Metal organic framework-derived CuO/Cu2O polyhedron-CdS quantum dots double Z-scheme heterostructure for cathodic photoelectrochemical detection of Hg2+ in food and environment.
Food Chem
; 450: 139261, 2024 Aug 30.
Article
en En
| MEDLINE
| ID: mdl-38657344
ABSTRACT
This study employed an innovative copper oxide/cuprous oxide (CuO/Cu2O) polyhedroncadmium sulphide quantum dots (CdS QDs) double Z-scheme heterostructure as a matrix for the cathodic PEC determination of mercury ions (Hg2+). First, the CuO/Cu2O polyhedral composite was prepared by calcining a copper-based metal organic framework (Cu-MOF). Subsequently, the amino-modified CuO/Cu2O was integrated with mercaptopropionic acid (MPA)-capped CdS QDs to form a CuO/Cu2O polyhedron-CdS QDs double Z-scheme heterostructure, producing a strong cathodic photocurrent. Importantly, this heterostructure exhibited a specifically reduced photocurrent for Hg2+ when using CdS QDs as Hg2+-recognition probe. This was attributed to the extreme destruction of the double Z-scheme heterostructure and the in situ formation of the CuO/Cu2O-CdS/HgS heterostructure. Besides, p-type HgS competed with the matrix for electron acceptors, further decreasing the photocurrent. Consequently, Hg2+ was sensitively assayed, with a low detection limit (0.11 pM). The as-prepared PEC sensor was also used to analyse Hg2+ in food and the environment.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Sulfuros
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Compuestos de Cadmio
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Cobre
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Puntos Cuánticos
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Técnicas Electroquímicas
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Estructuras Metalorgánicas
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Mercurio
Idioma:
En
Revista:
Food Chem
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Food chem
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Food chemistry
Año:
2024
Tipo del documento:
Article