Abstract
Heavy metal ion Cr(VI) content has been regarded as one of the most important indicators for discharged industrial wastewater. However, effective identification and detection of Cr(VI) analytes with high sensitivity and selectivity from various water environments remains a significant challenge. In this study, a novel luminescent material (labelled as Eu@Zr-MOF) with high water stability was assembled by post-modification of a zirconium-organic framework with lanthanide Eu3+ ions. And the coordination bonds binding between Eu3+ ions and carboxyl O atoms of Zr-MOF were confirmed by XPS technique. After Eu3+ ions were successfully immobilized within the Zr-MOF lattice, Eu@Zr-MOF exhibits a bright red fluorescence signal which was inherited from the unique luminescent feature of embedded Eu3+ ions. Notably, Eu@Zr-MOF can be deployed as a reliable photochemical sensor for quantitative fluorescence quenching detection of Cr2O72− ions based on the emission peak at 618 nm, showing rather high sensitivity (KSV = 6.746 × 104 M−1) and ultra low detection limit (DL = 5.71 ppb) which has been enhanced more than 3 times compared with pristine Zr-MOF. This study provides a reliable reference for the preparation of novel luminescent MOFs platform for efficient recognition and detection of Cr(VI) analytes.
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