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PCN-222 Metal-Organic Framework Nanoparticles with Tunable Pore Size for Nanocomposite Reverse Osmosis Membranes. | LitMetric

AI Article Synopsis

  • Researchers developed nanorods of a zirconium-based metal-organic framework (MOF), PCN-222, using a method that involved competing ligands to control crystal growth for use in reverse osmosis membranes.
  • They modified the MOF by binding myristic acid to change its channel dimensions, which was characterized using gas sorption and NMR techniques.
  • The modified MOF was incorporated into thin-film nanocomposite membranes, resulting in a significant increase in water flux (up to 95%) while still effectively rejecting salts, attributed to optimized water transport pathways.

Article Abstract

Nanorods of PCN-222, a large-pore, zirconium-based porphyrinic metal-organic framework (MOF), have been prepared through coordination modulation-controlled crystal growth through competing monodentate ligands known as modulators-for incorporation into reverse osmosis thin-film nanocomposite (TFN) membranes. Postsynthetic modification of the MOF node through binding of myristic acid (MA) altered channel dimensions and pore size distribution. The extent of MOF modification was characterized through Brunauer-Emmett-Teller gas sorption and H NMR following digestion of the particles. TFN membranes containing PCN-222 nanoparticles modified with varying levels of MA were fabricated via dispersion in the aqueous phase during interfacial polymerization, and the resulting flux and rejection performance of each membrane were evaluated. Increased water flux was observed with increasing MA content in the PCN-222 nanorods. Up to 95% increase in water flux was observed for a TFN containing 0.01 wt % loading of PCN-222 nanorods with a 10:1 MA to linker ratio, while maintaining high salt rejection. The flux change was attributed to tunable water transport through the nanorod pore structure and also through rapid water transport pathways at the nanorod-polymer interface.

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Source
http://dx.doi.org/10.1021/acsami.0c04349DOI Listing

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