In:
Water Science & Technology, IWA Publishing, Vol. 88, No. 3 ( 2023-08-01), p. 572-585
Kurzfassung:
Microcystins with leucine arginine (MC-LR) is a virulent hepatotoxin, which is commonly present in polluted water with its demethylated derivatives [Dha7] MC-LR. This study reported a low-cost molecularly imprinted polymer network-based electrochemical sensor for detecting MC-LR. The sensor was based on a three-dimensional conductive network composed of multi-walled carbon nanotubes (MWCNTs), graphene quantum dots (GQDs), and gold nanoparticles (AuNPs). The molecularly imprinted polymer was engineered by quantum chemical computation utilizing p-aminothiophenol (p-ATP) and methacrylic acid (MAA) as dual functional monomers and L-arginine as a segment template. The electrochemical reaction mechanism of MC-LR on the sensor was studied for the first time, which is an irreversible electrochemical oxidation reaction involving an electron and two protons, and is controlled by a mixed adsorption–diffusion mechanism. The sensor exhibited a great detection response to MC-LR in the linear range of 0.08–2 μg/L, and the limit of detection (LOD) is 0.0027 μg/L (S/N = 3). In addition, the recoveries of the total amount of MC-LR and [Dha7] MC-LR in the actual sample by the obtained sensor were in the range from 91.4 to 116.7%, which indicated its great potential for environmental detection.
Materialart:
Online-Ressource
ISSN:
0273-1223
,
1996-9732
DOI:
10.2166/wst.2023.238
Sprache:
Englisch
Verlag:
IWA Publishing
Publikationsdatum:
2023
ZDB Id:
764273-8
ZDB Id:
2024780-1
SSG:
14
