Recycling and utilization of coal gasification residues for fabricating Fe/C composites as novel microwave absorbents

Li, Guomin; Xue, Xiaojie; Mao, Lutao; Wang, Yake; Li, Lingxiao; Wang, Guizhen; Zhang, Kewei; Zhang, Rong; Wang, Yuexiang; Liang, Liping

doi:10.1007/s12613-022-2534-0

Cited by 7 publications

(6 citation statements)

References 58 publications

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“…89-0951), respectively. However, all peak intensities of Fe 2 O 3 weakened, and the phenomenon of phase transformation of the Fe species started to appear, which is probably due to the partial reduction of Fe 2 O 3 to Fe 3 O 4 in the temperature range of 500–600 °C. , When the thermal reduction temperature is up to 700 °C, the featured diffraction peaks of Fe 2 O 3 almost vanish completely, while the diffraction peaks of Fe 3 O 4 become sharper, further indicating that the carbothermal reduction reaction is proceeding fiercely, and better crystallinity of Fe 3 O 4 can be obtained at this temperature. Afterward, the temperature further increases to 800–900 °C, and new characteristic peaks at ∼21.2, ∼23.2, ∼27.3, and ∼29.7° appear, which are assigned to the (002), (201), (210), and (202) lattice planes of NaAlSiO 4 (JCPDS No.…”

Section: Results and Discussionmentioning

confidence: 99%

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Xue,

Su,

Jia

et al. 2024

ACS Appl. Electron. Mater.

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To achieve the high-value utilization of solid waste red mud and the low-cost preparation of efficient microwave absorbers, we recycled red mud (RM) and coal (C) to economically synthesize Fe x O y /C-based microwave absorbers (named RMCs) via a one-pot method and carbothermal reduction technology. It was found that the magnetic species and carbon crystallinity are sensitive to the carbothermal temperature. Interestingly, the microwave absorption performances of RMC composites display strong inclusiveness to the variable magnetic components with temperature. Benefiting from the suitable magnetic species and graphitization degree of carbon, excellent microwave absorption properties are achieved in the RMC composites. For RMC-700 composites, all of the minimum reflection loss (RL min ) values are less than −30 dB when the coating thickness is above 1.5 mm, and its maximum efficient absorption bandwidth (EAB max ) covers five-sixths of the Ku band (5 GHz). For RMC-900 samples with a coating thickness of 1.5 mm, the RL min value could reach −25 dB with a corresponding EAB of 4.16 GHz. An RL min value of −34.6 dB and an EAB max of 4.08 GHz are also obtained in RMC-1000 composites. The above excellent properties are mainly benefited by the strong dielectric loss, which is derived from Fe and its oxide particles as well as graphitized carbon. Moreover, multiple interface polarization and dipole polarization loss provide a guarantee for the powerful attenuation capability of the RMC composite. Impedance matching is also effectively regulated by the changeable magnetic constituents. More importantly, this work provides a direction for the application of recycled red mud, further reducing the environmental pollution caused by its stacking, and is expected to make certain contributions toward protection against electromagnetic radiation.

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Section: Results and Discussionmentioning

confidence: 99%

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Xue,

Su,

Jia

et al. 2024

ACS Appl. Electron. Mater.

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“…In this series of loss mechanism, the impedance matching and attenuation ability of the material work in concert, effectively improved the EM-wave absorption performance of the material. 56,57 Simulations were performed using a composite model of PEC and Cu 9 S 5 nanomaterials, the RCS values of which can effectively evaluate the attenuation capability of the composite model of three different-shaped Cu 9 S 5 nanomaterials for EM waves under far-field conditions. 58,59 The model comprises an upper absorber layer of the composite (thickness = 1.78 mm) and a lower PEC layer (thickness = 1 mm).…”

Section: Resultsmentioning

confidence: 99%

“…The existence of different valence states of Cu in Cu 9 S 5 can lead to uneven charge distribution and transfer of positive and negative charge centers and generate polarization behavior. , Finally, the lattice defects inside the material under the action of an EM field caused electron deficiency and dipole polarization. In this series of loss mechanism, the impedance matching and attenuation ability of the material work in concert, effectively improved the EM-wave absorption performance of the material. , …”

Section: Resultsmentioning

confidence: 99%

Self-Stacked Growth of Cu₉S₅ Nanostructures with Morphology Regulation as an Electromagnetic Wave Absorber

Chen,

Xing

2023

ACS Appl. Nano Mater.

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The development of thin semiconductor nanomaterial sulfide absorbers with strong absorption and a wide bandwidth can effectively expand the application of sulfide in the field of electromagnetic wave absorption. Structural analysis of the crystallographic information, epitaxial elemental information, microscopic morphological structure information, electromagnetic wave parameter information, and radar scattering cross-sectional area characteristics of Cu 9 S 5 demonstrated that the morphological regulation strategy applied to Cu 9 S 5 nanomaterials achieved the expected results. The crystalline shape of the nanomaterial was pure. The prepared Cu 9 S 5 nanomaterial had multiple electromagnetic wave loss mechanisms. Among them, the minimum reflection loss of the polyhedral Cu 9 S 5 nanomaterial was −60.77 dB at 1.78 mm, and the effective absorption bandwidth of the porous sheet Cu 9 S 5 nanomaterial reached 5.2 GHz at 1.9 mm. This work provided a strategy for the application of semiconductor Cu 9 S 5 functional nanomaterials in the field of electromagnetic wave absorption and can serve as a basis for subsequent in-depth studies on semiconductor metal sulfides. Nanostructured Cu 9 S 5 has excellent research prospects in the field of microwave absorption.

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“…27 The well-bonded core−shell structure and the interconnected contact surfaces between the spheres are conducive to the creation of phase interfaces, and the hollow sphere structure is also conducive to the entry of incident EM waves into the material and their repeated attenuation. 42 The reflection loss (RL) values can be obtained via the following equation 43−45…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…TEM-EDS characterization of VM-2 reveals that the spheres are interconnected, and the hollow VO 2 spheres can be seen through the elemental distribution state, which, combined with the images of VO 2 in the support material, can determine that the spheres are hollow structures and that the material is excellent and well bonded . The well-bonded core–shell structure and the interconnected contact surfaces between the spheres are conducive to the creation of phase interfaces, and the hollow sphere structure is also conducive to the entry of incident EM waves into the material and their repeated attenuation …”

Section: Resultsmentioning

confidence: 99%

Heterojunction MoS₂@VO₂ Microspheres for Electromagnetic Wave Absorption in the X-Band

Gao,

Zhang,

Chen

et al. 2023

ACS Appl. Electron. Mater.

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The development of core–shell structural composites with specific frequency band absorption properties is a means to effectively improve the performance and use of wave absorbers. Herein, core–shell structural MoS2@VO2 composites with semiconductor heterojunctions were designed by a multistep hydrothermal method using an interface engineering strategy. After analysis of the material crystal information, epitaxial element information, microscopic morphology structure information, and electromagnetic wave parameter information, the MoS2@VO2 composite has a good chemical bonding state, and its morphology meets expectations. The prepared MoS2@VO2 composites have various loss pathways for electromagnetic waves. The MoS2@VO2 composite achieves a minimum reflection loss of −56.78 dB, and the absorption band covers the whole X-band. The electromagnetic wave absorption properties of this material were improved by the construction of semiconductor heterojunctions, the introduction of a large number of phase interfaces, and the design of special hollow and core–shell structures. This work can provide a strategy for the application of semiconductor-based composite functional materials in the field of electromagnetic wave absorption.

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Recycling and utilization of coal gasification residues for fabricating Fe/C composites as novel microwave absorbents

Cited by 7 publications

References 58 publications

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Self-Stacked Growth of Cu₉S₅ Nanostructures with Morphology Regulation as an Electromagnetic Wave Absorber

Heterojunction MoS₂@VO₂ Microspheres for Electromagnetic Wave Absorption in the X-Band

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Recycling and utilization of coal gasification residues for fabricating Fe/C composites as novel microwave absorbents

Cited by 7 publications

References 58 publications

Facile Synthesis of FexOy/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Facile Synthesis of FexOy/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Self-Stacked Growth of Cu9S5 Nanostructures with Morphology Regulation as an Electromagnetic Wave Absorber

Heterojunction MoS2@VO2 Microspheres for Electromagnetic Wave Absorption in the X-Band

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Product

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Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Self-Stacked Growth of Cu₉S₅ Nanostructures with Morphology Regulation as an Electromagnetic Wave Absorber

Heterojunction MoS₂@VO₂ Microspheres for Electromagnetic Wave Absorption in the X-Band