Preparation of modified MFI (ZSM-5 and silicalite-1) zeolites for potassium extraction from seawater--颗粒学报PARTICUOLOGY

Ling, R., Chen, W., & Hou, J. (2018). Preparation of modified MFI (ZSM-5 and silicalite-1) zeolites for potassium extraction from seawater. Particuology, 36, 190-192. https://doi.org/10.1016/j.partic.2017.04.003

Preparation of modified MFI (ZSM-5 and silicalite-1) zeolites for potassium extraction from seawater

Rongjie Ling, Wu Chen, Jin Hou ^*

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

10.1016/j.partic.2017.04.003

Volume 36, February 2018, Pages 190-192

Received 21 June 2016, Revised 11 April 2017, Accepted 23 April 2017, Available online 18 July 2017, Version of Record 22 December 2017.

E-mail: houjinqd@ouc.edu.cn

Highlights

• Nanosized ZSM-5 and silicalite-1 zeolites were prepared using hydrothermal method.

• K⁺ ion-exchange capacity of synthesized ZSM-5 and silicalite-1 in seawater was 56.7 and 48.7 mg/g.

• The synthesized zeolites have the ability for potassium extraction from seawater.

Abstract

Modified nanosized MFI (ZSM-5 and silicalite-1) zeolites were successfully synthesized by a hydrothermal method using aluminum isopropoxide and tetraethylorthosilicate as the raw materials. The synthetic zeolites were characterized by X-ray diffraction, energy dispersion spectroscopy, and scanning electron microscopy. The ZSM-5 and silicalite-1 zeolites exhibited ellipse-like and cubic columns, respectively. The K⁺ ion-exchange equilibrium and ion-exchange capacity of the synthetic zeolites in seawater were investigated. The K⁺ ion-exchange of synthetic zeolites was rapid and reached an ion-exchange balance in approximately 20 min. The K⁺ ion-exchange capacity of ZSM-5 and silicalite-1 in seawater was 56.7 and 48.7 mg/g, respectively. The synthetic zeolites have high selectivity toward K⁺, and therefore, they can be used to selectively extract potassium from seawater.

Graphical abstract

Keywords

MFI; ZSM-5; Silicalite-1; Ion-exchange; Potassium; Seawater

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