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Open AccessArticle

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

School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Authors to whom correspondence should be addressed.
Materials 2018, 11(6), 906;
Received: 15 May 2018 / Revised: 25 May 2018 / Accepted: 25 May 2018 / Published: 28 May 2018
(This article belongs to the Special Issue Porous Materials for Environmental Applications)
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. View Full-Text
Keywords: diatomite; zeolite X; hydrothermal method; calcium ion exchange capacity diatomite; zeolite X; hydrothermal method; calcium ion exchange capacity
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MDPI and ACS Style

Yao, G.; Lei, J.; Zhang, X.; Sun, Z.; Zheng, S. One-Step Hydrothermal Synthesis of Zeolite X Powder from Natural Low-Grade Diatomite. Materials 2018, 11, 906.

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