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

Active Publication Date: 2018-06-05
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have relatively large defects and limitations
For example, in the ligand extension method, on the one hand, the extension of the ligand will cause the interpenetration of the pores, resulting in a decrease in porosity and specific surface area; on the other hand, the extension of the ligand will lead to structural instability, which is very unfavorable for the application of materials. It is true that some hierarchical porous metal-organic frameworks can be prepared by the template method, but in many cases the removal of the template will cause the collapse of the channels, and the presence of the template will lead to local amorphi...

Method used

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  • Preparation method of bore diameter adjustable hierarchical pore metal organic skeleton nanometer material, as well as obtained nanometer material and application thereof
  • Preparation method of bore diameter adjustable hierarchical pore metal organic skeleton nanometer material, as well as obtained nanometer material and application thereof
  • Preparation method of bore diameter adjustable hierarchical pore metal organic skeleton nanometer material, as well as obtained nanometer material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a preparation method of a bore diameter adjustable hierarchical pore metal organic skeleton nanometer material. The preparation method comprises the following steps: synthesizing terephthalic acid with a zircon salt at the existence of a conditioning agent through a solvent thermal method to form a micropore zirconium-based metal organic skeleton; activating the microporezirconium-based metal organic skeleton with a low boiling point solvent and then drying to obtain an activated micropore zirconium-based metal organic skeleton; and dispersing the activated microporezirconium-based metal organic skeleton into 0.8 to 5.6 mol/L of monocarboxylic acid at the temperature of 25 to 180 DEG C for etching so as to obtain the hierarchical pore metal organic skeleton nanometer material. The invention also relates to the obtained bore diameter adjustable hierarchical pore metal organic skeleton nanometer material and application thereof. In short, according to the preparation method in the invention, a part of micropores is retained in the process that hierarchical pores are formed through etching of monocarboxylic acid, so that the obtained hierarchical pore metalorganic skeleton has chemical stability and heat stability similar to those of an original micropore skeleton.

Description

technical field [0001] The invention relates to the field of porous materials and enzyme immobilization, in particular to a method for preparing a multi-level porous metal-organic framework nanomaterial with adjustable pore size, the obtained nanomaterial and its application. Background technique [0002] Metal-organic frameworks (MOFs), as a porous material self-assembled from metal clusters and organic ligands, have been extensively studied and developed rapidly in recent years. Compared with traditional porous materials, MOFs have designable topology, tunable physicochemical properties, and variety of species. It has been widely used in the fields of gas adsorption and separation, catalysis, molecular sensing and drug release (Chem. Dalton Trans., 2016, 45, 18003-18017; CrystEngComm, 2015, 17, 706-718). However, it is obvious that the size of the pores and the channel environment determine the diffusion of guest molecules in MOFs, and the good diffusion of guest molecul...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C12N11/02
CPCB01J20/226B01J20/28078C12N9/0065C12N11/02C12Y111/01007
Inventor 杨鹏飞江邦和季华顾金楼
Owner EAST CHINA UNIV OF SCI & TECH
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