A Water-Stable Ionic MOF for the Selective Capture of Toxic Oxoanions of SeVI and AsV and Crystallographic Insight into the Ion-Exchange Mechanism.
Angew Chem Int Ed Engl
; 59(20): 7788-7792, 2020 05 11.
Article
em En
| MEDLINE
| ID: mdl-32073736
ABSTRACT
Selectively capturing toxic oxoanions of selenium and arsenic is highly desired for the remediation of hazardous waste. Ionic metal-organic frameworks (iMOFs) especially cationic MOFs (iMOF-C) as ion-exchange materials, featuring aqueous phase stability, present a robust pathway for sequestration of the oxoanions owing to their ability to prevent leaching because of their ionic nature. On account of scarcity of water-stable cationic MOFs, the capture of oxoanions of selenium and arsenic has been a major challenge and has not been investigated using iMOFs. Herein, we demonstrate large scale synthesis of cationic MOF, viz. iMOF-1C that exhibits selective capture of oxoanions of SeVI (SeO42- ) and AsV (HAsO42- ) in water with a maximum sorption capacity of 100 and 85â
mg g-1 , respectively. This represents among the highest uptake capacities observed for selenate oxoanion in MOFs. Further, the ion-exchange mechanism was directly unveiled by single crystal analysis, which revealed variable modes of host-guest binding.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Oxigênio
/
Arsênio
/
Selênio
/
Água
/
Estruturas Metalorgânicas
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Angew Chem Int Ed Engl
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Índia