Recent progress in the green synthesis of zeolite membranes

Abstract

Zeolite membranes have attracted much attention due to their regular and uniform pore structure and good thermal stability, and have attracted much attention in application fields such as gas separation and solvent dehydration. The traditional hydrothermal synthesis of zeolite membranes usually requires a large amount of synthesis solution or gel, relies on expensive and potentially dangerous organic structure directing agents (OSDAs), and involves a long crystallization time and high operating pressure. These factors lead to large resource consumption, significant chemical waste, and pose environmental and safety hazards. In recent years, with the growing interest in developing green and sustainable zeolite membrane synthesis routes to overcome these limitations, it has gradually become a research hotspot in this field. This review summarizes and discusses recent advances in the green synthesis of zeolite membranes from several aspects, including reduced quantity of synthesis solutions or gels, OSDA-free synthesis, low-cost and biodegradable OSDA-assisted synthesis, microwave-assisted synthesis, and ionothermal synthesis and outlines future development prospects in this field.