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首页> 外文期刊>Environmental Science & Technology >Dynamics of Chromium(VI) Removal from Drinking Water by Iron Electrocoagulation
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Dynamics of Chromium(VI) Removal from Drinking Water by Iron Electrocoagulation

机译：铁电凝去除饮用水中六价铬的动力学

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摘要

The potential for new U.S. regulations for Cr(Ⅵ) in drinking water have spurred strong interests in improving technologies for Cr(Ⅵ) removal. This study examined iron electrocoagulation for Cr(VI) removal at conditions directly relevant to drinking water treatment. Cr(Ⅵ) is chemically reduced to less soluble Cr(Ⅲ) species by the Fe(Ⅱ) produced from an iron anode, and XANES spectra indicate that the Cr is entirely Cr(Ⅲ) in solid-phases produced in electrocoagulation. The dynamics of Cr(Ⅵ) removal in electrocoagulation at pH 6 and pH 8 at both oxic and anoxic conditions can be described by a new model that incorporates Fe(Ⅱ) release from the anode and heterogeneous and homogeneous reduction of Cr(Ⅵ) by Fe(Ⅱ). Heterogeneous Cr(Ⅵ) reduction by adsorbed Fe(Ⅱ) was critical to interpreting Cr(Ⅵ) removal at pH 6, and the Fe- and Cr-containing EC product was found to catalyze the redox reaction. Dissolved oxygen (DO) did not observably inhibit Cr(Ⅵ) removal because Fe(Ⅱ) reacts with DO more slowly than it does with Cr(Ⅵ), and Cr(Ⅵ) removal was faster at higher pH. Even in die presence of common groundwater solutes, iron electrocoagulation lowered Cr(Ⅵ) concentrations to levels well below California's 10 μg/ L.
机译：美国新的饮用水中Cr（Ⅵ）法规的潜力激发了人们对改进Cr（Ⅵ）去除技术的强烈兴趣。这项研究检查了在与饮用水处理直接相关的条件下铁电凝去除Cr（VI）的能力。 Cr（Ⅵ）被铁阳极产生的Fe（Ⅱ）化学还原成难溶的Cr（Ⅲ），XANES光谱表明在电凝过程中固相中Cr完全是Cr（Ⅲ）。一个新模型描述了在pH 6和pH 8下在电凝和缺氧条件下电凝过程中Cr（Ⅵ）的去除动力学，该模型结合了阳极中Fe（Ⅱ）的释放以及Cr（Ⅵ）的不均匀和均匀还原。铁（Ⅱ）。吸附的Fe（Ⅱ）对Cr（Ⅵ）的异质还原作用对于解释pH值为6时Cr（Ⅵ）的去除至关重要，并且发现含Fe和Cr的EC产物可催化氧化还原反应。溶解氧（DO）不能明显抑制Cr（Ⅵ）的去除，因为Fe（Ⅱ）与DO的反应比与Cr（Ⅵ）的反应更慢，并且在较高的pH值下Cr（Ⅵ）的去除更快。即使存在常见的地下水溶质，铁电凝也会将Cr（Ⅵ）的浓度降低到远低于加利福尼亚的10μg/ L的水平。

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  • 来源
    《Environmental Science & Technology》 |2016年第24期|13502-13510|共9页
  • 作者

    Chao Pan; Lyndsay D. Troyer; Jeffrey G. Catalano; Daniel E. Giammar;

  • 作者单位

    Department of Energy, Environmental and Chemical Engineering;

    Department of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, Missouri 63130, United States;

    Department of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental and Chemical 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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