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首页> 外文期刊>Environmental Science & Technology >Fe-Mn Oxides Based Multifunctional Adsorptive/Electrosensing Nanoplatforms: Dynamic Site Rearrangement for Metal Ion Selectivity
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Fe-Mn Oxides Based Multifunctional Adsorptive/Electrosensing Nanoplatforms: Dynamic Site Rearrangement for Metal Ion Selectivity

机译：基于Fe-Mn氧化物的多功能吸附/冷致梳素：金属离子选择性的动态位点重排

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摘要

Achieving structural requirements for the exclusive selectivity of adsorbent to a specific metal remains challenging, as certain metal ions show similar adsorptive behaviors and preference toward a given site. We reported the morphology and oxidation state-dependent selectivity manipulating of layered oxides by controlling the dynamic evolution of different adsorptive sites. The computational investigation predicted the site-specific partitioning trends of metal ions at two sites of manganese oxide (MnO_2) layers: the lateral edge sites (LESs) and octahedral vacancy sites (OVSs). In contrast to the predominant occupation of the OVSs for other metal ions, the binding of lead (Pb) ions was energetically favored at both the sites. We assembled ultrathin MnO_2 nanosheets on the magnetic iron oxides to first enhance the accessibility of the LESs. A sequential ligand-promoted partial reduction of the atomic MnO_2 layers induced the edge-to-interlayer migration of Mn atoms to block the nonspecific OVSs and activate the LESs, enabling a superior selectivity to Pb. In addition, the iron oxides helped construct a multifunctional adsorptive/electrosensing platform for Pb regarding their facile magnetic separation and electrochemical activity. Simultaneous selective adsorption and on-site monitoring of Pb(Ⅱ) were achieved on this nanoplatform, owing to its satisfactory stability and sensitivity without an obvious matrix effect.
机译：由于某些金属离子显示出类似的吸附行为和朝向给定部位的相似性行为和偏好，实现对特定金属的专用选择性的结构要求仍然具有挑战性。通过控制不同吸附位点的动态演变，我们报道了操纵层状氧化物的形态和氧化状态依赖性选择性。计算调查预测了氧化锰（MNO_2）层的两个位点（MNO_2）层（较少）和八面体空位位点（OVSS）的位点特异性分区趋势。与其他金属离子的OVSS的主要占用相反，铅（Pb）离子的结合在两个位点上有机充满青睐。我们在磁性铁氧化物上组装了超薄MNO_2纳米片，首先增强了较少的可达性。序贯配体促进的原子MnO_2层的部分减少诱导Mn原子的边缘与中间层迁移以阻断非特异性OVS并激活较少的，使得能够优异的PB选择性。此外，氧化铁有助于构建关于其容易磁分离和电化学活性的PB的多功能吸附/鼓声平台。在该纳米型稳定性上实现了对Pb（Ⅱ）的同时选择性吸附和现场监测，而不是明显的基质效应，因此达到了令人满意的稳定性和敏感性。

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  • 来源
    《Environmental Science & Technology》 |2021年第6期|3967-3975|共9页
  • 作者

    Li Yu; Yuchan Li; Yuefei Ruan;

  • 作者单位

    Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of Education Institute of Environmental Research at Greater Bay Guangzhou University Guangzhou 510006 People's Republic of China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 People's Republic of China;

    Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of Education Institute of Environmental Research at Greater Bay Guangzhou University Guangzhou 510006 People's Republic of China;

    State Key Laboratory of Marine Pollution Department of Chemistry City University of Hong Kong Kowloon Hong Kong SAR People's Republic of 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    heavy metal; selectivity; electrosensing; manganese oxide; adsorptive site;

    机译：重金属;选择性;冷敏;锰氧化物;吸附遗址;

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