Surface energy modification of a Na-mordenite thin layer treated by an alkaline solution
The determination of the surface free energy of zeolite membranes is a key parameter to determine the solutes affinity with the active filtration layer. Flat mordenite (MOR-type) zeolite membranes were synthesized on α-alumina platelets by deep coating methodology. These membranes have undergone an alkali treatment. Surface and textural characterizations were performed before and after the mild alkali treatment in order to evaluate the modifications of the zeolite structure, surface charge and polarity. Results showed that the mild alkali treatment increases the hydrophilicity of Na-mordenite surface. The OWRK (Owens, Wendt, Rabel and Kaelble) method allowed following the variation of the polar component of the free energy due to the extraction of silicon atoms from the zeolite framework. These results contribute strongly in the understanding of mass transport in porous tubular ultrafiltration (UF)/nanofiltration (NF) zeolite membranes.
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Document Type: Research Article
Publication date: October 1, 2015
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