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首页> 外文期刊>Environmental Science & Technology >Selective Capacitive Removal of Pb~(2+) from Wastewater over Redox-Active Electrodes
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Selective Capacitive Removal of Pb~(2+) from Wastewater over Redox-Active Electrodes

机译：在氧化还原活性电极上从废水中选择性电容去除Pb〜（2+）

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摘要

Water pollution has become an environmental hazard. Diverse metal cations exist in wastewater; lead is the most common heavy metal pollutant among them. Selective removal of highly toxic and ultradiluted lead ions from wastewater is a major challenge for water purification. Here, selective capacitive removal (SCR) of lead ions from wastewater over redox-active molybdenum dioxide/carbon (MoO_2/C) electrodes was developed by an environment-friendly asymmetric capacitive deionization (CDI) method. The MoO_2/C spheres act as cathodes of an asymmetric CDI device and effectively reduce the concentration of Pb~(2+) from 50 ppm to <0.21 ppb. Moreover, the SCR efficiency of lead ions over redox-active MoO_2/C electrodes is >99% in mixtures of 100 ppm Pb(NO_3)_2 and 100 ppm NaCl solutions. In addition, the electrodes exhibit high regeneration performance in mixtures of NaCl and Pb(NO_3)_2 and high SCR efficiency for lead ions from mixtures of heavy metal ions. The tetrahedral structure of the [MoO_4] lattice is shown to be more favorable for the intercalation of lead ions. In situ Raman spectroscopy further shows that the transition of the crystal interface between [MoO_6] and [MoO_4] cluster lattice could be electrochemically controlled during SCR. Therefore, this study provides a new direction for the SCR of lead ions from wastewater.
机译：水污染已成为危害环境。多样的金属阳离子的废水中存在的;铅是最常见的重金属其中的污染物。从废水中选择性地除去高毒性和ultradiluted铅离子的是用于水净化的一大挑战。在这里，从废水中过氧化还原活性的二氧化钼/碳（MoO_2 / C）电极的铅离子的选择性去除电容（SCR）由环境友好的非对称电容去离子（CDI）的方法发展。所述MoO_2 / C球体作为不对称CDI设备的阴极和有效地从50ppm的铅减少〜（2+）的浓度为<0.21 ppb的。此外，铅离子的过度氧化还原活性MoO_2 / C电极的SCR效率> 99％在100ppm的铅（NO_3）_2和100ppm的NaCl溶液的混合物。此外，该电极表现出在NaCl和Pb（NO_3）的混合物高的再生性能_2和高SCR效率从重金属离子的混合物铅离子。的[MoO_4]晶格中的四面体结构被示出为对铅离子的插入更为有利。原位拉曼光谱进一步示出了晶体界面的[MoO_6]和[MoO_4]之间的过渡簇晶格可以SCR过程中电化学控制。因此，本研究提供了一种用于从废水中铅离子的SCR的新方向。

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  • 来源
    《Environmental Science & Technology》 |2021年第1期|730-737|共8页
  • 作者

    Minlin Mao; Tingting Yan; Guorong Chen; Jianping Zhang; Liyi Shi; Dengsong Zhang;

  • 作者单位

    State Key Laboratory of Advanced Special Steel School of Materials Science and Engineering;

    State Key Laboratory of Advanced Special Steel School of Materials Science and Engineering;

    State Key Laboratory of Advanced Special Steel School of Materials Science and Engineering;

    State Key Laboratory of Advanced Special Steel School of Materials Science and Engineering;

    State Key Laboratory of Advanced Special Steel School of Materials Science and Engineering;

    State Key Laboratory of Advanced Special Steel School of Materials Science and Engineering;

  • 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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  • 正文语种 eng
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