Preparation of Eu<sub>0.075</sub>Tb<sub>0.925</sub>-Metal Organic Framework as a Fluorescent Probe and Application in the Detection of Fe<sup>3+</sup> and Cr<sub>2</sub>O<sub>7</sub><sup>2−</sup>
Luminescent Ln-MOFs (Eu<sub>0.075</sub>Tb<sub>0.925</sub>-MOF) were successfully synthesised through the solvothermal reaction of Tb(NO<sub>3</sub>)<sub>3</sub>·6H<sub>2</sub>O, Eu(NO<sub>3</sub>)<sub>3</sub>·6H<s...
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| Autores principales: | , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/e4d62909fc0d43beb134563a2889d5ad |
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| Sumario: | Luminescent Ln-MOFs (Eu<sub>0.075</sub>Tb<sub>0.925</sub>-MOF) were successfully synthesised through the solvothermal reaction of Tb(NO<sub>3</sub>)<sub>3</sub>·6H<sub>2</sub>O, Eu(NO<sub>3</sub>)<sub>3</sub>·6H<sub>2</sub>O, and the ligand pyromellitic acid. The product was characterised by X-ray diffraction (XRD), TG analysis, EM, X-ray photoelectron spectroscopy (XPS), and luminescence properties, and results show that the synthesised material Eu<sub>0.075</sub>Tb<sub>0.925</sub>-MOF has a selective ratio-based fluorescence response to Fe<sup>3+</sup> or Cr<sub>2</sub>O<sub>7</sub><sup>2−</sup>. On the basis of the internal filtering effect, the fluorescence detection experiment shows that as the concentration of Fe<sup>3+</sup> or Cr<sub>2</sub>O<sub>7</sub><sup>2−</sup> increases, the intensity of the characteristic emission peak at 544 nm of Tb<sup>3+</sup> decreases, and the intensity of the characteristic emission peak at 653 nm of Eu<sup>3+</sup> increases in Eu<sub>0.075</sub>Tb<sub>0.925</sub>-MOF. The fluorescence intensity ratio (I<sub>653</sub>/I<sub>544</sub>) has a good linear relationship with the target concentration. The detection linear range for Fe<sup>3+</sup> or Cr<sub>2</sub>O<sub>7</sub><sup>2−</sup> is 10–100 μM/L, and the detection limits are 2.71 × 10<sup>−7</sup> and 8.72 × 10<sup>−7</sup> M, respectively. Compared with the sensor material with a single fluorescence emission, the synthesised material has a higher anti-interference ability. The synthesised Eu<sub>0.075</sub>Tb<sub>0.925</sub>-MOF can be used as a highly selective and recyclable sensing material for Fe<sup>3+</sup> or Cr<sub>2</sub>O<sub>7</sub><sup>2−</sup>. This material should be an excellent candidate for multifunctional sensors. |
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