Synthesis of magnetic core–shell iron nanochains for potential applications in Cr(VI) ion pollution treatment

Abstract

Fe nanochains with diameters of 50–150 nm and average length of about 1 μm were synthesized by titrating NaBH4 solution into FeCl2 aqueous solution (i.e., reduction of Fe(II) ions). The microstructures and magnetic properties were studied by X-ray diffraction (XRD), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM). The results reveal that the nanochains have a core–shell structure with α-Fe as the core and amorphous iron oxide as the shell. The Fe core–shell nanochains show the characteristic of soft magnetic materials, achieving the highest magnetization of 200.74 mA·m2·g−1. The influences of the titrating rate of NaBH4 aqueous solution on the morphology of the Fe nanochains were also studied. It reveals that low titrating rate is beneficial for synthesizing Fe nanochains with uniform morphology. The reduction experiments indicate that these Fe nanochains are of high reducibility. About 90 % Cr(VI) ions are successfully removed after 10 min reaction of 100 mg Fe nanochains in the 100 ml K2Cr2O7 solution (100 mg·L−1) and more than 99 % after 30 min.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51201004), the Research Fund for the Doctoral Program of Higher Education of China (No. 20121102120002), and the Fundamental Research Funds for the Central Universities (No. YWF-13-ZY–045).

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Correspondence to You-Xing Yu.

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Feng, HF., Yu, YX., Jiang, SQ. et al. Synthesis of magnetic core–shell iron nanochains for potential applications in Cr(VI) ion pollution treatment. Rare Met. 40, 1–4 (2021). https://doi.org/10.1007/s12598-014-0408-y

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Keywords

  • Fe nanochains
  • Core–shell structure
  • Magnetic properties
  • Reduction of Cr(VI) ion