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首页> 外文期刊>RSC Advances >Highly organized nanofiber formation from zero valent iron nanoparticles after cadmium water remediation
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Highly organized nanofiber formation from zero valent iron nanoparticles after cadmium water remediation

机译：镉水修复后由零价铁纳米颗粒形成的高度有序的纳米纤维

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' Many studies have used nanoscale zero valent iron (nZVI) nanoparticles to remove redox-sensitive metals (e. g., As, Cr, U, Se, Ni, Cu) from aqueous systems by absorption or reduction processes. However, very few investigations present a detailed study of the product formed after the remediation process. In order to quantify the efficiency of nZVI particles as a possible cadmium remediation agent, we prepared nZVI by sodium borohydride reduction of an iron complex, FeCl3 center dot 6H(2)O, at room temperature and ambient pressure. Fe-0 and nanocrystalline structures of iron oxides and oxyhydroxides were obtained with this method. We exposed the nZVI to 6 ppm of Cd2+ and characterized the products with X-ray diffraction, X-ray absorption and X-ray photoelectron spectroscopy. Inductively coupled plasma analysis showed that the nZVI remediation efficiency of cadmium ions was between 80% and 90% in aqueous media. All of the physical characterization results confirmed the presence of Fe-0, a-Fe2O3 and FeOOH. High resolution transmission electron microscopy images showed nanofiber formation of a mixture of Fe-0, oxyhydroxides and oxides iron formed after interacting with cadmium ions, possibly forming CdFe2O4. These results suggest that the FeOOH shell and other iron oxides in nZVI could enhance Cd2+ removal. This removal is observed to cause a change of the initial structure of nZVI to nanofibers due to possible formation of CdFe2O4 as a waste product.
机译：许多研究已经使用纳米级零价铁（nZVI）纳米颗粒通过吸收或还原过程从水性体系中去除了对氧化还原敏感的金属（例如，As，Cr，U，Se，Ni，Cu）。但是，很少有研究对修复过程后形成的产品进行详细研究。为了量化nZVI颗粒作为可能的镉修复剂的效率，我们在室温和环境压力下通过硼氢化钠还原铁配合物FeCl3中心点6H（2）O制备了nZVI。用这种方法获得了Fe-0和铁氧化物和羟基氧化物的纳米晶体结构。我们将nZVI暴露于6 ppm的Cd2 +中，并通过X射线衍射，X射线吸收和X射线光电子能谱对产品进行了表征。电感耦合等离子体分析表明，水介质中镉离子的nZVI修复效率在80％至90％之间。所有的物理表征结果证实了Fe-0，α-Fe2O3和FeOOH的存在。高分辨率透射电子显微镜图像显示，Fe-0，羟基氧化物和氧化物铁与镉离子相互作用后形成的纳米纤维形成物，可能形成CdFe2O4。这些结果表明，nZVI中的FeOOH壳和其他铁氧化物可以提高Cd2 +的去除率。由于可能形成CdFe2O4作为废品，因此观察到这种去除会导致nZVI的初始结构变为纳米纤维。

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