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首页> 外文期刊>Environmental Science & Technology >Role of Reduced Sulfur in the Transformation of Cd(Ⅱ) Immobilized by δ-MnO_2
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Role of Reduced Sulfur in the Transformation of Cd(Ⅱ) Immobilized by δ-MnO_2

机译：减少硫在δ-mnO_2固定的CD（Ⅱ）转化中的作用

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摘要

Mn oxides are the major sinks for Cd(Ⅱ) in the aquatic environment. At the redox interface, reduced sulfur might affect the fate of sorbed Cd(Ⅱ) by either reducing Mn oxides or forming strong complexes with Cd(Ⅱ). Here, we investigated the fate of Cd(Ⅱ) immobilized on δ-MnO_2 affected by reduced sulfur (S~(2-) and cysteine). A low concentration of S~(2-) led to Cd(Ⅱ) migration from vacant sites to edge sites, while a high concentration of S~(2-) largely converted Cd(Ⅱ) adsorbed on the surface of δ-MnO_2 to CdS. At low pH, the cysteine addition led to the release of Cd(Ⅱ) initially adsorbed at the δ-MnO_2 vacant sites into the solution and caused the migration of a small portion of Cd(Ⅱ) to the δ-MnO_2 edge sites. At high pH, a high concentration of cysteine led to the detachment of Cd(Ⅱ) from δ-MnO_2, Cd(Ⅱ) readsorption by Mn(Ⅲ)-bearing minerals, and Cd-cysteine formation. Changes of Cd(Ⅱ) speciation were caused by δ-MnO_2 dissolution induced by reduced sulfur, the competition of generated Mn(Ⅱ/Ⅲ) for the adsorption sites, and the precipitation of Cd(Ⅱ) with reduced sulfur. This study indicates that reduced sulfur is a critical factor controlling the fate of Cd(Ⅱ) immobilized on Mn oxides in the aquatic environment.
机译：Mn氧化物是水生环境中CD（Ⅱ）的主要水槽。在氧化还原界面，通过还原Mn氧化物或用Cd形成强复合物（Ⅱ），减少硫可能影响吸附粘蛋白（Ⅱ）的命运（Ⅱ）。在此，我们研究了固定在受硫（S〜（2-）和半胱氨酸的δ-mnO_2上的CD（Ⅱ）的命运。低浓度的S〜（2-）导致CD（Ⅱ）从空置位点迁移到边缘位点，而高浓度的S〜（2-）的S〜（2-）大部分转化的CD（Ⅱ）吸附在δ-mnO_2的表面上CD。在低pH下，半胱氨酸加法导致最初吸附在δ-mnO_2空位位点的Cd（Ⅱ）释放到溶液中并导致一小部分Cd（Ⅱ）迁移到δ-mnO_2边缘位点。在高pH下，高浓度的半胱氨酸导致CD（Ⅱ）从δ-mnO_2，CD（Ⅱ）被Mn（Ⅲ） - 持续的矿物质和CD-半胱氨酸形成的脱离的脱离。 CD（Ⅱ）物种的变化是由硫磺所诱导的δ-mnO_2溶解引起的，其吸附位点的产生Mn（Ⅱ/Ⅲ）的竞争，以及CD（Ⅱ）的沉淀，减少硫磺。该研究表明，减少的硫是控制在水生环境中固定在Mn氧化物上的CD（Ⅱ）的命运的关键因素。

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  • 来源
    《Environmental Science & Technology》 |2020年第23期|14955-14963|共9页
  • 作者

    Qian Sun; Peixin Cui; Song Wu; Cun Liu; Tingting Fan; Marcelo Eduardo Alves; Hu Cheng; Meiying Huang; Dongmei Zhou; Yujun Wang;

  • 作者单位

    Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science The Chinese Academy of Sciences Nanjing 210008 China University of Chinese Academy of Sciences Beijing 100049 China;

    Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science The Chinese Academy of Sciences Nanjing 210008 China;

    State Key Laboratory of Pollution Control and Resource Research School of Environment Nanjing University Nanjing 210008 China;

    Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science The Chinese Academy of Sciences Nanjing 210008 China;

    Ministry of Environmental Protection of the People's Republic of China Nanjing Institute of Environmental Sciences Nanjing 210008 China;

    Department of Exact Sciences 'Luiz de Queiroz' Agricultural College ESALQ/USP Piracicaba Sao Paulo 13418-900 Brazil;

    College of Biology and the Environment Nanjing Forestry University Nanjing 210037 China;

    Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science The Chinese Academy of Sciences Nanjing 210008 China University of Chinese Academy of Sciences Beijing 100049 China;

    Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science The Chinese Academy of Sciences Nanjing 210008 China;

    Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science The Chinese Academy of Sciences Nanjing 210008 China University of Chinese Academy of Sciences Beijing 100049 China;

  • 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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