Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 312, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128013
Keywords
Colorimetric paper; ZnSe; Belt-like nanoframes; Heavy metal ions; Cation exchange
Funding
- National Natural Science Foundation of China [61774159, 61474122]
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A colorimetric paper sensor based on a cation-exchange strategy has been developed for the visual determination of heavy metal ions. Belt-like ZnSe nanoframes as colorimetric reagents were prepared from ZnSe center dot 0.5N(2)H(4) hybrid nanobelts as precursors via a hydrothermal method. With the decomposition and release of N2H4 ligands, the regular belt-like nanostructures of the precursors evolved into belt-like nanoframes, which consisted of numerous ZnSe nanocrystals. Inspired by the cation-exchange characteristic of chalcogenides, the as-prepared belt-like ZnSe nanoframes were employed to fabricate a colorimetric paper sensor for the detection of heavy metal ions. Owing to the color change arising from a composition change, the colorimetric paper was successfully applied to detect Ag Cu2+, and Hg2+ at room temperature. Depending on the color change and its intensity, heavy metal ions of Ag+ Cu2+, and Hg2+ can be individually identified and their concentrations can be determined. Particularly for Cu2+, its visually detected concentration can be down to 1 ppm. More importantly, the fabricated colorimetric paper sensor displays excellent anti-interference properties from various typical cations and anions. Considering its low cost and practicality, expectedly it can be used for practical application.
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