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首页> 外文期刊>Environmental Science & Technology >Synthesis of Highly Reactive Subnano-Sized Zero-Valent Iron Using Smectite Clay Templates
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Synthesis of Highly Reactive Subnano-Sized Zero-Valent Iron Using Smectite Clay Templates

机译：利用蒙脱石粘土模板合成高反应性亚纳米零价铁

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摘要

A novel method was developed for synthesizing subnano-sized zero-valent iron (ZVI) using smectite clay layers astemplates. Exchangeable Fe(III) cations compensating the structural negative charges of smectites were reduced with NaBH_4, resulting in the formation of ZVI. The unique structure of smectite clay, in which isolated exchangeable Fe(III) cations reside near the sites of structural negative charges, inhibited the agglomeration of ZVI resulting in the formation of subnanoscale ZVI particles in the smectite interlayer regions. X-ray diffraction revealed an interlayer spacing of ～5 A. The non-structural iron content of this clay yields a calculated ratio of two atoms of ZVI per three cation exchange sites, in full agreement with the X-ray diffraction (XRD) results since the diameter of elemental Fe is 2.5 A. The clay-templated ZVI showed superior reactivity and efficiency compared to other previously reported forms of ZVI as indicated by the reduction of nitrobenzene; structural Fe within the aluminosilicate layers was nonreactive. At a 1:3molar ratio of nitrobenzeneon-structural Fe, a reaction efficiency of 83% was achieved, and over 80% of the nitrobenzene was reduced within one minute. These results confirm that non-structural Fe from Fe(III)-smectite was reduced predominantly to ZVI which was responsible for the reduction of nitrobenzene to aniline. This new form of subnanoscale ZVI may find utility in the development of remediation technologies for persistent environmental contaminants, for example, as components of constructed reactive domains such as reactive caps for contaminated sediments.
机译：开发了一种新方法，以蒙脱石粘土层为模板合成亚纳米尺寸的零价铁（ZVI）。 NaBH_4还原了补偿蒙脱石结构负电荷的可交换Fe（III）阳离子，从而形成ZVI。蒙脱石粘土的独特结构（其中孤立的可交换Fe（III）阳离子位于结构负电荷的位置附近）抑制了ZVI的团聚，从而导致在蒙脱石夹层区域形成亚纳米级ZVI颗粒。 X射线衍射显示层间间距约为5A。该粘土的非结构性铁含量可得出每个三个阳离子交换位点ZVI的两个原子的计算比率，与X射线衍射（XRD）结果完全一致由于元素铁的直径为2.5A。与硝基苯还原后的结果相比，粘土模板ZVI与以前报道的其他ZVI相比，具有更高的反应活性和效率。铝硅酸盐层中的结构铁是非反应性的。在硝基苯/非结构化铁的摩尔比为1：3时，反应效率达到83％，并且在一分钟内还原了80％以上的硝基苯。这些结果证实，来自Fe（III）-蒙脱石的非结构化Fe主要还原为ZVI，这导致硝基苯还原为苯胺。亚纳米级ZVI的这种新形式可用于开发持久性环境污染物的修复技术，例如，作为已构建的反应域的组成部分，例如被污染沉积物的反应帽。

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  • 来源
    《Environmental Science & Technology》 |2010年第11期|P.4258-4263|共6页
  • 作者

    CHENG GU; HANZHONG JIA; HUI LI; BRIAN J. TEPPEN; STEPHEN A. BOYD;

  • 作者单位

    Department of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824;

    rnDepartment of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824;

    rnDepartment of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824;

    rnDepartment of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824;

    rnDepartment of Crop and Soil Sciences, Michigan State University, East Lansing, Michigan 48824;

  • 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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