Abstract
Water-soluble fluorescent probes for conveniently and rapidly monitoring the hazardous uranyl ions (UO22+) in nuclear wastewater are crucial for public nuclear security. Herein, we demonstrated a water-soluble CdSe/CdS/ZnS QDs probe by substituting hydrophilic dodecyl sodium sulfate (SDS) ligands for the original hydrophobic oleic acid ligands toward the rapid and accurate detection of trace UO22+ in aqueous environments. From this simple ligand exchange mothed, the as-prepared QDs probe exhibited a narrow full width at half maximum (FWHM) of 53 nm with an emission peak at 666 nm. Benefiting from dynamic and static fluorescence quenching interaction, this probe represented a high sensitivity (a detect limit of 15.4 nM), a high selectivity with comparison of presettable eight metal ions), a high environmental stability (a recovery rate of 81–94 %) and a rapid inspection ability (on the order of a few minutes). Therefore, this work provided a new approach for the determination of UO22+ in aqueous environments and then for the assurance of public nuclear security.
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