研究目的
To develop a water-stable EuIII-based metal-organic framework with dual-emission luminescence for discriminative detection of nitroaromatic pollutants and other analytes in water.
研究成果
The Eu-MOF exhibits excellent water stability and dual-emission luminescence, enabling discriminative detection of acetone, Cr2O72? ions, and nitroaromatic compounds via ratiometric methods. It is the first LnIII-MOF to show such distinguishing fluorescence phenomena without relying solely on quenching, with mechanisms involving competitive energy absorption. This work advances the design of luminescent MOFs for practical environmental sensing applications.
研究不足
The framework has a limited solvent-accessible volume (8.4%), which may restrict analyte entry; mechanisms rely on surface interactions for some analytes; and the study is focused on specific NACs and ions, potentially not generalizable to all pollutants.
1：Experimental Design and Method Selection:
The study involved the solvothermal synthesis of a Eu-MOF using Eu(OAc)3·6H2O, NaCl, and HINO ligand in a water-ethanol mixture, followed by characterization and luminescence sensing experiments. Theoretical models included DFT calculations for energy levels.
2：Sample Selection and Data Sources:
The Eu-MOF was synthesized and used as the primary sample. Analytes included various anions (e.g., F?, Cl?, Br?, I?, CO32?, SO42?, NO3?, ClO4?, MnO4?, Cr2O72?) and nitroaromatic compounds (TNP, NB, PNT, PNP) in aqueous solutions.
3：List of Experimental Equipment and Materials:
Equipment included a Rigaku Ultima IV diffractometer for PXRD, Vario EL III Elementar analyzer for elemental analysis, Labsys NETZSCH TG 209 Setaram apparatus for TGA, Varian Cary Eclipse fluorescence spectrophotometer for luminescence spectra, Hitachi U-3010 spectrophotometer for UV-Vis spectra, FEI Nova Nano 230 SEM for EDS, and Oxford SuperNova diffractometer for single-crystal X-ray diffraction. Materials included Eu(OAc)3·6H2O, NaCl, HINO, HNO3, H2O, EtOH, and various analytes.
4：Experimental Procedures and Operational Workflow:
The Eu-MOF was synthesized solvothermally at 150°C for 3 days. Characterization involved PXRD, TGA, elemental analysis, luminescence, UV-Vis, and EDS measurements. Sensing experiments involved dispersing Eu-MOF in analyte solutions, measuring luminescence spectra, and performing recyclability tests.
5：Data Analysis Methods:
Data were analyzed using Stern-Volmer equations for quenching constants, DFT for energy level calculations, and software like SHELXL and Olex2 for structural refinement.
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diffractometer
SuperNova
Oxford
Used for single-crystal X-ray diffraction to determine the crystal structure of the Eu-MOF.
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diffractometer
Ultima IV
Rigaku
Used for powder X-ray diffraction (PXRD) measurements to characterize the crystal structure and phase purity of the Eu-MOF.
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spectrophotometer
U-3010
Hitachi
Used to collect UV-Vis spectra for analyzing absorption properties of analytes and the MOF.
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SEM
Nova Nano 230
FEI
Used for energy-dispersive spectroscopy (EDS) to analyze elemental composition and confirm the absence of certain elements after experiments.
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analyzer
Vario EL III
Elementar
Used for elemental analysis (C, H, N) of the synthesized Eu-MOF to determine its composition.
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TG apparatus
Labsys NETZSCH TG 209 Setaram
NETZSCH
Used for thermogravimetric analysis (TGA) to study the thermal stability and composition of the Eu-MOF.
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fluorescence spectrophotometer
Cary Eclipse
Varian
Used to obtain luminescence spectra of the Eu-MOF and analytes for sensing studies.
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