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Oxygen-induced efficient mineralization of perfluoroalkylether sulfonates in subcritical water

机译：氧诱导亚临界水中全氟烷基醚磺酸盐的有效矿化

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摘要

The decomposition of perfluoroalkylether sulfonates C_2F_5OC_2F_4SO_3~- and C_3F_7OC_2F_4SO_3~- in subcritical water was investigated, and the results were compared with those for perfluorobutanesulfonate (C_4F_9SO_3~-), which has no ether linkage. This is the first report on the use of subcritical water to decompose perfluoroalkylether sulfonates, which are being developed as alternative surfactants to environmentally persistent and bioaccumulative perfluoroalkylsulfonates. Whereas C_4F_9SO_3~- showed little reactivity in subcritical water, C_2F_5OC_2F_4SO_3~- decomposed efficiently in subcritical water (～350℃) in the presence of oxygen gas to form F~- and SO_4~(2-) in the aqueous phase and CO_2 in the gas phase as major products. Trifluoroacetic acid (CF_3COOH, TFA) and trifluoromethane (CF_3H) were also detected as minor products in the aqueous and gas phases, respectively. Similar decomposition behavior was observed for C_3F_7OC_2F_4SO_3~-, which decomposed at a rate that was somewhat higher than that of C_2F_5OC_2F_4SO_3~-. When argon was used in place of oxygen gas, the time profile of the decrease in the amount of C_2F_5OC_2F_4SO_3~-remained almost unchanged, but the product distribution changed markedly: the amounts of F~-, SO_4~(2-), and CO_2 dramatically decreased, the amounts of TFA and CF_3H increased, and a new product, HCF_2SO_3~-, was detected. These results clearly indicate that treatment with subcritical water in the presence of oxygen gas effectively mineralized perfluoroalkylether sulfonates to F~-, SO_4~(2-), and CO_2. On the basis of a product analysis, we propose a decomposition mechanism.
机译：研究了全氟烷基醚磺酸盐C_2F_5OC_2F_4SO_3〜-和C_3F_7OC_2F_4SO_3〜-在亚临界水中的分解结果，并与没有醚键的全氟丁烷磺酸盐（C_4F_9SO_3〜-）进行了比较。这是有关使用亚临界水分解全氟烷基醚磺酸盐的第一份报告，该文献正在开发为环境持久性和生物累积性全氟烷基磺酸盐的替代表面活性剂。 C_4F_9SO_3〜-在亚临界水中几乎没有反应性，而C_2F_5OC_2F_4SO_3〜-在氧气存在的情况下在亚临界水中（〜350℃）有效分解，形成F〜-和SO_4〜（2-），在水相中形成CO_2。气相作为主要产品。三氟乙酸（CF_3COOH，TFA）和三氟甲烷（CF_3H）在水相和气相中也分别作为次要产物被检测到。对于C_3F_7OC_2F_4SO_3〜-，观察到类似的分解行为，其分解速率略高于C_2F_5OC_2F_4SO_3〜-。当用氩气代替氧气时，C_2F_5OC_2F_4SO_3〜减少量的时间变化几乎保持不变，但产物分布变化明显：F〜-，SO_4〜（2-）和CO_2的减少量急剧下降，TFA和CF_3H的含量增加，并且检测到新产物HCF_2SO_3〜-。这些结果清楚地表明，在氧气存在下用亚临界水处理可以将全氟烷基醚磺酸盐有效地矿化为F_，SO_4〜（2-）和CO_2。在产品分析的基础上，我们提出了一种分解机制。

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  • 来源
    《Chemosphere》 |2009年第10期|1400-1405|共6页
  • 作者

    Hisao Hori; Misako Murayama; Shuzo Kutsuna;

  • 作者单位

    National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba West, 16-1 Onogawa, Tsukuba 305-8569, Japan;

    National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba West, 16-1 Onogawa, Tsukuba 305-8569, Japan;

    National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba West, 16-1 Onogawa, Tsukuba 305-8569, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fluorine; surfactant; mineralization; PFOS; PFOA; alternative;

    机译：氟;表面活性剂矿化全氟辛烷磺酸;PFOA;另类;

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