Nanofiber molecular sieve membrane, preparation method and application

A nanofiber and molecular sieve technology, applied in chemical instruments and methods, membranes, membrane technologies, etc., can solve the problems of isotropic and neutral small molecules or ion sieving, achieve good inhibition effect and improve small molecule selectivity , the effect of retaining water permeability

Pending Publication Date: 2022-05-24
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem in the prior art that the separation membrane obtained by modifying graphene oxide on the base membrane supported by nanofibers cannot better screen isotropic and neutral small molecules or ions

Method used

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  • Nanofiber molecular sieve membrane, preparation method and application
  • Nanofiber molecular sieve membrane, preparation method and application
  • Nanofiber molecular sieve membrane, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Preparation of PANI / PI electrospinning base film

[0042] The PI and PANI were placed in a vacuum drying oven at 70 °C overnight to remove moisture, and then the spinning solution was prepared. 0.12 wt% LiCl, 14 wt% PI, 8 wt% PANI were dissolved in DMF, respectively, and mechanically stirred at 70 °C for 2 days until the polymer was fully dissolved. Lithium chloride was added to enhance the conductivity of the spinning solution and the solubility of PANI. In addition, in order to prevent the incompletely dissolved PANI nanoparticles from clogging the injection syringe, the spinning solution was centrifuged at 12500 rpm for 30 min, and the fully dissolved casting solution in the upper layer was injected into a dispenser containing 20# (inner diameter of 0.61 mm). needle in the injection syringe. Replace it with a 21# metal needle with an inner diameter of 0.5mm and an outer diameter of 0.8mm, and connect it to the positive pole of the high-voltage DC power su...

Embodiment 2

[0046] Example 2 Preparation of Antibacterial Composite Molecular Sieve Membrane

[0047] First, prepare a GO dispersion with a concentration of 0.8 mg / L in a 100 mL silk-neck bottle, and use an ultrasonic cell crusher to sonicate for 2 h. Then Ag ion compound (AgNO 3or AgO) was dissolved in 100 g of deionized water to make the concentration 0.05wt%, and CB6 was added to a concentration of 0.0005wt%. After it was completely dissolved, 4 mL of the above ultrasonic GO dispersion was added, stirred evenly, and then the pressure-assisted filtration method was used. , 150mL of the above mixed solution was deposited on the PANI / PI nanofiber base film under 4bar pressure to form a uniform coating layer (the content of each component is small, but the volume of the coating solution is large, which can make the coating layer more uniform) . The prepared composite molecular sieve membrane was placed in a blast drying oven at 200 °C for heating and reduction for 3 h, and finally the rG...

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Abstract

The invention relates to a nanofiber molecular sieve separation membrane as well as a preparation method and application thereof, and belongs to the technical field of membrane separation. The nanofiber molecular sieve membrane comprises a base membrane and a selective separation layer covering the surface of the base membrane, the selective separation layer is composed of reduced graphene oxide (rGO) nanosheets, and the space between the nanosheets is filled with a host-guest compound composed of Ag and cucurbituril. GO nanosheets with Ag and CB6 host-guest compounds as an intermediate cross-linking agent are used as a molecular sieve selection layer, the nanostructure and characteristics of the GO layer are adjusted through thermal reduction, a nano transmission channel is precisely constructed through a host and a guest, the micromolecule selectivity can be improved, and meanwhile water permeability can be reserved.

Description

technical field [0001] The invention relates to a nanofiber molecular sieve membrane, a preparation method and an application, and belongs to the technical field of membrane separation. Background technique [0002] Due to the advantages of tunable wettability, good flexibility, high porosity and channel penetration, electrospun nanofiber-based membranes have attracted increasing attention in the field of composite molecular sieve membranes. [0003] CN108837715A patent discloses a solvent-resistant solvent-resistant surface modified by vacuum filtration through a modification solution composed of triethylenetetramine (TETA) and graphene oxide (GO) on the surface of a polyimide film Nanofiltration. Although it is found in this patent that long-chain crosslinking agents can effectively inhibit the swelling of GO sheets and achieve precise sieving of charged dye molecules in polar solvents. However, its interlayer spacing is not conducive to sieving homogenous and neutral sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/02B01D67/00C02F1/44C02F101/14
CPCB01D69/12B01D71/028B01D67/0079C02F1/44C02F2101/14B01D2325/48Y02A20/131
Inventor 孙世鹏刘美玲李璐邢卫红
Owner NANJING UNIV OF TECH
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