4.1 Article

Thermodynamics and kinetics to develop an analytical method for sensing of aqueous Hg(II) using caffeic acid decorated AgNPs

期刊

INORGANIC AND NANO-METAL CHEMISTRY
卷 53, 期 3, 页码 239-256

出版社

TAYLOR & FRANCIS INC
DOI: 10.1080/24701556.2022.2034012

关键词

Caffeic acid; colorimetric; CA-AgNPs; XPS and DFT calculations; kinetics and thermodynamics

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In this study, we developed a fast and selective detection method for Hg(II) ions in aqueous solutions using caffeic acid decorated silver nanoparticles. The method involves using a paper strip as a dipstick type device, which can detect Hg(II) ions in a concentration range of 20-0.0001 ppm with naked eyes.
Mercury (Hg) and its compounds are exceptionally noxious and extensively distributed in the atmosphere. We have used caffeic acid decorated silver nanoparticles (CA-AgNPs) for the colorimetric detection of the Hg(II) ions in the aqueous systems. In this method, a paper strip was simply used as a dipstick type device for the fast and selective detection of the aqueous Hg(II) ions. The paper strip displays a color change within 50 seconds with superior selectivity after being dipped into the solution containing a concentration of Hg(II) ions in the range of 20-0.0001 ppm. The developed method allows us to detect Hg(II) through naked eyes with a LOD of 0.0001 ppm. The interaction between prepared CA-AgNPs and Hg(II) was also studied using reactive kinetics, thermodynamic parameters and density functional theory (DFT). The proposed method can be a cost-effective tool for field-level applications for on-site real-time detection of mercury.

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