Abstract
A new colorimetric sensor based on gold/silver bimetallic nanoparticles (Au–Ag BNPs) for the sensitive and selective detection of mercury (II) was developed. Gold nanoparticles (AuNPs) were synthesized by Turkevich method. The surface modification of AuNPs was modified by the layer–by–layer technique using poly(diallyl dimethylammonium chloride) which provided positively charged of AuNPs. Negatively charged silver nanoparticles (AgNPs) were synthesized by chemical reduction using poly(4–styrenesulfonic acid–co–maleic acid) as the stabilizing agent. The layer–by–layer assembly deposition technique was used to prepare Au–Ag BNPs of positively and negatively charged of AuNPs and AgNPs, respectively. The synthesized Au–Ag BNPs were characterized by a UV-visible spectrophotometer, zeta potential analyzer, FT–IR, TEM, XRD, and EDX. The Au–Ag BNPs sensor was able to detect mercury (II) in aqueous solution, visibly changing from brownish–orange to purple. The linear relationships of the UV-visible spectrometry demonstrate that the Au–Ag BNPs-based colorimetric sensor can be used for the quantitative analysis of mercury (II) in the range of 0.5–80 mg L−1, with the correlation coefficient, r2 = 0.9818. The limit of detection (LOD) of mercury (II) was found to be 0.526 + 0.001 mg L−1. The BNPs is also verified to have a good practical applicability for mercury (II) detection in the real samples.
Highlights
Mercury (II) is a very toxic heavy metal, strongly harmful to living things
BNPs were locatedofat404 wavelength nmwhich and 531 nm,attributed which were to spectra of Au–Ag BNPs were located at wavelength of 404 nm and 531 nm, which were attributed to plasmon resonance of
A new colorimetric sensor based on Au–Ag bimetallic nanoparticles for the sensitive and selective detection of mercury (II) was developed
Summary
Mercury (II) is a very toxic heavy metal, strongly harmful to living things. Natural water can be contaminated by it through industrial waste. Its specific biogeochemical cycling allows bioaccumulation in the food chain leading to serious consequences for animals and humans. Its toxicity depends on a form of mercury and on its ability to accumulate in the environment. Mercury (II) is the main species found in water due to its high solubility [1]. One effect of mercury (II) is well known, namely Minamata syndrome, where the central nervous system, DNA, and mitosis are damaged [2]
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