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首页> 外文期刊>Environmental Science & Technology >Breakdown Products from Perfluorinated Alkyl Substances (PFAS) Degradation in a Plasma-Based Water Treatment Process
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Breakdown Products from Perfluorinated Alkyl Substances (PFAS) Degradation in a Plasma-Based Water Treatment Process

机译：等离子水处理过程中全氟烷基物质（PFAS）降解的分解产物

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摘要

Byproducts produced when treating perfluorooctanoic acid (PFOA) and perfluorooctanesulfonate (PFOS) in water using a plasma treatment process intentionally operated to treat these compounds slowly to allow for byproduct accumulation were quantified. Several linear chain perfluoroalkyl carboxylic acids (PFCAs) (C4 to C7) were identified as byproducts of both PFOA and PFOS treatment. PFOA, perfluorohexanesulfonate (PFHxS), and perfluorobutanesulfonate (PFBS) were also found to be byproducts from PFOS degradation. Significant concentrations of fluoride ions, inorganic carbon, and smaller organic acids (trifluoroacetic acid, acetic acid, and formic acid) were also identified. In addition to PFCAs, PFHxS, and PFBS, trace amounts of 43 PFOA-related and 35 PFOS-related byproducts were also identified using a screening and search-based algorithm. Minor concentrations of gas-phase byproducts were also identified (2.5% of the F originally associated with the parent molecules) some of which are reported for the first time in perfluoroalkyl substance degradation experiments including cyclic perfluoroalkanes (C4F8, C5F10, C6F12, C7F14, and C8F16). The short chain PFCAs detected suggest the occurrence of a stepwise reduction of the parent perfluoroalkyl substances (PFAS) molecule, followed by oxidation of intermediates, perfluoroalkyl radicals, and perfluoro alcohols/ketones. Using a fluorine mass balance, 77% of the fluorine associated with the parent PFOA and 58% of the fluorine associated with the parent PFOS were identified. The bulk of the remaining fluorine was determined to be sorbed to reactor walls and tubing using sorption experiments in which plasma was not generated.
机译：使用等离子处理工艺在水中处理全氟辛酸（PFOA）和全氟辛烷磺酸盐（PFOS）时产生的副产物被定量，这些等离子体处理过程是故意缓慢处理这些化合物以允许副产物积累的。几种直链全氟烷基羧酸（PFCA）（C4至C7）被确定为PFOA和PFOS处理的副产物。还发现全氟辛烷磺酸，全氟己烷磺酸盐（PFHxS）和全氟丁烷磺酸盐（PFBS）是PFOS降解的副产物。还确定了高浓度的氟离子，无机碳和较小的有机酸（三氟乙酸，乙酸和甲酸）。除了PFCA，PFHxS和PFBS，还使用基于筛选和搜索的算法鉴定了痕量的43种PFOA相关和35种PFOS相关副产物。还鉴定出了少量的气相副产物（最初与母体分子缔合的F的<2.5％），其中一些是在全氟烷基物质降解实验中首次报道的，包括环状全氟烷烃（C4F8，C5F10，C6F12，C7F14，和C8F16）。检测到的短链PFCA表明母体全氟烷基物质（PFAS）分子逐步还原，然后氧化中间体，全氟烷基和全氟醇/酮。使用氟质量平衡，鉴定出77％的与母体PFOA缔合的氟和58％的与母体PFOS缔合的氟。使用其中不产生等离子体的吸附实验，确定剩余的大部分氟被吸附到反应器壁和管道上。

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  • 来源
    《Environmental Science & Technology》 |2019年第5期|2731-2738|共8页
  • 作者

    Singh Raj Kamal; Fernando Sujan; Baygi Sadjad Fakouri; Multari Nicholas; Thagard Selma Mededovic; Holsen Thomas M.;

  • 作者单位

    Clarkson Univ, Dept Chem & Biomol Engn, Plasma Res Lab, Potsdam, NY 13699 USA;

    Clarkson Univ, Dept Civil & Environm Engn, Potsdam, NY 13699 USA;

    Clarkson Univ, Dept Civil & Environm Engn, Potsdam, NY 13699 USA;

    Clarkson Univ, Dept Chem & Biomol Engn, Plasma Res Lab, Potsdam, NY 13699 USA;

    Clarkson Univ, Dept Chem & Biomol Engn, Plasma Res Lab, Potsdam, NY 13699 USA;

    Clarkson Univ, Dept Civil & Environm Engn, Potsdam, NY 13699 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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