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 lack

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

Example Embodiment

[0037] Example 1

[0038] In-situ preparation of ESF@ZIF-8 composite fiber membrane

[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 is to ensure that the nucleation in the system is even on the surface of the fiber. After mixing quickly (about 10s), it is placed in a 38°C water bath, and the reaction is taken out after 2 hours. After washing with deionized water several times, in a vacuum drying oven at 40°C for 24 hours, a uniform ESF@ZIF-8 composite fiber film can be obtained.

[0040] Continuity, crystallinity:

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

Example Embodiment

[0054] Example 2

[0055] In-situ preparation of ESF@ZIF-67 composite film

[0056] 1cm 2 The square ESF membrane was immersed vertically in a 32.4mM cobalt nitrate hexahydrate solution. After standing for 5 minutes, adding an equal volume of 1.38M 2-methylimidazole solution, mixing quickly (about 10s) and placing it in a water bath at 80℃ , Take out after 2h reaction. After washing with deionized water for three times and keeping it in a vacuum drying oven at 40°C for 24 hours, a uniform ESF@ZIF-67 composite fiber film is obtained.

[0057] Continuity, crystallinity:

[0058] Field emission scanning electron microscope 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 peptides on the surface of the protein fiber and the nanoparticles, the primary nanoparticles (~100nm) were uniformly attached to the ESF fibers at the initial stage of growth. surface. The nanoparticles gradually grow, two hours later...

Example Embodiment

[0073] Example 3

[0074] In-situ preparation of ESF@ZIF-8 composite fiber film

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

[0076] Continuity, crystallinity:

[0077] The field emission scanning electron microscope was used to observe the growth of ZIF-8 particles on the fiber surface in the prepared composite fiber film. The results show that( Figure 7 ), compared to smooth ESF( figure 1 )and figure 2 (Left) shows that there are fewer ZIF-8 crystals on the ...

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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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