One-Step Hydrothermal Synthesis of Zeolite X Powder from Natural Low-Grade Diatomite

Materials
Guangyuan YaoShuilin Zheng

Abstract

Zeolite X powder was synthesized using natural low-grade diatomite as the main source of Si but only as a partial source of Al via a simple and green hydrothermal method. The microstructure and surface properties of the obtained samples were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), wavelength dispersive X-ray fluorescence (XRF), calcium ion exchange capacity (CEC), thermogravimetric-differential thermal (TG-DTA) analysis, and N₂ adsorption-desorption technique. The influence of various synthesis factors, including aging time and temperature, crystallization time and temperature, Na₂O/SiO₂ and H₂O/Na₂O ratio on the CEC of zeolite, were systematically investigated. The as-synthesized zeolite X with binary meso-microporous structure possessed remarkable thermal stability, high calcium ion exchange capacity of 248 mg/g and large surface area of 453 m²/g. In addition, the calcium ion exchange capacity of zeolite X was found to be mainly determined by the crystallization degree. In conclusion, the synthesized zeolite X using diatomite as a cost-effective raw material in this study has great potential for industrial application such as catalyst support and adsorbent.

References

Nov 8, 2005·Journal of Hazardous Materials·Takaaki WajimaJohn F Rakovan
Oct 14, 2008·Journal of Colloid and Interface Science·Xiaoying JinZuliang Chen
May 10, 2015·Journal of Hazardous Materials·Vikranth Volli, M K Purkait

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Citations

Nov 30, 2018·Environmental Science and Pollution Research International·Guangyuan YaoSridhar Komarneni
Feb 27, 2020·Scientific Reports·Santheraleka RamanathanThangavel Lakshmipriya
Oct 22, 2020·Materials·Claudia BelvisoFrancesco Cavalcante

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