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. 2021 Dec 23;12(1):14. doi: 10.3390/membranes12010014

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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SEM micrographs of the surface at different magnifications of nanofiltration-supported (a) PIM-1, (b) PIM-1/MIL-125, and (c) PIM-1/MIL-140A membranes.