Enhanced transformation of aquatic organic compounds by long-lived photooxidants (LLPO) produced from dissolved organic matter
نویسندگان
چکیده
• Transformation kinetics of several organic compounds photosensitized by DOM Enhanced transformation electron-rich at lower initial concentration Effect attributed to DOM-derived long-lived photooxidants (LLPO) Reduction potential LLPO estimated in the range 1.0 − 1.3 V vs. SHE Photochemically produced phenoxyl radicals mimic effect Dissolved matter (DOM) plays a crucial role photochemical contaminants natural aquatic systems. The present study focuses on characterization specific previously observed for phenols, consisting an acceleration DOM-photosensitized target low concentrations (< 1 µM). This was hypothesized be caused "long-lived" (LLPO). Pseudo-first-order rate constants anilines, sulfonamide antibiotics and phenylureas Suwannee River fulvic acid were determined under steady−state irradiation using UVA visible wavelengths from medium-pressure mercury lamp. A significant enhancement (by factor 2.4 16) first-order constant various 0.1 μM compared 5 . points relevant reactivity these with LLPO. For phenols anilines occurred only above certain standard one-electron oxidation potentials. From data series reduction versus hydrogen electrode. are proposed mainly consist formed photooxidation electron-poor phenolic moieties DOM. plausibility this hypothesis successfully tested studying 3,4-dimethoxyphenol aqueous solutions containing model photosensitizer (2-acetonaphthone) phenol (4-cyanophenol) as surrogates.
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ژورنال
عنوان ژورنال: Water Research
سال: 2021
ISSN: ['0043-1354', '1879-2448']
DOI: https://doi.org/10.1016/j.watres.2020.116707