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Method for preparing fibroin nanofiber and metal organic framework composite film

A technology of metal-organic frameworks and nanofibers, applied in the fields of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc. Advanced problems, to achieve the effect of uniform particles, high loading capacity, and improve filtration efficiency

Active Publication Date: 2017-08-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the limitation of high-performance films prepared by in-situ growth method is that the substrate lacks uniform nucleation sites, resulting in poor uniformity of the film, weak binding force and low loading rate.

Method used

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  • Method for preparing fibroin nanofiber and metal organic framework composite film
  • Method for preparing fibroin nanofiber and metal organic framework composite film
  • Method for preparing fibroin nanofiber and metal organic framework composite film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of ESF@ZIF-8 Composite Fiber Film by In-Situ Method

[0039] 1cm 2 The square ESF membrane was immersed vertically in 2mL 18.4mM zinc nitrate hexahydrate solution, and an equal volume of 1.38M 2-methylimidazole solution was added after 5 minutes. The purpose of standing still is to ensure that the nucleation in this system is uniform on the surface of the fiber, mix quickly and uniformly (about 10s), place it in a water bath at 38°C, and take it out after 2 hours of reaction. After washing with deionized water several times, the uniform ESF@ZIF-8 composite fiber film was prepared in a vacuum oven at 40°C for 24 hours.

[0040]Continuity, crystallinity:

[0041] The growth of ZIF-8 particles on the fiber surface of the prepared composite fiber film was observed by field emission scanning electron microscope. The results show that compared to the smooth ESF ( figure 1 ), due to the force between the polypeptide and the nanoparticles on the surface of the p...

Embodiment 2

[0055] Preparation of ESF@ZIF-67 Composite Thin Films by In Situ Method

[0056] 1cm 2 Submerge the square ESF membrane vertically in 32.4mM cobalt nitrate hexahydrate solution, let it stand for 5 minutes, add an equal volume of 1.38M 2-methylimidazole solution, mix quickly (about 10s) and place it in a water bath at 80°C , Take it out after 2h of reaction. After washing with deionized water three times, it was kept in a vacuum oven at 40°C for 24 hours to obtain a uniform ESF@ZIF-67 composite fiber film.

[0057] Continuity, crystallinity:

[0058] Field emission scanning electron microscopy was used to observe the growth of ZIF-67 particles on the surface of the prepared composite fiber film. Due to the force between the polypeptide on the surface of the protein fiber and the nanoparticles, the primary nanoparticles (~100nm) were evenly attached to the ESF fibers at the early stage of growth. surface. The nanoparticles grow gradually, and after two hours, from figure 2...

Embodiment 3

[0074] Preparation of ESF@ZIF-8 Composite Fiber Film by In-Situ Method

[0075] 1cm 2 The square ESF membrane was immersed vertically in 2mL 10mM zinc nitrate hexahydrate solution, and an equal volume of 690mM 2-methylimidazole solution was added after 5 minutes. The purpose of standing still is to ensure that the nucleation in this system is uniform on the surface of the fiber, mix quickly and uniformly (about 10s), place it in a water bath at 38°C, and take it out after 2 hours of reaction. After washing with deionized water several times, the uniform ESF@ZIF-8 composite fiber film was prepared in a vacuum oven at 40°C for 24 hours.

[0076] Continuity, crystallinity:

[0077] The growth of ZIF-8 particles on the fiber surface of the prepared composite fiber film was observed by field emission scanning electron microscope. The results show( Figure 7 ), compared to the smooth ESF ( figure 1 )and figure 2 As shown in (left), less ZIF-8 crystals are loaded on the surface ...

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Abstract

The invention discloses a method for preparing a fibroin nanofiber and metal organic framework composite film. The method includes: vertically immersing a fibroin nanofiber film into first ligand solution which contains metal ions; then adding second ligand solution, and enabling the fibroin nanofiber film and the two ligand solutions to react for specific time at a specific temperature so as to enable a metal organic framework substance to grow on the surface of the fibroin nanofiber film, so that the composite film is formed; taking out the composite film, washing with deionized water, and drying to obtain the film. By adoption of the method, problems of nonuniformity in nucleating and poor processability in a metal organic frame film preparation process are solved, the film has advantages of simplicity in preparation, high filter efficiency, high capacity, particle uniformity, high stability, high film continuity and the like, the adsorption performance is improved, and adsorption of various organic and inorganic substances and wide application are realized.

Description

technical field [0001] The invention relates to a new method for preparing a high-performance composite film, in particular to a method for preparing a silk protein nanofiber (ESF)-metal organic framework (MOFs) composite film and its application in removing organic and inorganic pollutants in water bodies. Background technique [0002] Due to its low energy consumption, high efficiency, simple equipment, and convenient operation, thin film materials meet the needs of modern industry for intensive production, and have great development prospects in the fields of separation, enrichment, and catalysis. At present, most of the films that have been industrialized are organic films, which have the advantages of low cost and easy processing, but their thermal stability and chemical stability are poor, their life is short, their selectivity is poor, and their adsorption capacity and efficiency are relatively low. restricts its practical application. Due to their good thermal stabi...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/223B01J20/24B01J20/28033C02F1/285C02F1/286
Inventor 李延斌傅迎春李志尚
Owner ZHEJIANG UNIV
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