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首页> 外文期刊>Environmental Science & Technology >Effects of Metal Ions on the Reactivity and Corrosion Electrochemistry of Fe/FeS Nanoparticles
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Effects of Metal Ions on the Reactivity and Corrosion Electrochemistry of Fe/FeS Nanoparticles

机译：金属离子对Fe / FeS纳米粒子反应性和腐蚀电化学的影响

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摘要

Nano-zerovalent iron (nZVI) formed under sulfidic conditions results in a biphasic material (Fe/FeS) that reduces trichloroethene (TCE) more rapidly than nZVI associated only with iron oxides (Fe/FeO). Exposing Fe/FeS to dissolved metals (Pd~(2+), Cu~(2+), Ni~(2+), Co~(2+), and Mn~(2+)) results in their sequestration by coprecipitation as dopants into FeS and FeO and/or by electroless precipitation as zerovalent metals that are hydrogenation catalysts. Using TCE reduction rates to probe the effect of metal amendments on the reactivity of Fe/FeS, it was found that Mn~(2+) and Cu~(2+) decreased TCE reduction rates, while Pd~(2+), Co~(2+), and Ni~(2+) increased them. Electrochemical characterization of metal-amended Fe/FeS showed that aging caused passivation by growth of FeO and FeS phases and poisoning of catalytic metal deposits by sulfide. Correlation of rate constants for TCE reduction (k_(obs)) with electrochemical parameters (corrosion potentials and currents, Tafel slopes, and polarization resistance) and descriptors of hydrogen activation by metals (exchange current density for hydrogen reduction and enthalpy of solution into metals) showed the controlling process changed with aging. For fresh Fe/FeS, k_(obs) was best described by the exchange current density for activation of hydrogen, whereas k_(obs) for aged Fe/FeS correlated with electrochemical descriptors of electron transfer.
机译：在硫化条件下形成的纳米零价铁（nZVI）导致双相材料（Fe / FeS）还原三氯乙烯（TCE）的速度比仅与氧化铁（Fe / FeO）缔合的nZVI更快。将Fe / FeS暴露于溶解的金属（Pd〜（2 +），Cu〜（2 +），Ni〜（2 +），Co〜（2+）和Mn〜（2+））中会通过共沉淀而螯合作为掺杂剂掺入FeS和FeO中和/或通过无电沉淀作为零价金属（它们是氢化催化剂）。用TCE还原速率研究金属修饰剂对Fe / FeS反应性的影响，发现Mn〜（2+）和Cu〜（2+）降低TCE还原速率，而Pd〜（2 +），Co 〜（2+）和Ni〜（2+）使它们增加。金属修饰的Fe / FeS的电化学表征表明，时效会因FeO和FeS相的生长而引起钝化，并会因硫化物而使催化金属沉积物中毒。 TCE还原速率常数（k_（obs））与电化学参数（腐蚀电势和电流，Tafel斜率和极化电阻）和金属氢活化的描述符（用于氢还原的交换电流密度和溶液进入金属的焓）的相关性表明控制过程随老化而变化。对于新鲜的Fe / FeS，k_（obs）最好用氢激活的交换电流密度来描述，而老化的Fe / FeS的k_（obs）与电子转移的电化学描述有关。

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  • 来源
    《Environmental Science & Technology》 |2014年第7期|4002-4011|共10页
  • 作者

    Eun-Ju Kim; Jae-Hwan Kim; Yoon-Seok Chang; David Turcio-Ortega; Paul G. Tratnyek;

  • 作者单位

    School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea;

    School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea;

    School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea;

    Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon 97239, United States;

    Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon 97239, United States;

  • 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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