Preparation of nano Fe/SiO<sub>2</sub> core-shell composite particles from copper/iron ore cinder and their microwave absorption properties

ZOU Zheng; XUAN Aiguo; WU Yuanxin; HE Jun; HE Jia

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Preparation of nano Fe/SiO₂ core-shell composite particles from copper/iron ore cinder and their microwave absorption properties

更新时间：2025-12-10

- Preparation of nano Fe/SiO₂ core-shell composite particles from copper/iron ore cinder and their microwave absorption properties
- CIESC Journal Issue 5, Pages: 1322-1326(2009)
- 作者机构：
  
  1. 武汉工程大学化工与制药学院
  2. 绿色化工过程省部共建教育部重点实验室
  3. 湖北祥云集团股份有限公司
- 作者简介：
- 基金信息：
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- Online First：05 May 2009，
  
  Published：05 May 2009
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ZOU Zheng, XUAN Aiguo, WU Yuanxin, et al. Preparation of nano Fe/SiO₂ core-shell composite particles from copper/iron ore cinder and their microwave absorption properties[J]. CIESC Journal, 2009, (5): 1322-1326.
DOI：

ZOU Zheng, XUAN Aiguo, WU Yuanxin, et al. Preparation of nano Fe/SiO₂ core-shell composite particles from copper/iron ore cinder and their microwave absorption properties[J]. CIESC Journal, 2009, (5): 1322-1326. DOI：

摘要

以铜铁尾矿制酸烧渣为原料，经熟化、酸浸、还原和净化等步骤制备亚铁离子；在乙醇-水液相体系中，以NaBH4作为还原剂，反应生成纳米Fe粒子；最后通过正硅酸四已酯（TEOS）水解包覆制得纳米Fe/SiO2核壳复合粒子。产物分别采用XRD、TEM、IR等手段进行表征。进一步地，使用矢量网络分析仪在2.0 ~ 18.0 GHz波段内来研究样品的吸波性能。结果表明，IR光谱上在1389 cm-1和878 cm-1分别出现对应于四配位Si—O键和Si—O—Fe键的特征吸收峰，说明在Fe粒子表面包覆有SiO2。通过测试计算得知，当吸波样品厚度为4.5 mm时，其微波吸收性能在17.2 GHz处达到最小值-39.0 dB。由此可见，以铜铁尾矿制酸烧渣为原料，可制得吸波性能优良的纳米Fe/SiO2核壳复合粒子微波吸收材料。

Abstract

With the copper/iron cinder as the starting material

ferrous ions were obtained through maturing

acid leaching

reducing and purifying processes

and then iron nanoparticles were prepared by reacting with sodium borohydride in the system of ethanol-water.The nano Fe/SiO2 core-shell composite particles were synthesized by the hydrolysis of tetraethyl orthosilicate (TEOS).The products were characterized by X-ray diffraction (XRD)

transmission electron microscope (TEM) and reflectance absorption infrared spectroscopy (RA-IR).The particles were randomly dispersed in paraffin at a mass ratio of 5.5∶4.5 for microwave electromagnetic parameters detection in the frequency range of 2.0—18.0 GHz by vector network analyzer.The results showed that there were two characteristic absorption peaks of Si—O and Si—O—Fe bond appearing at 1389 cm-1 and 878 cm-1

which indicated that the nano iron was successfully coated by SiO2.Through measuring and calculation

the minimal reflection loss was -39.0 dB at 17.2 GHz when the sample thickness was 4.5 mm.So nano Fe/SiO2 core-shell composite particles can be prepared from copper/iron cider to be used as an effective microwave absorbing material.

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Preparation of nano Fe/SiO2 core-shell composite particles from copper/iron ore cinder and their microwave absorption properties

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Preparation of nano Fe/SiO₂ core-shell composite particles from copper/iron ore cinder and their microwave absorption properties