Abstract
Polymer inclusion membrane (PIM) has been progressively utilised in various chemical engineering applications. Understanding the interfacial interactions between PIM surface and surrounding solutions is significantly important for the industrial application of PIM systems. In this work, interfacial behavior of the PIM was studied during Zn(II) extraction process. The real-time change of the PIM under various environmental conditions was monitored by Quartz crystal microbalance with dissipation monitoring. Water penetration into the PIM layer was demonstrated when the PIM was in contact with Milli-Q water. Atomic force microscopy imaging confirmed that the swollen PIM had a looser network and rougher surface, as compared to its original state. When switching the surrounding environment to ZnSO4 solution, higher Zn(II) concentration could induce microstructure change and more significant membrane swelling in the PIM layer. Our results provide valuable implications for the design of effective PIM systems towards practical applications in wastewater treatment and hydrometallurgy.
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