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首页> 外文期刊>Environmental Science & Technology >Reductive Defluorination of Perfluorooctane Sulfonate
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Reductive Defluorination of Perfluorooctane Sulfonate

机译：全氟辛烷磺酸的还原脱氟

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摘要

Perfluorooctane sulfonate (PFOS) is under increased scrutiny as an environmental pollutant due to recent reports of its worldwide distribution, environmental persistence, and bioaccumulation potential. The susceptibility of technical PFOS and PFOS branched isomers to chemical reductive dehalogenation with vitamin B_(12) (260 μM) as catalyst and Ti(lll)-citrate (36 mM) as bulk reductant in anoxic aqueous solution at 70 ℃ and pH 9 was evaluated in this study. Defluorination was confirmed by fluoride release measurements of 18% in technical PFOS, equivalent to the removal 3 mol F~-/mol PFOS, and 71% in PFOS branched isomers equivalent to the removal of 12 mol F~-/mol PFOS. Degradation of PFOS was further confirmed by monitoring the disappearance of PFOS compounds with reaction time by suppressed conductivity ion chromatography, LC-MS/MS, and ~(19)F NMR studies. The PFOS compounds differed in their susceptibility to reductive degradation by vitamin B_(12)/Ti(lll) citrate. Chromatographic peaks corresponding to branched PFOS isomers disappeared whereas the peak corresponding to linear PFOS was stable. To our knowledge this is the first report of reductive dehalogenation of PFOS catalyzed by a biomolecule.
机译：由于最近有关其全球分布，环境持久性和生物蓄积潜力的报道，全氟辛烷磺酸（PFOS）作为一种环境污染物正受到越来越多的审查。在70℃和pH值为9的条件下，以维生素B_（12）（260μM）作为催化剂和柠檬酸Ti（III）（36 mM）作为本体还原剂，工业PFOS和PFOS支链异构体对化学还原脱卤的敏感性为在这项研究中进行了评估。氟的释放通过工业用全氟辛烷磺酸的释放量测定为18％，相当于除去了3 mol F- / mol PFOS，而在PFOS支链异构体中为71％，相当于除去了12 mol F- / mol PFOS。通过抑制电导率离子色谱，LC-MS / MS和〜（19）F NMR研究，通过监测反应时间下PFOS化合物的消失，进一步证实了PFOS的降解。 PFOS化合物对柠檬酸维生素B_（12）/ Ti（III）还原降解的敏感性不同。对应于支化PFOS异构体的色谱峰消失了，而对应于线性PFOS的色谱峰却稳定了。据我们所知，这是生物分子催化的全氟辛烷磺酸还原脱卤的首次报道。

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