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Preparation method of MOFs-chitosan nanofiber composite membrane

A chitosan nano-fiber composite technology, which is applied in the field of preparation of MOFs-chitosan nanofiber composite membranes, can solve the problems of poor dispersion of MOFs, poor binding fastness between MOFs and chitosan, and easy falling off of MOFs. Excellent water resistance and solvent resistance, high MOFs retention rate, simple and easy preparation method

Active Publication Date: 2018-12-18
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the MOFs-chitosan materials prepared by blending have the disadvantages of poor binding fastness between MOFs and chitosan, easy falling off of MOFs, and poor dispersion of MOFs in chitosan solution. At the same time, there is no chitosan material at this stage A report on the blending of nanofibers and MOFs

Method used

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  • Preparation method of MOFs-chitosan nanofiber composite membrane
  • Preparation method of MOFs-chitosan nanofiber composite membrane
  • Preparation method of MOFs-chitosan nanofiber composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of ZIF-8-chitosan nanofiber composite film

[0034] 1) Preparation of chitosan nanofibers: chitosan and polyethylene oxide are slowly added to glacial acetic acid respectively as the total solution, wherein the final concentration (mass concentration) of glacial acetic acid in the total solution is 3%, and chitosan accounts for 1% of the total solution mass, polyethylene oxide accounts for 0.5% of the total solution mass, turn on the magnetic stirrer, the rotating speed is 500r / min, and the solid is completely dissolved after stirring for 30min; A 5mL syringe was used to extract the solution for electrospinning. Tin foil was used as the receiving plate. The spinning conditions were: positive pressure 2.0KV, negative pressure -5.0KV, injection speed 0.02mm / min, translational speed 100mm / min, The rotating speed of receiving drum is 5r / min; After spinning finishes, tinfoil is taken off, is cut into the fritter of 2cm * 2cm, chitosan fiber is peeled off from tin...

Embodiment 2

[0041] Preparation of ZIF-67-chitosan nanofiber composite membrane

[0042] 1) Preparation of chitosan nanofibers: Chitosan and polyethylene oxide are slowly added to glacial acetic acid respectively as the total solution, wherein the final concentration (mass concentration) of glacial acetic acid in the total solution is 5%, and chitosan accounts for 3% of the total solution mass, polyethylene oxide accounts for 1% of the total solution mass, turn on the magnetic stirrer, the rotating speed is 500r / min, and the solid is completely dissolved after stirring for 30min; A 5mL syringe was used to extract the solution for electrospinning, using tin foil as the receiving plate, the spinning conditions were: positive pressure 13KV, negative pressure -10.0KV, injection speed 0.02mm / min, translational speed 500mm / min, receiving The rotating speed of drum is 30r / min; After spinning finishes, tinfoil is taken off, cut into the fritter of 2cm * 2cm, chitosan fiber is peeled off from tinfo...

Embodiment 3

[0051] Preparation of MIL-101(Cr)-chitosan nanofiber composite film

[0052] 1) Preparation of chitosan nanofibers: chitosan and polyoxyethylene were slowly added to glacial acetic acid respectively as the total solution, wherein the final concentration (mass concentration) of glacial acetic acid in the total solution was 4%, and chitosan accounted for the total 2% of the solution mass, polyethylene oxide accounts for 0.1% of the total solution mass, turn on the magnetic stirrer, the rotation speed is 500r / min, and the solid dissolves completely after stirring for 30min; The syringe extracts the solution for electrospinning, using tin foil as the receiving plate, the spinning conditions are: positive pressure 5.0KV, negative pressure -6.0KV, injection speed 0.05mm / min, translation speed 300mm / min, receiving The rotating speed of drum is 20r / min; After spinning finishes, tinfoil is taken off, cut into the fritter of 2cm * 2cm, chitosan fiber is peeled off from tinfoil;

[0053...

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Abstract

The invention belongs to the technical field of preparation of polymer materials and particularly relates to a preparation method of a MOFs-chitosan nanofiber composite membrane. The preparation method comprises: preparing chitosan nanofibers through an electrospinning method, and blending a synthesized MOFs material and the chitosan nanofibers so that the MOFs material and chitosan nanofibers arecompounded under the action of a cross-linking agent to form the MOFs-chitosan nanofiber composite membrane. The MOFs-chitosan nanofiber composite membrane effectively solves the problem of low strength, poor stability and poor dispersibility of the MOFs material in the chitosan fibers. The MOFs-chitosan nanofiber composite membrane has the advantages of high MOFs retention rate, high strength, excellent water resistance and excellent solvent resistance. The preparation method is simple and easy, the preparation conditions are mild, the preparation method is suitable for large-scale production, and the MOFs-chitosan nanofiber composite membrane can be used in the fields of dye adsorption, metal ion adsorption, gas adsorption and storage.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, in particular to a preparation method of MOFs-chitosan nanofiber composite film. Background technique [0002] Chitosan (Chitosan) is a natural cationic polymer that widely exists in nature. It has the advantages of cheap, non-toxic, biodegradable, and good film-forming properties. It is the second largest renewable resource in the world after cellulose. Chitosan fiber is usually a fiber made by wet spinning after deacetylation of chitin by concentrated alkali treatment. It has a wide range of applications in medical and health fields. [0003] Metal-organic frameworks (MOFs) materials are coordination polymers self-assembled by multidentate organic ligands containing oxygen, nitrogen, etc. (mostly aromatic polyacids and polybases) and transition metal ions. MOFs, as an ultra-low-density porous material, have wider application prospects in gas adsorption and storage, dye ad...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J3/24C08L5/08C08L87/00
CPCC08J3/246C08J5/18C08J2305/08C08J2487/00
Inventor 吴美燕李滨刘超于光冯晓燕张跃冬咸漠
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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