A new kind of chiral zirconium-based metal–organic framework, l-Cys-PCN-222, was synthesized by the SALI method and utilized as the chiral stationary phase in a capillary electrochromatography system for enantioseparation.
Quantum dots (QDs)
are a class of zero-dimensional nanocrystal materials, whose lengths
are limited to 2–10 nm. Their unique advantages such as
wide excitation spectra, narrow emission spectra, and high quantum
yield make their application possible in fluorescence sensing, wherein
QDs such as CdSe, CdTe, and CdS are used. Indeed, QDs have a wide
range of applications in fluorescence sensing, and there have been
many reports of applications based on QDs as ion probes. The emission
spectra of QDs can be adjusted by changing the size of the QDs or
doping them with other ions/elements. However, the high toxicity of
Cd and the poor anti-interference ability of single-emission fluorescent
probes greatly limit the applications of QDs in many fields. In this
paper, ZnS QDs are doped with the rare-earth element Ce to form a
low-toxicity double-emission ratiometric fluorescent sensor, ZnS:Ce,
for Hg2+ detection. The results of transmission electron
microscopy (TEM), X-ray diffractometry, X-ray photoelectron spectroscopy,
and optical spectroscopy show that ZnS:Ce QDs were successfully synthesized.
Under the optimal conditions, the concentration of Hg2+ was in the range of 10–100 μM, which had a linear relationship
with the fluorescence intensity of the ZnS:Ce QDs: the linear correlation
coefficient was 0.998, and the detection limit was 0.82 μM L–1. In addition, the fluorescent sensor had good selectivity
for Hg2+, and it was successfully applied to the detection
of Hg2+ in laboratory water samples.
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