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Preparation method of carbon nanofiber/β-cyclodextrin-based nanofiber membrane with sandwich structure

A technology of carbon nanofibers and nanofiber membranes, applied in the field of nano-functional membrane materials, can solve problems such as secondary pollution, achieve the effect of preventing mechanical damage, avoiding secondary pollution, and being easy to implement

Active Publication Date: 2020-07-03
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the filter membrane is filtering extremely toxic heavy metal ions, it is necessary to take into account the problem of fixation after adsorption, so as to avoid the serious secondary pollution of the concentrated solution with high concentration of heavy metal ions on the surrounding of the filter membrane.

Method used

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  • Preparation method of carbon nanofiber/β-cyclodextrin-based nanofiber membrane with sandwich structure
  • Preparation method of carbon nanofiber/β-cyclodextrin-based nanofiber membrane with sandwich structure
  • Preparation method of carbon nanofiber/β-cyclodextrin-based nanofiber membrane with sandwich structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The lower layer is an electrospun carbon nanofiber / nylon 66 composite nanofiber membrane.

[0024] The preparation method of the lower layer is to stir acidified carbon nanofibers and nylon 66 in formic acid until they are uniformly dispersed, wherein the mass fraction of nylon 66 is 8%, and the quality of carbon nanofibers is 3wt% of the quality of nylon 66. After being completely dissolved, The spinning liquid is obtained, and the spinning liquid is electrospun and collected on the surface of the receiving plate.

[0025] The middle layer is an electrospun carbon nanofiber / β-cyclodextrin-polyacrylic acid-citric acid nanofiber membrane.

[0026] The preparation method of the middle layer is to dissolve β-cyclodextrin in N,N-dimethylformamide and stir until completely dissolved, wherein the mass fraction of β-cyclodextrin is 10wt%; Add acidified carbon nanofibers, citric acid, and polyacrylic acid, and stir until they are completely dissolved. The quality of the three ...

Embodiment 2

[0031] The lower layer is an electrospun carbon nanofiber / nylon 6 composite nanofiber membrane: stir the acidified carbon nanofiber and nylon 6 in formic acid until uniformly dispersed, wherein the mass fraction of nylon 6 is 8%, and the mass fraction of carbon nanofiber is nylon 6 3wt% of the mass, after being completely dissolved, the spinning solution was obtained, and the spinning solution was subjected to electrospinning and collected on the surface of the receiving plate. The middle layer is electrospun carbon nanofiber / β-cyclodextrin-polyacrylic acid-citric acid nanofiber membrane: dissolve β-cyclodextrin in N,N-dimethylformamide and stir until completely dissolved, in which β-cyclodextrin The mass fraction of β-cyclodextrin is 10wt%; after it is completely dissolved, acidified carbon nanofibers, citric acid, and polyacrylic acid are added to the solution in turn, and stirred until completely dissolved. , 10% and 10%; after being completely dissolved, the spinning solut...

Embodiment 3

[0033]The lower layer is an electrospun carbon nanofiber / polyacrylic acid composite nanofiber membrane: the acidified carbon nanofibers and polyacrylic acid are stirred in N,N-dimethylformamide until uniformly dispersed, and the mass fraction of polyacrylic acid is 8%. The mass of carbon nanofibers is 3wt% of the mass of polyvinyl alcohol. After being completely dissolved, a spinning solution is obtained, which is electrospun and collected on the surface of a receiving plate. The middle layer is electrospun carbon nanofiber / β-cyclodextrin-polyacrylic acid-citric acid nanofiber membrane: dissolve β-cyclodextrin in N,N-dimethylformamide and stir until completely dissolved, in which β-cyclodextrin The mass fraction of β-cyclodextrin is 10wt%; after it is completely dissolved, acidified carbon nanofibers, citric acid, and polyacrylic acid are added to the solution in turn, and stirred until completely dissolved. , 10% and 10%; after being completely dissolved, the spinning solutio...

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Abstract

The invention provides a preparation method of a carbon nanometer fiber / beta-cyclodextrin based nanometer fiber film with a sandwich structure. The method is characterized in that the nanometer fiberfilm employs beta-cyclodextrin as a substrate, citric acid as a cross-linking agent, beta-cyclodextrin as a reinforcing phase, and a polymer for assisting film forming, and is the nanometer fiber filmwith the electrospun carbon nanofiber enhanced polymer / beta-cyclodextrin-polyacrylic acid / polymer three-layer sandwich structure. The nanometer fiber film with the sandwich structure has good adsorption and fixation effects for heavy metal ions (such as Cd(II), Cu(II), Fe(III) metal cations) in aqueous solution. The preparation process has the advantages of simple and easy operation, easily available raw materials, environmental friendliness, and low cost, and the method can be applied to water treatment and biomedical fields which need high efficient separation and fixation of heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of nanometer functional membrane materials, and in particular relates to a preparation method of a sandwich-structured nanofiber membrane and its application in the adsorption and fixation of heavy metal ions. Background technique [0002] Heavy metal elements are widely used in batteries, electroplating, dyes, optoelectronic components and atomic reactors. However, most heavy metals are extremely harmful to human health and are listed as carcinogens. Studies have shown that long-term drinking of water contaminated by heavy metals and eating rice containing heavy metals will cause serious damage to human health. In order to protect water sources, it is particularly urgent to develop advanced treatment technologies for heavy metal ions. [0003] Wastewater treatment technologies containing heavy metal ions generally include chemical precipitation, flocculation-flotation, membrane separation, electrodialysis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/02C02F1/44C02F1/28C02F101/20
CPCB01D67/0079B01D69/02B01D69/125B01D2323/30B01D2323/39B01D2323/40B01D2325/12C02F1/288C02F1/44C02F2101/20C02F2303/16
Inventor 胡银春黄棣张雪荣魏延杜晶晶
Owner TAIYUAN UNIV OF TECH
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