Journal
TALANTA
Volume 196, Issue -, Pages 515-522Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2018.12.088
Keywords
Luminescent metal organic frameworks; Adsorption; Copper and uranium contamination; Detection
Categories
Funding
- National Natural Science Foundation of China [21790370, 21790374, 21601131, 21761132019]
- Science Challenge Project [TZ2016004]
- Young Thousand Talented Program
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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We report here the investigation of using a luminescent europium organic framework, [Eu-2(MTBC) (OH)(2)(DMF)(3)(H2O)(4)]center dot 2DMF center dot 7H(2)O (denoted as compound 1), for detecting of both Cu2+ and UO22+ with high sensitivity. Based on the spectroscopy analysis, compound 1 could selectively respond to Cu2+ and UO22+ ions among other selected monovalent, divalent, trivalent metal cations based on a turn-off mechanism. The detection limit of compound 1 towards Cu2+ ion was as low as 17.2 mu g/L, which is much lower than the maximum tolerable concentration of Cu2+ in drinking water (2 mg/L) defined by United States Environmental Protection Agency. On the other hand, the detection limit towards UO22+ ions is 309.2 mu g/L, which could be used for detecting uranium in relative severely contaminated areas. The concentration-dependent luminescence intensity evolution process could be fully understood by the absorption kinetics and isotherm investigations. Furthermore, the quenching mechanism was elucidated by the UV-vis, excitation, luminescence, and lifetime studies. Compound 1, as the first MOF based luminescence probe for both Cu2+ and UO22+ ions, provides insight into developing MOF-based multifunctional sensors for both nonradioactive and radioactive elements.
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