Abstract
Zeolite X is a potential electromagnetic wave (EMW) absorption material owning to its advantages of good dielectric properties, light weight and large specific surface area. Herein, high-purity zeolite X was prepared from fly ash using a green synthesis approach, in which only trace water was used and achieved zero discharge of waste water. Physiochemical properties of fabricated zeolite X were comprehensively evaluated through XRD, PSD, SEM, TG-DSC and BET test. XRD pattern shows the successful preparation of zeolite X with good crystallinity and high purity, and the average particle size is ~ 2.45 μm, which conforms to Gaussian distributions. The fabricated zeolite X exhibits typical octahedral structure and good thermal stability. It is noteworthy that the specific surface area is up to 473.56 m2/g, representing porous structure, which is beneficial to EMW attenuation. What’s more, the abundant crystal water and adsorbed water existing in the sample is conductive to dipole polarization, which further consume EMW energy. The effective absorption bandwidth (EAB) of the synthesized zeolite X is 2.08 GHz (13.36–15.44 GHz) at the thickness of 2.5 mm. This study provides an eco-friendly approach to change waste into valuables, and moreover the synthesized zeolite X is a potential EMW absorbing material.
Highlights
With the wide use of electronic devices, electromagnetic wave (EMW) pollution is becoming more and more serious, and EMW absorbing materials have attracted wide attention [1,2]
This study provides an eco-friendly approach to change waste into valuables, and the synthesized zeolite X is a potential EMW absorbing material
The synthesis process was conducted in the following steps: Firstly, fly ash was homogeneously mixed with sodium hydroxide and the mixture was calcined in muffle furnace at 750°C for 2h
Summary
With the wide use of electronic devices, electromagnetic wave (EMW) pollution is becoming more and more serious, and EMW absorbing materials have attracted wide attention [1,2]. As a kind of low-cost material, natural and synthetic zeolites have great application potential in EMW adsorption field owning to the advantages of unique dielectric properties, low density, high specific surface, and strong mechanical and chemical stability. What’s more, the large surface area of sepiolite is convenient for multiple reflections and scattering, which can increase the propagation path of incident EMW and promote EMW dissipation. As another kind of porous mineral material, the research of zeolite/zeolite-based materials as islanding or regional dielectric loss absorbers is of great significance in the research field of new EMW absorbing materials, while the relevant reports are still rare. The work supplied a green and low-cost method to prepare zeolite X, which was expected to be an EMW absorbing material
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