Issue 27, 2025, Issue in Progress

Sustainable and resource-efficient synthesis of zeolite membranes in a fluoride-free, organic template-free dilute solution

Abstract

Environmentally friendly and sustainable synthesis technologies hold considerable significance in the manufacturing of high-performance mordenite membranes. Herein, a high-performance mordenite membrane was successfully fabricated on a macroporous tube under fluoride-free and organic template-free conditions, using a highly diluted synthesis solution with a molar composition of H2O/SiO2 = 250. This approach eliminated the necessity of fluoride and template agents while reducing chemical usage via a highly diluted solution. The effects of the presence of seed layers and corresponding coating methods and crystallization temperature and time on membrane formation and isopropanol/water separation performance were systematically investigated. Results indicated that high-quality membrane formation was facilitated by a seed layer prepared via variable-temperature hot dip-coating on macroporous tubes. Under optimized preparation parameters, the resulting mordenite membrane achieved a permeation flux of 3.24 kg m−2 h−1 and a separation factor exceeding 10 000 in separation of isopropanol dehydration. These findings collectively demonstrate the potential of this fluoride-free, template-free, and diluted-solution approach for producing high-performance mordenite membranes boasting significant environmental and economic advantages.

Graphical abstract: Sustainable and resource-efficient synthesis of zeolite membranes in a fluoride-free, organic template-free dilute solution

Article information

Article type
Paper
Submitted
23 May 2025
Accepted
23 Jun 2025
First published
26 Jun 2025
This article is Open Access
Creative Commons BY license

RSC Adv., 2025,15, 21859-21871

Sustainable and resource-efficient synthesis of zeolite membranes in a fluoride-free, organic template-free dilute solution

L. Li, J. Li, Y. Li, X. Wu, L. Li, W. Zeng, Y. Chen and J. Choi, RSC Adv., 2025, 15, 21859 DOI: 10.1039/D5RA03631C

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