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- W3204557229 abstract "Due to its extremely high stability and continuous accumulation in the environment, which lead to a widespread environmental distribution, trifluoroacetic acid (TFA) is a global concern in ecosystems. In this study, TFA was decomposed through photoreduction by hydrated electrons (eaq−) with potassium iodide (KI) as a mediator in the aqueous phase. The reaction proceeded under irradiation at 254 nm in a solution with the following parameters: pH 11.0, anoxic conditions and room temperature (25℃). In 48 h, 91.4% ± 1.1% of the fluoride ions (F−) on all the TFA molecules in the UV/KI system were released, indicating the effective defluorination of TFA. Kinetic analysis indicated that TFA decomposition fit the first-order model with a rate constant of 0.147 ± 0.014 h−1. The optimal reaction conditions were 0.2 mM KI, 0.05 mM TFA and pH 11.0. In addition to fluoride ions (F-) and CO2, other intermediates, including formic acid (HCOO−) and acetic acid (CH3COO−), were identified and quantified in the aqueous phase by Ion chromatography (IC), and small amounts of gas-phase CF3H and CF4 were detected by gas chromatography-mass spectrometry (GC/MS). Finally, possible TFA degradation pathways were proposed. This method may be effective for the treatment of TFA in aquatic environments." @default.
- W3204557229 created "2021-10-11" @default.
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- W3204557229 date "2022-02-01" @default.
- W3204557229 modified "2023-10-14" @default.
- W3204557229 title "Photoreductive defluorination of trifluoroacetic acid (TFA) in the aqueous phase by hydrated electrons" @default.
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- W3204557229 doi "https://doi.org/10.1016/j.cej.2021.132724" @default.
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