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首页> 外文期刊>Environmental Science & Technology >Oxidation of Triclosan by Permanganate (Mn(VII)): Importance of ligands and In Situ Formed Manganese Oxides
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Oxidation of Triclosan by Permanganate (Mn(VII)): Importance of ligands and In Situ Formed Manganese Oxides

机译：高锰酸盐（Mn（VII））氧化三氯生：配体和原位形成的锰氧化物的重要性

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摘要

Experiments were conducted to examine permanganate (Mn(VII); KMnO_4) oxidation of the widely used biocide triclosan (one phenolic derivative) in aqueous solution at pH values of 5-9. Under slightly acidic conditions, the reactions displayed autocatalysis, suggesting the catalytic role of in situ formed MnO_2. This was further supported by the promoting effects of the addition of preformed MnO_2 colloids on Mn(VII) oxidations of triclosan and two other selected phenolics (i.e., phenol and 2,4-dichlorophenol), as well as p-nitrophenol which otherwise showed negligible reactivity toward Mn(VII) and MnO_2 colloids, respectively. Surprisingly, phosphate buffer significantly enhanced Mn(VII) oxidation of triclosan, as well as phenol and 2,4-dichlorophenol over a wide pH range. Further, several other selected ligands (i.e., pyrophosphate, EDTA, and humic acid) also exerted oxidation enhancement, supporting a scenario where highly active aqueous manganese intermediates (Mn(INT)_(aq)) formed in situ upon Mn(VII) reduction might be stabilized to a certain extent in the presence of ligands and subsequently involved in further oxidation of target phenolics, whereas without stabilizing agents Mn(INT)_(aq)autodecomposes or disproportionates spontaneously. The effectiveness of Mn(VII) for the oxidative removal of triclosan in natural water and wastewater was confirmed. Their background matrices were also found to accelerate Mn(VII) oxidation of phenolics.
机译：进行实验以检查在pH值为5-9的水溶液中广泛使用的杀菌剂三氯生（一种酚类衍生物）的高锰酸盐（Mn（VII）; KMnO_4）氧化。在弱酸性条件下，反应表现出自催化作用，表明原位形成的MnO_2具有催化作用。添加预制的MnO_2胶体对三氯生和其他两种选定的酚类化合物（即苯酚和2,4-二氯苯酚）以及对硝基苯酚的Mn（VII）氧化的促进作用进一步证明了这一点，否则对硝基苯酚可忽略不计对Mn（VII）和MnO_2胶体的反应活性。令人惊讶的是，磷酸盐缓冲剂在很宽的pH范围内显着增强了三氯生以及苯酚和2,4-二氯苯酚的Mn（VII）氧化。此外，其他几种选定的配体（即焦磷酸盐，EDTA和腐殖酸）也发挥了氧化作用，支持了在还原Mn（VII）后就地形成高活性锰水溶液中间体（Mn（INT）_（aq））的情况。可能在配体存在下稳定到一定程度，然后参与目标酚的进一步氧化，而在没有稳定剂的情况下，Mn（INT）_（aq）会自发分解或歧化。证实了锰（VII）能够有效去除天然水和废水中的三氯生。还发现了它们的背景基质可促进酚类化合物的Mn（VII）氧化。

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  • 来源
    《Environmental Science & Technology》 |2009年第21期|8326-8331|共6页
  • 作者

    JIN HANG; SU-YAN PANG; JUN MA;

  • 作者单位

    State Key Laboratory of Urban Water Resource and Environment, National Engineering Research Center of Urban Water Resources, Harbin Institute of Technology, Harbin 150090, China;

    State Key Laboratory of Urban Water Resource and Environment, National Engineering Research Center of Urban Water Resources, Harbin Institute of Technology, Harbin 150090, China Environmental Science and Engineering Research Center, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China;

    State Key Laboratory of Urban Water Resource and Environment, National Engineering Research Center of Urban Water Resources, Harbin Institute of Technology, Harbin 150090, China;

  • 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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