Effects of ion Exchange on Permeation Properties through FAU Zeolite Membranes

抄録

This study investigates the effects of ion exchange with alkaline earth metals (Mg, Ca, Sr, Ba) on the performance of faujasite (FAU) zeolite membranes for water/isopropyl alcohol (IPA) pervaporation. FAU zeolite powders and membranes were synthesized and modified through ion exchange. The structural changes were analyzed using XRD, N2 adsorption-desorption, zeta potential measurements, and energy dispersive Xray spectroscopy (EDS). Ion exchange significantly impacted the crystallinity, surface charge, and pore properties of the FAU zeolites. The increase in ionic radius of divalent ions increased the water separation factor in PV permeation of IPA solutions from 7.474 to 4590. The ion exchange increased the d-value of the [111] plane of the FAU crystal, which is due to the suppression of permeation through the grain boundaries of the FAU membrane. The results provide insights into how ion exchange modifications affect the separation performance of FAU zeolite membranes for water/IPA pervaporation.