1. Cation-exchange strategy for a colorimetric paper sensor: Belt-like ZnSe nanoframes toward visual determination of heavy metal ions.
- Author
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Dong, Ren-E, Kang, Ping, Xu, Xiao-Liang, Cai, Liu-Xin, and Guo, Zheng
- Subjects
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METAL ions , *HEAVY metals , *SILVER ions , *COLOR change sensors , *OSTWALD ripening , *METAL detectors - Abstract
Employing belt-like ZnSe nanoframes as colorimetric reagents, a colorimetric paper sensor based on the cation-exchange strategy has been developed for the visual determination of heavy metal ions. • A colorimetric paper sensor based on a cation-exchange strategy has been developed for the detection of heavy metal ions. • Due to Ostwald ripening, novel belt-like ZnSe nanoframes have been synthesized via a facile hydrothermal method. • Depending on the color change of the paper sensor, heavy metal ions of Ag+, Cu2+, and Hg2+ can be individually identified. 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·0.5N 2 H 4 hybrid nanobelts as precursors via a hydrothermal method. With the decomposition and release of N 2 H 4 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. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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