Journal
TALANTA
Volume 185, Issue -, Pages 249-257Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2018.03.081
Keywords
Dual emissive carbon dots; Ratiometric fluorescent probe; Cr(VI) detection; Real samples
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Funding
- National Natural Science Foundation of China [21675068]
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As we know, hexavalent chromium (Cr(VI)) was usually used as an additive to improve the color fastness during the printing and dyeing process, and thus posing tremendous threat to our health and living quality. In this work, the dual emissive carbon dots (DECDs) were synthesized through hydrothermal treatment of m-aminophenol and oxalic acid. The obtained DECDs not only exhibited dual emission fluorescence peaks (430 nm, 510 nm) under the single excitation wavelength of 380 nm, but also possessed good water solubility and excellent fluorescence stability. A ratiometric fluorescent method for the determination of Cr(VI) was developed using the DECDs as a probe. Under the optimal conditions, a linear range was obtained from 2 to 300 mu M with a limit of detection of 0.4 mu M. Furthermore, the proposed ratiometric fluorescent method was applied to the analysis of Cr(VI) in textile, steel, industrial wastewater and chromium residue samples with satisfactory recoveries (88.4-106.8%).
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