Economical preparation of Fe3O4/C/CG and Fe/C/CG composites as microwave absorbents by recycling of coal gangue
Economical preparation of Fe3O4/C/CG and Fe/C/CG composites as microwave absorbents by recycling of coal gangue
复制标题
煤矸石回收经济制备Fe3O4/C/CG和Fe/C/CG复合材料作为微波吸收剂
DOI：
10.1016/j.materresbull.2021.111573
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发表时间：
2022-02
影响因子：
5.4
通讯作者：
Guomin Li
中科院分区：
文献类型：
--
作者：
Yake Wang;Liping Liang;Baoshun Zhu;Yuming Tian;Guomin Li
污染是可持续发展背景下的一个紧迫问题，解决这个问题的办法是对废弃资源进行再利用。本文利用煤矸石，通过简便的方法制备了用于微波吸收的Fe3O4/C/CG和Fe/C/CG复合材料。合成过程包括将淀粉和硝酸铁的前体溶液负载到煤矸石基质上，然后进行原位碳热还原。初始淀粉质量和碳热温度显着影响复合材料的介电和磁性能，进一步影响复合材料的微波吸收性能。对于Fe3O4/C/CG和Fe/C/CG复合材料，最小反射损耗可分别达到-45.1 dB和-27.8 dB。 Fe/C/CG 的最大有效吸收带宽为 4.7 GHz。导电石墨化碳所带来的强微波衰减和阻抗匹配以及基体上高度分散的碳和铁物种的丰富界面，必须解释其优异的性能。
Pollution is a pressing problem in the context of sustainable development, a solution to which is to reutilize waste resources. Herein, coal gangue was recycled to prepare Fe3O4/C/CG and Fe/C/CG composites for microwave absorption via a facile method. The synthesis process involves loading a precursor solution of starch and ferric nitrate onto coal gangue matrix and then conducting the in-situ carbothermal reduction. The initial starch mass and carbothermal temperature significantly affect the dielectric and magnetic properties, further affect microwave absorption performance of the composites. For the Fe3O4/C/CG and Fe/C/CG composite, the minimum reflection loss could reach −45.1 dB and −27.8 dB, respectively. And the maximum effective absorption bandwidth of Fe/C/CG was 4.7 GHz. The strong microwave attenuation and impedance matching, which stemmed from the conductive graphitized carbon, the abundant interfaces of the highly dispersed carbon and iron species on the matrix, must account for the excellent performance.
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