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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Mechanisms of Synergistic Removal of Low Concentration As(V) by nZVI@Mg(OH)(2) Nanocomposite
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Mechanisms of Synergistic Removal of Low Concentration As(V) by nZVI@Mg(OH)(2) Nanocomposite

机译：通过NZVI @ Mg（OH）（2）纳米复合材料协同除去低浓度为（v）的机制

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摘要

In this work, by using Mg(OH)(2) nanoplatelets as support material for nanoscale zerovalent iron (nZVI), riZVI@ Mg(OH)(2) composite was prepared and found to have super high adsorption ability toward As(V) at environmentally relevant concentrations. It was revealed that the variation of corrosion products of nZVI in the presence of Mg(OH)(2) and Mg2+ is an important factor for increase in the adsorption ability toward As(V). X-ray diffraction (XRD) analysis indicated that the weakly basic condition induced by Mg(OH)(2) decreases the lepidocrocite (gamma-FeOOH) and increases the magnetite/maghemite (Fe3O4/gamma-Fe2O3) content in the corrosion products of nZVI, and the latter has better adsorption affinity to As(V). Moreover, extended X-ray absorption fine structure spectroscopy (EXAFS) indicated that the coordination between arsenic and iron minerals is influenced by dissolved Mg2+, leading to probable formation of magnesium ferrite (MgFe2O4) which has considerable adsorption affinity to As(V). This work provides an important reference not only for the design of pollution control materials but also for understanding arsenic immobilization in natural environments with ubiquitous Mg2+ ion.
机译：在这项工作中，通过使用Mg（OH）（2）纳米孔作为纳米级Zeropalent铁（NZVI）的载体材料，制备Rizvi @ Mg（OH）（2）复合材料并发现朝向（V）具有超高吸附能力在环境相关的浓度。据透露，在Mg（OH）（2）（2）和Mg2 +存在下，NZVI的腐蚀产物的变化是朝向（v）的吸附能力增加的重要因素。 X射线衍射（XRD）分析表明，Mg（OH）（2）诱导的弱碱性条件降低了尿道膜（γ-FeOH），并在腐蚀产物中增加磁铁矿/磁石（Fe3O4 / Gamma-Fe2O3）含量NZVI，后者具有更好的吸附亲和力，如（v）。此外，延长的X射线吸收细结构光谱（EXAF）表明砷和铁矿物质之间的配位受溶解的Mg2 +影响，导致镁铁氧体（MgFe2O4）的可能形成，其具有相当大的吸附亲和力至As（v）。这项工作不仅为污染控制材料的设计提供了重要的参考，而且还为理解具有普遍存气的Mg2 +离子的自然环境中的砷固定化。

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    Wu Can; Liu Weizhen; Zhang Jing; Chu Shengqi; Shi Zhenqing; Dang Zhi; Lin Zhang;

  • 作者单位

    South China Univ Technol Sch Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

    South China Univ Technol Sch Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

    Chinese Acad Sci Inst High Energy Phys Beijing Synchrotron Radiat Facil Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst High Energy Phys Beijing Synchrotron Radiat Facil Beijing 100049 Peoples R China;

    South China Univ Technol Sch Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

    South China Univ Technol Sch Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

    South China Univ Technol Sch Environm &

    Energy Guangzhou 510006 Guangdong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
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