Artículo
Functionalized graphene quantum dots obtained from graphene foams used for highly selective detection of Hg2+ in real samples
Llaver, Mauricio
; Barrionuevo, Santiago
; Prieto, Eduardo Daniel
; Wuilloud, Rodolfo German
; Ibañez, Francisco Javier
Fecha de publicación:
11/2022
Editorial:
Elsevier Science
Revista:
Analytica Chimica Acta
ISSN:
0003-2670
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Here we report the use of graphene quantum dots (GQDs), obtained from 3D graphene foam, functionalized with 8-hydroxyquinoline (8-HQ) for the sensitive and selective detection of Hg2+ via front-face fluorescence. The great surface area and active groups within the GQDs permitted the functionalization with 8-HQ to increase their selectivity toward the analyte of interest. The fluorescence probe follows the Stern-Volmer model, yielding a direct relationship between the degree of quenching and the concentration of the analyte. Diverse parameters, including the pH and the use of masking agents, were optimized in order to improve the selectivity toward Hg2+ down to a limit of detection of 2.4 nmol L−1. It is hereby demonstrated that the functionalized GQDs work perfectly fine under adverse conditions such as acidic pH and in the presence of a large number of cationic and anionic interferences for the detection of Hg2+ in real samples. Parallel measurements using cold vapor atomic fluorescence spectrometry also demonstrated an excellent correlation with the front-face fluorescence method applied here for real samples including tap, river, underground, and dam waters.
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Articulos(ICB)
Articulos de INSTITUTO INTERDISCIPLINARIO DE CIENCIAS BASICAS
Articulos de INSTITUTO INTERDISCIPLINARIO DE CIENCIAS BASICAS
Articulos(INIFTA)
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Articulos de INST.DE INV.FISICOQUIMICAS TEORICAS Y APLIC.
Citación
Llaver, Mauricio; Barrionuevo, Santiago; Prieto, Eduardo Daniel; Wuilloud, Rodolfo German; Ibañez, Francisco Javier; Functionalized graphene quantum dots obtained from graphene foams used for highly selective detection of Hg2+ in real samples; Elsevier Science; Analytica Chimica Acta; 1232; 11-2022; 1-9
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