Rational construction of Co-loaded ceramic composites by recycling gangue for microwave absorption
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Abstract: In the context of sustainable development, tackling the severe solid wastes pollution has become extremely urgent. Herein, the solid waste gangue was successfully recycled to synthesize the ceramic based composite microwave absorbing materials decorated with Co particles through a novel synthesis method. The magnetic Co particles were uniformly loaded in the ceramic matrix by the pelletizing process with gangue and Co2+ following by the in situ carbothermal reaction, and the Co content in ceramic composites can be precisely controlled by adjusting the Co2+ concentration. Furthermore, compared with gangue, the obtained composites displayed optimized performance, the minimum reflection loss value reached −48.2 dB and the effective absorbing band was measured to be 4.3 GHz with the coating thickness of 1.5 mm, which is mainly attributed to the enhanced magnetic loss and multiple interface polarization. Such innovative design of recycling gangue in this work can effectively realize the resource utilization of gangue, which is also beneficial for the low-cost and light-weight of microwave absorbing materials as well.
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Key words:
- gangue /
- comprehensive utilization /
- interface polarization /
- microwave absorbing
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Figure 3. SEM images of Gangue (a), CoG700-1.25M (b), CoG700-1.50M (c), CoG700-1.75M (d).
Figure 6. Complex permittivity real part (a) and imaginary part (b) for Gangue, CoG700-1.25M, CoG700-1.50M and CoG700-1.75M in the testing frequency.
Figure 5. Microwave RL curves of Gangue (a), CoG700-1.25M (b), CoG700-1.50M (c), CoG700-1.75M (d) with different coating thickness.
Figure 7. Complex permeability real part (a) and imaginary part (b), the values of µ"(µ')–2f–1 versus frequency (c), Attenuation constant (d) for Gangue, CoG700-1.25M, CoG700-1.50M and CoG700-1.75M.
Table 1. Microwave absorption performance of some reported absorbent systems.
Absorbent
systemsRLmin
(dB)Matching
frequency
(GHz)EAB
(GHz)Coating
thickness
(mm)Ref. Co@C-700 −17.0 14.1 2.7 2.6 27 Ni0.8Co0.2@C −27.0 5.7 3.5 5.0 28 Ce1.2MM0.8Co17 −32.0 7.4 2.4 1.8 29 Co/NGN −38.5 11.5 3.6 2.5 30 C/Co-600 −40.0 8.4 4.0 2.8 31 Co/C@V2O3 −40.1 15.2 4.6 1.5 19 CoNi@(CoO-NiO) −24.5 17.8 3.0 1.7 32 CoCB800 −20.6 16.1 3.8 1.3 33 CoG700 −35.2 16.2 4.3 1.5 This work 
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