Preparation method of bore diameter adjustable hierarchical pore metal organic skeleton nanometer material, as well as obtained nanometer material and application thereof
A technology of metal-organic frameworks and nanomaterials, applied in the field of porous materials and enzyme immobilization, can solve the problems of poor chemical and thermal stability, porosity and specific surface area reduction, poor stability of MOFs, etc., and achieve good cycle performance and effective The effect of fixed, high-efficiency catalytic capacity
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Embodiment 1
[0058] Such as figure 1 As shown, at room temperature,
[0059] a. Dissolve 4 millimoles of zirconium tetrachloride in 72ml N, N dimethylamide (DMF), then add 80 millimoles of benzoic acid as an organic ligand, add terephthalic acid and 660 microliters of Concentrated hydrochloric acid (mass fraction 37%), after ultrasonication for 30min, let it stand in an oven at 120°C for 24 hours;
[0060] b. Centrifuge the material cooled to room temperature, wash with DMF three times, disperse in acetone to replace DMF, replace for three days, and replace acetone every 12 hours. Then vacuum-dried at 100°C for 24 hours to obtain a microporous zirconium-based metal-organic framework (micro-UiO-66);
[0061] c. Disperse 100 mg of microporous zirconium-based metal-organic framework (micro-UiO-66) in 1.6 mol / L of different monocarboxylic acid (formic acid FA, acetic acid AA, propionic acid PA and butyric acid BA) solutions, and stand at 100 ° C for 6 Hours later, wash with water and ethan...
Embodiment 2
[0068] Disperse 100 mg of microporous zirconium-based metal-organic framework (micro-UiO-66) in 1.6 mol / L propionic acid solution, let stand at 100°C for different times, wash with water and ethanol several times, and dry at 100°C for 24 hours to obtain different results. Hierarchical porous metal-organic framework nanomaterials with corrosion time.
[0069] Figure 5 It is the nitrogen adsorption-desorption curve and pore size distribution of each hierarchical porous metal organic framework nanomaterial obtained according to this embodiment. It can be seen that the 6-hour etching reaches equilibrium. The pore structure parameters of the samples with different etching times are given in Table 2 below, and it can be seen that the etching time of 6 hours is sufficient.
[0070] Table 2
[0071]
Embodiment 3
[0073] The implementation method and basic formula are the same as in Example 2, only the concentration of propionic acid is changed to 0.4, 0.8, 3.2, 4.8 and 5.6 mol / L to obtain hierarchical porous metal-organic framework nanomaterials with different propionic acid concentrations.
[0074] Figure 6 It is the nitrogen adsorption-desorption curve and pore size distribution diagram of each hierarchical porous metal organic framework nanomaterial obtained according to the present embodiment, Figure 7 It is a transmission electron micrograph of each hierarchical porous metal-organic framework nanomaterial obtained according to this embodiment. It can be found that the appearance of mesopores needs at least 0.8mol / L acid concentration, and the range of pores becomes larger with the increase of acid concentration. Table 3 below shows the pore structure parameters of etched samples with different acid concentrations. It can be seen that the concentration of monocarboxylic acid sho...
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