Journal
LUMINESCENCE
Volume 36, Issue 3, Pages 698-704Publisher
WILEY
DOI: 10.1002/bio.3990
Keywords
colorimetric sensing; functional; Hg2+; silver nanoparticles (Ag NPs)
Categories
Funding
- Education Department of Hunan Province [16C1388]
- Fund of Hengyang Key Laboratory [2018KJ110]
- National Natural Science Foundation of China [11205085]
- Natural Science Foundation of Hunan Province [2018JJ2323, 2020JJ5471]
- State Key Laboratory of Chemo/Biosensing and Chemometrics [2018010]
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A colorimetric sensing method based on l-Cys-Ag NPs was developed for detecting Hg2+ in aqueous solutions. The method showed good selectivity and sensitivity, with a detection limit of 8 nM, and has vast application potential for determination of Hg2+ in the environment.
A simple and sensitive colorimetric sensing method was constructed for detection of Hg2+ in aqueous solutions and based on silver nanoparticles functionalized with l-cysteine (l-Cys-Ag NPs). In this method, adenosine triphosphate (ATP) induced aggregation of l-Cys-Ag NPs. Simultaneously, the solution colour changed from bright yellow to brown. In the presence of Hg2+, Hg2+ chelated ATP to form a complex and reduce the degree of aggregation of l-Cys-Ag NPs and was accompanied by a colour change from brown to bright yellow. The changing values of absorbance at 390 nm were linearly correlated with concentration of Hg2+ over the 4.00 x 10(-8) to 1.04 x 10(-6) mol center dot L-1 range, with a detection limit of 8 nM. This method was used successfully for detection of Hg2+ in real water samples and performed good selectivity and sensitivity. The recovery range was 91.5-109.1%, indicating that the method has vast application potential for determination of Hg2+ in the environment.
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