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首页> 外文期刊>Environmental Science & Technology >Mechanisms of Humic Acid Fouling on Capacitive and Insertion Electrodes for Electrochemical Desalination
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Mechanisms of Humic Acid Fouling on Capacitive and Insertion Electrodes for Electrochemical Desalination

机译：电化学海水淡化电容和插入电极上腐殖酸结垢的机理

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摘要

Though electrochemical deionization technologies have been widely explored for brackish water desalination and selective ion removal, their sustained performance in the presence of foulants common to environmental waters remains unclear. This study investigates the fundamental mechanisms by which carbonaceous electrodes used in capacitive deionization and insertion electrodes used for high-capacity selective ion removal are affected by the presence of humic acid (HA). We evaluate HA adsorption behavior and the resulting impact on the ion storage capacity and cycling stability of the electrode materials. We find that HA is primarily adsorbed to the mesopores of two carbonaceous electrodes with distinctly different pore structures, but that the ion storage and transport properties of the electrodes are not significantly impacted by HA adsorption. In contrast, HA adsorption resulted in sharp capacity decay for the insertion (Na4Mn9O18) electrode. We attribute this decay to both hindered Na+ ion diffusion to the insertion interface in the presence of adsorbed HA, as well as HA mediated electrode dissolution. These findings highlight the contrasting mechanisms for HA fouling of capacitive and insertion electrodes and suggest that insertion electrodes may be more susceptible to performance decline in electrochemical deionization of environmental waters.
机译：尽管电化学去离子技术已被广泛地用于咸水淡化和选择性离子去除，但在环境水常见污垢的存在下它们的持续性能仍不清楚。这项研究调查了腐植酸（HA）的存在影响着电容性去离子用碳质电极和高容量选择性离子去除用插入电极的基本机理。我们评估HA的吸附行为以及由此产生的对离子存储容量和电极材料循环稳定性的影响。我们发现HA主要吸附到具有明显不同的孔结构的两个碳质电极的中孔中，但是HA吸附不会显着影响电极的离子存储和传输性能。相反，HA吸附导致插入（Na4Mn9O18）电极的容量急剧下降。我们将此衰减归因于在存在吸附的HA的情况下阻碍Na +离子扩散至插入界面，以及HA介导的电极溶解。这些发现突出了电容电极和插入电极的HA污染的对比机制，并表明插入电极在环境水的电化学去离子中可能更容易受到性能下降的影响。

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  • 来源
    《Environmental Science & Technology》 |2018年第21期|12633-12641|共9页
  • 作者

    Liu Xitong; Whitacre Jay F.; Mauter Meagan S.;

  • 作者单位

    Carnegie Mellon Univ, Scott Inst Energy Innovat, 5000 Forbes Ave, Pittsburgh, PA 15213 USA;

    Carnegie Mellon Univ, Dept Mat Sci & Engn, 5000 Forbes Ave, Pittsburgh, PA 15213 USA;

    Carnegie Mellon Univ, Dept Civil & Environm Engn, 5000 Forbes Ave, Pittsburgh, PA 15213 USA;

    Carnegie Mellon Univ, Dept Engn & Publ Policy, 5000 Forbes Ave, Pittsburgh, PA 15213 USA;

  • 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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