Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 427, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.128135
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Funding
- National Key Research and Development Project [2019YFC1605800]
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The detection of mercury is important for assessing its toxicity and health risks. In this study, ultra-thin two-dimensional palladium nanosheets (PdNS) were synthesized for the simple, sensitive, accurate, and cheap detection of Hg2+. The PdNS showed high selectivity and sensitivity, and a detection kit was developed for Hg2+ detection using naked eye or cellphone at a low cost.
The detection of mercury, one of the ten most dangerous chemicals, is significant to provide helpful information for assessing mercury toxicity and health risks. However, it is a challenge to explore simple, sensitive, accurate, and cheap Hg2+ detection methods. Noble metal nanomaterials are used for Hg2+ detection by the colorimetric method widely. Still, the pure noble metal materials' detection limit of Hg2+ is high, and sensitivity enhancement usually requires further complex modification. Here, we use a facile one-step route to synthesize ultra-thin two-dimensional palladium nanosheets (PdNS), which have high selectivity and sensitivity for Hg2+ detection by colorimetric method with a low detection limit (0.55 ppb). The detection of Hg2+ by PdNS involves multiple mechanisms, including the formation of amalgam and PdO to improve the peroxidase-mimic activity of PdNS and PdNS motor function to increase its collision probability with the detection reactant. The PdNS can be used to detect Hg 2+ in various actual samples. The detection results are highly consistent with the data obtained by the atomic fluorescence spectrometer (AFS). Then, we developed a Hg2+ detection kit, which can realize simple, sensitive, and accurate Hg2+ detection by naked eye or cellphone at a meager cost (0.3 dollars each sample).
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