Integrating cationic metal-organic frameworks with ultrafiltration membrane for selective removal of perchlorate from Water.

08:00 EDT 5th August 2019 | BioPortfolio

Summary of "Integrating cationic metal-organic frameworks with ultrafiltration membrane for selective removal of perchlorate from Water."

We design a novel cationic metal-organic framework hybrid ultrafiltration polyvinylidene fluoride membrane (PVA/Cu-iMOFs/PVDF-0.05) and report its unique capture of aqueous perchlorate (ClO) at ppm-level. This membrane outperformed traditional adsorption materials and exhibited a specific affinity toward ClO in the presence of various competing anions at greater levels (up to a concentration ratio of 20). In the batch experiment, the ClO removal ratio reached 99.6% over a wide pH range (3˜10). Membrane filtration by using a 12.56 cm PVA/Cu-iMOFs/PVDF-0.05 membrane could effectively treat 4.71 L of ClO-contaminated water before breakthrough occurred, while maintaining a satisfactory permeability (˜627.32 L/(m h bar)) and antifouling property. The exhausted membrane could easily be regenerated in aminoethanesulfonic acid solution for repeated use with a negligible decrease in capacity. Moreover, the membrane showed excellent long-term stability in a cross-flow filtration process due to the amido bond between the Cu-iMOFs and membrane surface as well as the "protection" of polyvinyl alcohol. Selective and reversible ion-exchange between the sulfonic acid (R-SO) ligands of Cu-iMOFs and tetrahedral oxo-anionic species was verified to be the pathway for ClO trapping. Thus, other problematic elements that also occur in tetrahedral form in water can be removed by this method.


Journal Details

This article was published in the following journal.

Name: Journal of hazardous materials
ISSN: 1873-3336
Pages: 120961


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