红辉沸石两步水热制备高品质X型分子筛及其高效吸附Cd<sup>2+</sup>、Ni<sup>2+</sup>性能研究

doi:10.11896/cldb.22050310

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Abstract In this study, high quality zeolite X was conversed from stellerite zeolite by a two-step hydrothermal method. The influence of n(H₂O/SiO₂), n(Na₂O/SiO₂), n(Al₂O₃/SiO₂), aging time, crystallization temperature and crystallization time of the stellerite zeolite conversion into zeolite X were investigated, and the adsorption performance for Cd²⁺ and Ni²⁺ of zeolite X was investigated. The results showed that the optimal conversion conditions of zeolite X were as follows:n(H₂O/SiO₂)=55, n(Na₂O/SiO₂)=1.1, n(Al₂O₃/SiO₂)=0.33, aging time 48 h, crystallization temperature 82 ℃ and crystallization time 4 h. After dissolution, the stellerite zeolite depolymerized into the oligomeric Si species and remained in the system to participate in the growth of zeolite X, prompting the relative crystallinity and n(Si/Al) value of the synthesized zeolite X were 100% and 1.14, respectively. It was beneficial to shorten the crystallization time and reduce the crystallization temperature. And the adsorption capacity of Cd²⁺ and Ni²⁺ for zeolite X were 173.553 mg/g and 75.897 mg/g, respectively. Therefore, this study would provide theoretical basis and technical support for the rapid conversion of natural minerals into high quality zeolite X design and preparation.

Key words： stellerite zeolite zeolite X two-step hydrothermal method adsorption performance Cd²⁺ Ni²⁺

Published: Online: 2023-12-19

CLC number:

TB382

Fund:National Natural Science Foundation of China (41662005, 51564008).

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	Articles by authors
	PEI Yinchang
	MO Shengpeng
	XIE Qinglin
	CHEN Nanchun

Cite this article:

PEI Yinchang,MO Shengpeng,XIE Qinglin, et al. Two-step Hydrothermal Synthesis of Stellerite Zeolite to High Quality Zeolite X and Its Efficient Adsorption Performance Study for Cd²⁺ and Ni²⁺[J]. Materials Reports, 2023, 37(24): 22050310-9.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.22050310 OR http://www.mater-rep.com/EN/Y2023/V37/I24/22050310

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