e-aq reaction were 15–29% except for chlortetracycline which was significantly higher (97%) than the other tetracyclines in spite of the similar reaction rate constants for in all cases. To evaluate the use of advanced oxidation/reduction processes for the destruction of tetracyclines it is necessary to have reaction rates, reaction efficiencies and destruction mechanisms. This paper is the first step in eventually realizing the formulation of a detailed kinetic destruction model for these four tetracycline antibiotics.
URI
http://pubs.kist.re.kr/handle/201004/36802
ISSN
0045-6535
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KIST Publication > Article
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