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首页> 外文期刊>Environmental Science & Technology >Efficient Photocatalytic Decomposition of Perfluorooctanoic Acid by Indium Oxide and Its Mechanism
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Efficient Photocatalytic Decomposition of Perfluorooctanoic Acid by Indium Oxide and Its Mechanism

机译：氧化铟对全氟辛酸的光催化分解及其机理

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摘要

Perfluorooctanoic acid (C_7F_(15)COOH, PFOA) has increasingly attracted worldwide concerns due to its global occurrence and resistance to most conventional treatment processes. Though TiO_2-based photocatalysis is strong enough to decompose most organics, it is not effective for PFOA decomposition. We first find that indium oxide (In_2O_3) possesses significant activity for PFOA decomposition under UV irradiation, with the rate constant about 8.4 times higher than that by TiO_2. The major intermediates of PFOA were C_2-C_7 shorter-chain perfluorocarboxylic acids, implying that the reaction proceeded in a stepwise manner. By using diffuse reflectance infrared Fourier transform spectroscopy, ~(19)F magic angle spinning nuclear magnetic resonance, and electron spin resonance, we demonstrate that the terminal carboxylate group of PFOA molecule tightly coordinates to the In_2O_3 surface in a bidentate or bridging configuration, which is beneficial for PFOA to be directly decomposed by photogenerated holes of In_O_3 under UV irradiation, while PFOA coordinates to TiO_2 in a monodentate mode, and photogenerated holes of TiO_2 preferentially transform to hydroxyl radicals, which are inert to react with PFOA PFOA decomposition in wastewater was inhibited by bicarbonate and other organic matters; however, their adverse impacts can be mostly avoided via pH adjustment and ozone addition.
机译：全氟辛酸（C_7F_（15）COOH，PFOA）由于其全球通用性以及对大多数常规处理工艺的抵抗力，因此越来越引起全球关注。尽管基于TiO_2的光催化作用足以分解大多数有机物，但它对PFOA分解无效。我们首先发现，氧化铟（In_2O_3）在紫外线照射下具有明显的PFOA分解活性，其速率常数比TiO_2高8.4倍。 PFOA的主要中间体是C_2-C_7短链全氟羧酸，这表明反应是逐步进行的。通过使用漫反射红外傅里叶变换光谱，〜（19）F幻角旋转核磁共振和电子自旋共振，我们证明了PFOA分子的末端羧酸根基团以双齿或桥接构型紧密地与In_2O_3表面配合，有利于PFOA在UV辐射下被In_O_3的光生空穴直接分解，而PFOA以单齿模式配位到TiO_2，并且TiO_2的光生空穴优先转变为羟基，这与废水中的PFOA分解反应呈惰性。被碳酸氢盐和其他有机物抑制；但是，通过调节pH值和添加臭氧可以基本避免它们的不利影响。

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  • 来源
    《Environmental Science & Technology》 |2012年第10期|p.5528-5534|共7页
  • 作者

    Xiaoyun Li; Pengyi Zhang; Ling Jin; Tian Shao; Zhenmin Li; Junjie Cao;

  • 作者单位

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, 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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