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Integrating cationic metal-organic frameworks with ultrafiltration membrane for selective removal of perchlorate from Water.
J Hazard Mater ; 381: 120961, 2020 01 05.
Artigo em Inglês | MEDLINE | ID: mdl-31412305
ABSTRACT
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 (ClO4-) at ppm-level. This membrane outperformed traditional adsorption materials and exhibited a specific affinity toward ClO4- in the presence of various competing anions at greater levels (up to a concentration ratio of 20). In the batch experiment, the ClO4- removal ratio reached 99.6% over a wide pH range (3˜10). Membrane filtration by using a 12.56 cm2 PVA/Cu-iMOFs/PVDF-0.05 membrane could effectively treat 4.71 L of ClO4--contaminated water before breakthrough occurred, while maintaining a satisfactory permeability (˜627.32 L/(m2 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-SO3) ligands of Cu-iMOFs and tetrahedral oxo-anionic species was verified to be the pathway for ClO4- trapping. Thus, other problematic elements that also occur in tetrahedral form in water can be removed by this method.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: J Hazard Mater Assunto da revista: Saúde Ambiental Ano de publicação: 2020 Tipo de documento: Artigo País de afiliação: China