Uranium is an important and toxic radioactive nuclide, which is usually exist in nature water as uranyl ions. In this work, we developed a rapid sensitive and selective analytical methods for detection uranyl ions in aqueous solution. The Eu 3 + incorporated MOF through post-synthesis strategy was obtained, which exhibits excellent turn-on and ratiometric fluorescence sensing ability toward uranyl ions with the limit of detection as low as 3 nM. Moreover, this probe also shows great selectivity towards uranyl ions in the presence of a wide range of environmentally interfering species and good sensing capacity in real water samples. We also discussed the sensing mechanism combine the XPS results and calculations.
Surface-enhanced Raman spectroscopy
(SERS) has been utilized for
rapid analysis of uranyl ions (UO
2
2+
) on account
of its fast response and high sensitivity. However, the difficulty
of fabricating a suitable SERS substrate for in situ analysis of uranyl
ions severely restricts its practical application. Hence, we proposed
flexible and adhesive SERS tape decorated with silver nanorod (AgNR)
arrays for in situ detection of UO
2
2+
. The SERS
tape was fabricated through a simple “paste & peel off”
procedure by transferring the slanted AgNR arrays from silicon to
the transparent tape surface. UO
2
2+
can be easily
in situ detected by placing the AgNR SERS tape into an aqueous solution
or pasting it onto the solid matrix surface due to the excellent transparent
feature of the tape. The proposed SERS tape with well-distributed
AgNRs effectively improved the reproducibility and sensitivity for
UO
2
2+
analysis. UO
2
2+
with
concentration as low as 100 nM was easily detected. Besides, UO
2
2+
adsorbed on an iron disc and rock surface also
can be rapidly in situ detected. With its simplicity and convenience,
the AgNR SERS tape-based SERS technique offers a promising approach
for environmental monitoring and nuclear accident emergency detection.
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