Ultrasound-assisted synthesis of luminescent micro-and nanocrystalline eu-based mofs as luminescent probes for heavy metal ions

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Abstract

The luminescent coarse-, micro-and nanocrystalline europium(III) terephthalate tetrahy-drate (Eu2bdc3‧4H2O) metal-organic frameworks were synthesized by the ultrasound-assisted wet-chemical method. Electron micrographs show that the europium(III) terephthalate microparticles are 7 μm long leaf-like plates. According to the dynamic light scattering technique, the average size of the Eu2bdc3‧4H2O nanoparticles is equal to about 8 ± 2 nm. Thereby, the reported Eu2bdc3‧4H2O nanoparticles are the smallest nanosized rare-earth-based MOF crystals, to the best of our knowledge. The synthesized materials demonstrate red emission due to the5D0–7FJ transitions of Eu3+ upon 250 nm excitation into1ππ* state of the terephthalate ion. Size reduction results in broad-ened emission bands, an increase in the non-radiative rate constants and a decrease in both the quantum efficiency of the5D0 level and Eu3+ and the luminescence quantum yields. Cu2+, Cr3+, and Fe3+ ions efficiently and selectively quench the luminescence of nanocrystalline europium(III) ter-ephthalate, which makes it a prospective material for luminescent probes to monitor these ions in waste and drinking water.

Original languageEnglish
Article number2448
Number of pages14
JournalNanomaterials
Volume11
Issue number9
DOIs
StatePublished - Sep 2021

Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

Keywords

  • Europium
  • Luminescence
  • Luminescent probe
  • Metal-organic framework
  • Nanoparticle
  • Rare earth
  • FE(III)
  • luminescent probe
  • PROTON CONDUCTIVITY
  • SORPTION
  • nanoparticle
  • SENSOR
  • metal-organic framework
  • luminescence
  • europium
  • FE3+
  • rare earth
  • ORGANIC FRAMEWORK
  • FLUORESCENT-PROBE
  • BASIC PYRIDYL SITES

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