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Kinetics of the Reductive Dissolution of Lead(IV) Oxide by Iodide

机译：碘化物对氧化铅（IV）的还原溶解动力学

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摘要

Lead(IV) oxide (PbO_2) is a corrosion product found in lead service lines used to convey drinking water. The presence of reductants can accelerate PbO_2 dissolution and enhance lead release to drinking water. The dissolution rate rather than the equilibrium solubility of PbO, can control the dissolved lead concentrations in water distributed through pipes containing PbO_2. Iodide, a known reductant for PbO_2, was selected as a model reductant for investigating the kinetics and mechanisms of the reductive dissolution of PbO_2. The dissolution rate of plattnerite (β-PbO_2) was determined as a function of pH, iodide concentration, and dissolved inorganic carbon (DIC) concentration using continuously stirred tank reactors. The dissolution rate of plattnerite increased with decreasing pH and increasing iodide concentrations. The presence of 10 mg C/L DIC accelerated plattnerite dissolution, but further increases in DIC concentration did not affect the dissolution rate. The reductive dissolution of PbO_2 can be interpreted as a coupled process involving chemical reduction of Pb~Ⅳ to Pb~Ⅱ at the PbO_2 surface followed by detachment of Pb~Ⅱ to solution. The data suggest that chemical reduction is the rate-limiting step for PbO_2 dissolution in the presence of iodide.
机译：氧化铅（PbO_2）是用于输送饮用水的铅服务管线中发现的腐蚀产物。还原剂的存在可以加速PbO_2的溶解并增强铅向饮用水的释放。溶解速率而不是PbO的平衡溶解度可以控制通过含PbO_2的管道分配的水中溶解的铅浓度。选择碘化物（一种已知的PbO_2还原剂）作为模型还原剂，以研究PbO_2还原溶解的动力学和机理。使用连续搅拌釜式反应器，确定了锂白铁矿（β-PbO_2）的溶解速率与pH，碘化物浓度和溶解的无机碳（DIC）浓度的关系。铂石的溶解速率随着pH值的降低和碘化物浓度的增加而增加。 10 mg C / L DIC的存在加速了铂矿的溶解，但是DIC浓度的进一步增加并未影响溶解速率。 PbO_2的还原溶解可以解释为一个耦合过程，包括在PbO_2表面将Pb〜Ⅳ化学还原为Pb〜Ⅱ，然后使Pb〜Ⅱ脱离。数据表明化学还原是碘化物存在下PbO_2溶解的限速步骤。

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  • 来源
    《Environmental Science & Technology》 |2012年第11期|p.5859-5866|共8页
  • 作者

    Yin Wang; Jiewei Wu; Daniel E.Giammar;

  • 作者单位

    Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, Campus Box 1180, One Brookings Drive, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, Campus Box 1180, One Brookings Drive, St. Louis, Missouri 63130, United States;

    Department of Energy, Environmental, and Chemical Engineering, Washington University in St. Louis, Campus Box 1180, One Brookings Drive, St. Louis, Missouri 63130, 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);
  • 原文格式 PDF
  • 正文语种 eng
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