Colorimetric mercury detection with enhanced sensitivity using magnetic-Au hybrid nanoparticles
Due to the neural toxicity of mercury, there is a need for the development of on-site detection systems for Hg 2+ monitoring. To this end, a new colorimetric mercury detection probe, Fe 3 O 4 @SiO 2 @Au (magnetic-Au; Mag-Au) hybrid nanoparticles, has been developed. The Au on the surface of Mag-Au i...
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Published in | Nanoscale advances Vol. 5; no. 11; pp. 384 - 39 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
England
RSC
30.05.2023
|
Subjects | |
Online Access | Get full text |
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Summary: | Due to the neural toxicity of mercury, there is a need for the development of on-site detection systems for Hg
2+
monitoring. To this end, a new colorimetric mercury detection probe, Fe
3
O
4
@SiO
2
@Au (magnetic-Au; Mag-Au) hybrid nanoparticles, has been developed. The Au on the surface of Mag-Au is an indicator of Hg
2+
, which forms an AuHg alloy (amalgam) on their surface (Mag-Au@Hg), with excellent peroxidase-like activity. The oxidation of 3,3′,5,5′-tetramethylbenzidine by Mag-Au@Hg resulted in a color change of the indicator solution, which was enhanced with increasing Hg
2+
concentration. Mag-Au can be used to detect Hg
2+
at nanomolar concentrations. Additionally, magnetic separation can be used to easily purify and concentrate the Mag-Au@Hg from samples, and thus avoid interference from unwanted residues or colored samples. The feasibility of Mag-Au for Hg
2+
detection was tested with an artificial urine solution and it can be used to detect Hg
2+
in various real samples, such as river water, seawater, food, and biological samples.
Mag-Au is an efficient colorimetric probe for detecting Hg
2+
ions, effectively avoiding interference from unwanted residues or colored samples while enhancing its detection capability. |
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Bibliography: | Mag-Au, ROS generation test by Mag-Au@Hg, and comparison of catalytic effect of Mag-Au in various condition. See DOI 2 3 https://doi.org/10.1039/d3na00129f 4 Electronic supplementary information (ESI) available: Synthetic protocols and TEM images of Fe Au seeds, and Mag-Au, confirmation of amalgam formation on Mag-Au using XPS analysis, detection capability of Fe SiO O Fe |
ISSN: | 2516-0230 2516-0230 |
DOI: | 10.1039/d3na00129f |