研究目的
Investigating the direct construction of metal-organic frameworks (MOFs) from zero-valent metal substrates via a green hydrothermal method, elucidating formation mechanisms, and modulating structures to achieve unique morphologies and properties.
研究成果
The study successfully demonstrates a green, one-step hydrothermal method for direct MOF construction from zero-valent metals, yielding unique morphologies like core-shell structures and nanofibers with rigid frameworks resistant to hydration-induced deformation. This approach offers environmental benefits and high design flexibility for applications in catalysis, adsorption, and sensors.
研究不足
The synthesis requires H2O in the solution, limiting applicability to aqueous environments. Hydrothermal oxidation kinetics and thermodynamics vary with metal type, potentially restricting the method for some MOFs. The process may be slow due to diffusion limitations in thick MOF films.
1：Experimental Design and Method Selection:
Hydrothermal synthesis method was used to construct MOFs directly from zero-valent metal substrates without additional metal sources or chemicals. The design involved modulating temperature and solvent conditions to control morphology.
2：Sample Selection and Data Sources:
Al metal particles (99.99%, φ ≤ 10 μm, Goodfellow), Al, Cu, and Zn metal meshes (Alfa-Aesar), and organic ligands (H2BDC, BTC, BIM) were used. Data from SEM, TEM, XRD, NMR, TGA, and N2 adsorption-desorption isotherms were analyzed.
3：99%, φ ≤ 10 μm, Goodfellow), Al, Cu, and Zn metal meshes (Alfa-Aesar), and organic ligands (H2BDC, BTC, BIM) were used. Data from SEM, TEM, XRD, NMR, TGA, and N2 adsorption-desorption isotherms were analyzed. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Teflon-lined autoclave, PID temperature controller, SEM (XL-30 FEG, FEI), FETEM (Tecnai G2 F30ST, FEI) with EDS, XRD (X’Pert PW 3040, Philips), NMR (600 MHz SS NMR, Unity INOVA 600, Varian), TGA (Pyris 1TGA, Perkin Elmer), BET surface area analyzer (BELSORP-mini II, BEL Japan Inc.), UV-vis spectroscopy.
4：Experimental Procedures and Operational Workflow:
Synthesis involved hydrothermal reactions at specified temperatures and times with metal substrates and ligands in water or solvent mixtures. Samples were washed, dried, activated, and characterized using various techniques to analyze structure, morphology, and properties.
5：Data Analysis Methods:
XRD patterns analyzed for crystal structure, Scherrer equation for crystal size, BET method for surface area, BJH method for pore size distribution, NMR for local structure analysis, and UV-vis for dye adsorption kinetics.
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SEM
XL-30 FEG
FEI
Characterization of surface morphologies of samples
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FETEM
Tecnai G2 F30ST
FEI
Analysis of structures and elemental compositions with EDS
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TGA
Pyris 1TGA
Perkin Elmer
Thermogravimetric analysis for weight loss and stability
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XRD
X’Pert PW 3040
Philips
Obtaining powder XRD patterns for crystal structure analysis
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NMR
Unity INOVA 600
Varian
Solid-state NMR spectroscopy for local structure analysis
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BET surface area analyzer
BELSORP-mini II
BEL Japan Inc.
Determination of BET surface area, pore size distribution, and total pore volumes from N2 adsorption-desorption isotherms
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Autoclave
Teflon-lined
Hydrothermal synthesis of samples
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UV-vis spectroscopy
Measurement of dye concentrations in adsorption studies
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