Extraction of cupric ions with ionic liquids containing polypyridine-type small molecules or peripherally pyridine-modified dendrimers.
Chem Asian J
; 7(10): 2438-45, 2012 Oct.
Article
en En
| MEDLINE
| ID: mdl-22833356
ABSTRACT
The hydrophobic ionic liquid N-butyl-N-methylpyrrolidinium bis((trifluoromethyl)sulfonyl)amide (BMP-TFSA IL), which contains a series of flexible ionophores of polypyridine-type small molecules or two rigid ionophores of peripherally pyridine-modified PAMAM dendrimers, was used to extract cupric ions from aqueous solutions. The polypyridine-type ionophores show good selectivity toward cupric ions at pHâ
2. The selectivity is affected by the spacing between the two amino groups. However, the pyridine-modified dendrimers showed poor selectivity, although their extraction efficiency still depended on the pH of the aqueous solution. The ionic liquids that contained small molecular ionophores and their dendrimer analogs were reused after acid washing or electrochemical reduction. During acid washing, the nitrogen atoms of the ionophores were protonated to release the cupric ions into the aqueous phase, and the copper atoms were deposited onto the electrode surface during the electrochemical reduction accompanied by the regeneration of the ionophores.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Cobre
/
Dendrímeros
/
Líquidos Iónicos
Idioma:
En
Año:
2012
Tipo del documento:
Article