DOI: 10.1016/j.watres.2017.10.020
Scopus记录号: 2-s2.0-85032011729
论文题名: Effects of the antioxidant moieties of dissolved organic matter on triplet-sensitized phototransformation processes: Implications for the photochemical modeling of sulfadiazine
作者: Vione D. ; Fabbri D. ; Minella M. ; Canonica S.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 128 起始页码: 38
结束页码: 48
语种: 英语
英文关键词: Antioxidants
; Dissolved organic matter
; Electron donating capacity
; Environmental photochemistry
; Sulfadiazine
Scopus关键词: Antioxidants
; Biogeochemistry
; Dissolution
; Organic carbon
; Photodegradation
; Photolysis
; Sulfur compounds
; Water treatment
; 2 ,4 ,6-trimethylphenol
; Chromophoric dissolved organic matter
; Dissolved organic carbon
; Dissolved organic matters
; Electron-donating
; Environmental photochemistries
; Phototransformation process
; Sulfadiazine
; Biological materials
; dissolved organic matter
; organic carbon
; phenol derivative
; sulfadiazine
; surface water
; antiinfective agent
; antioxidant
; sulfadiazine
; sulfonamide
; antioxidant
; degradation
; dissolved organic matter
; parameterization
; phenolic compound
; photochemistry
; photodegradation
; photolysis
; transformation
; antioxidant activity
; Article
; biotransformation
; drug degradation
; electron
; irradiation
; photochemistry
; photodegradation
; photolysis
; photosensitization
; phototransformation
; prediction
; priority journal
; reduction (chemistry)
; water sampling
; analysis
; chemistry
; half life time
; photochemistry
; radiation response
; sunlight
; water pollutant
; Anti-Bacterial Agents
; Antioxidants
; Half-Life
; Photochemical Processes
; Photolysis
; Sulfadiazine
; Sulfonamides
; Sunlight
; Water Pollutants, Chemical
英文摘要: Previous studies have shown that the photodegradation of some pollutants, induced by the excited triplet states of chromophoric dissolved organic matter (3CDOM*), can be inhibited by back-reduction processes carried out by phenolic antioxidants occurring in dissolved organic matter (DOM). Here, for the first time to our knowledge, we included such an inhibition effect into a photochemical model and applied the model predictions to sulfadiazine (SDZ), a sulfonamide antibiotic that occurs in surface waters in two forms, neutral HSDZ and anionic SDZ− (pKa = 6.5). The input parameters of the photochemical model were obtained by means of dedicated experiments, which showed that the inhibition effect was more marked for SDZ− than for HSDZ. Compared to the behavior of 2,4,6-trimethylphenol, which does not undergo antioxidant inhibition when irradiated in natural water samples, the back-reduction effect on the degradation of SDZ was proportional to the electron-donating capacity of the DOM. According to the model results, direct photolysis and [rad]OH reaction would account for the majority of both HSDZ and SDZ− photodegradation in waters having low dissolved organic carbon (DOC < 1 mgC L−1). With higher DOC values (>3–4 mgC L−1) and despite the back-reduction processes, the 3CDOM* reactions are expected to account for the majority of HSDZ phototransformation. In the case of SDZ− at high DOC, most of the photodegradation would be accounted for by direct photolysis. The relative importance of the triplet-sensitized phototransformation of both SDZ− and (most importantly) HSDZ is expected to increase with increasing DOC, even in the presence of back reduction. An increase in water pH, favoring the occurrence of SDZ− with respect to HSDZ, would enhance direct photolysis at the expense of triplet sensitization. SDZ should be fairly photolabile under summertime sunlight, with predicted half-lives ranging from a few days to a couple of months depending on water conditions. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113134
Appears in Collections: 气候减缓与适应
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作者单位: Dipartimento di Chimica, Università degli Studi di Torino, Via P. Giuria 5, Turin, I-10125, Italy; Università di Torino, Centro Interdipartimentale NatRisk, Largo Paolo Braccini 2, Grugliasco (TO), I-10095, Italy; Eawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstrasse 133, Dübendorf, CH-8600, Switzerland
Recommended Citation:
Vione D.,Fabbri D.,Minella M.,et al. Effects of the antioxidant moieties of dissolved organic matter on triplet-sensitized phototransformation processes: Implications for the photochemical modeling of sulfadiazine[J]. Water Research,2018-01-01,128