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- W2898084354 abstract "The frequent detection of propranolol, a widely used β-blocker, in wastewater effluents and surface waters has raised serious concern, due to its adverse effects on organisms. UV/hydrogen peroxide (UV/H2O2) and UV/persulfate (UV/PDS) processes are efficient in eliminating propranolol in various waters, but the formation of oxidation products in these processes, as well as the assessment of their toxicity, has not been systematically addressed. In this study, we identified and compared transformation products of propranolol produced by hydroxyl radical (•OH) and sulfate radical (SO4•-). The electrostatic attraction enhances the reaction between SO4•- and the protonated form of propranolol, while •OH shows non-selectivity toward both protonated and neutral propranolol species. The hydroxylation of propranolol by •OH occurs at either amine moiety or naphthalene group while SO4•- favors the oxidation of the electron-rich naphthalene group. Further oxidation by •OH and SO4•- results in ring-opening products. Bicarbonate and chloride exert no effect on propranolol degradation. The generation of CO3•- and Cl-containing radicals is favorable to oxidizing naphthalene group. The acute toxicity assay of Vibrio fischeri suggests that SO4•- generates more toxic products than •OH, while CO3•- and Cl-containing radicals produce similar toxicity as SO4•-. High concentrations of bicarbonate in UV/H2O2 increase the toxicity of treated solution." @default.
- W2898084354 created "2018-11-02" @default.
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- W2898084354 date "2019-02-01" @default.
- W2898084354 modified "2023-10-16" @default.
- W2898084354 title "Comparative study on degradation of propranolol and formation of oxidation products by UV/H2O2 and UV/persulfate (PDS)" @default.
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- W2898084354 doi "https://doi.org/10.1016/j.watres.2018.08.074" @default.
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