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首页> 外文期刊>Chemistry: A European journal >Synthesis and characterization of nanostructured Fe _3O _4 micron-spheres and their application in removing toxic cr ions from polluted water
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Synthesis and characterization of nanostructured Fe _3O _4 micron-spheres and their application in removing toxic cr ions from polluted water

机译：纳米Fe _3O _4纳米球的合成，表征及其在去除水中有毒Cr离子中的应用

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摘要

We present a simple and effective method for the synthesis of nanostructured Fe _3O _4 micron-spheres (NFMSs) by annealing hydrothermally formed FeCO _3 spheres in argon. The phase structure, particle size, and magnetic properties of the product have been characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and by means of a superconducting quantum interference device (SQUID). The results have shown that the as-obtained NFMSs have a diameter of about 5 μm and are composed of nanometer-sized porous lamellae. The NFMSs have a large specific surface area (135.9 m ~2 g ~(-1)), reductive Fe ~(2+) incorporated into their structure, and intense magnetic properties. These properties suggest that NFMSs have potential application in removing toxic Cr ~(6+) ions from polluted water. At 25°C, each gram of NFMSs product can remove 43.48 mg of Cr ~(6+) ions, as compared to just 10.2 mg for nanometer-sized Fe _3O _4 and 1.89 mg for micron-sized Fe _3O _4. The enhanced removal performance can be ascribed to the structural features. Moreover, the Cr ~(6+) ion removal capacity of the NFMSs can reach up to 71.2 mg g ~(-1) at 50°C. The influencing parameters in the removal of Cr ~(6+) ions, such as contact time, pH, and temperature, have been evaluated. The Cr ~(6+)-removal mechanism has been investigated. We have found that the NFMSs product not only serves as an effective adsorbent to remove toxic Cr ~(6+) ions from polluted water, but also as an effective reductant in reducing the adsorbed toxic Cr 6+ ions to much less toxic Cr ~(3+) through the Fe ~(2+) incorporated into its structure.
机译：我们提出了一种简单有效的方法，通过在氩气中对水热形成的FeCO _3球进行退火，来合成纳米结构的Fe _3O _4微米球（NFMS）。已通过X射线衍射（XRD），傅立叶变换红外光谱（FTIR），X射线光电子能谱（XPS），场发射扫描电子显微镜（ FESEM），透射电子显微镜（TEM）以及借助于超导量子干涉仪（SQUID）。结果表明，所获得的NFMS具有约5μm的直径，并且由纳米尺寸的多孔薄片组成。 NFMS具有较大的比表面积（135.9 m〜2 g〜（-1）），还原的Fe〜（2+）并入其结构并具有很强的磁性。这些特性表明，NFMS在去除污水中的有毒Cr〜（6+）离子方面具有潜在的应用前景。在25°C下，每克NFMS产品可去除43.48 mg Cr〜（6+）离子，而纳米级Fe _3O _4仅需10.2 mg，微米级Fe _3O _4仅需1.89 mg。增强的去除性能可以归因于结构特征。此外，NFMS的Cr〜（6+）离子去除能力在50°C时可达到71.2 mg g〜（-1）。已经评估了去除Cr〜（6+）离子的影响参数，例如接触时间，pH和温度。研究了Cr〜（6+）的去除机理。我们已经发现，NFMSs产品不仅可以作为有效的吸附剂从污水中去除有毒的Cr〜（6+）离子，而且还可以作为有效的还原剂将吸附的有毒的Cr 6+离子还原为毒性更低的Cr〜（ 3+）通过Fe〜（2+）并入其结构中。

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