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A new method for the preparation of chitosan nanofiber-based composite filter membrane

A chitosan nano- and nano-fiber technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as difficulty in controlling the thickness of the functional cortex, hindering the large-scale use of nanofiber composite membranes, and seepage of casting liquid. , to achieve the effect of simple preparation method, easy large-scale production and environmental friendliness

Inactive Publication Date: 2018-06-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As far as the two commonly used methods of coating and interfacial polymerization are concerned, two problems cannot be avoided in the process of preparing composite membranes: one is the problem of infiltration of the casting liquid when coating and manufacturing the functional skin layer, and the other is the infiltration of the functional skin layer. Thickness difficult to control
These technical issues have seriously hindered the large-scale use of nanofibrous composite membranes.

Method used

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  • A new method for the preparation of chitosan nanofiber-based composite filter membrane
  • A new method for the preparation of chitosan nanofiber-based composite filter membrane

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Effect test

Embodiment 1

[0029] A new method for preparing chitosan nanofiber-based composite filter membrane, the specific steps are:

[0030] (1) polyacrylonitrile (PAN) (M w =120,000g / mol, Jinshan Petrochemical) 10g was dissolved in N,N-dimethylformamide (DMF) solvent 90g to obtain a transparent and uniform electrospinning solution;

[0031] (2) Chitosan (CS) (viscosity-average molecular weight 400cps, degree of deacetylation 85.5%, Jinan Haidebei Marine Biological Engineering Co., Ltd.) and polyethylene oxide (PEO) (Mv=1,000,000g / mol, Aldrich) according to The mass ratio of 9:1 was mixed and dissolved in 3wt% acetic acid aqueous solution to prepare a solution with a total mass fraction of 1wt%, and a certain amount of UV-crosslinkable monomer triethylene glycol dimethacrylate ( TEGDMA), the mass ratio of chitosan (CS) and triethylene glycol dimethacrylate (TEGDMA) is 1: 0.5, stirs evenly, obtains the transparent uniform electrostatic spray solution;

[0032] (3) Add the electrospinning solution ...

Embodiment 2-5

[0037] Adopt the preparation method similar to the chitosan nanofiber-based composite filter membrane in embodiment 1, difference is, in described step (2), chitosan (CS) and triethylene glycol dimethacrylic acid The mass ratios of the esters (TEGDMA) are 1:0, 1:1, 1:1.5, 1:2, respectively.

[0038] The CS-PEO-PEGDMA / PAN nanofiber base composite filter membrane prepared in embodiment 1-5 carries out dead-end filtration test to the acid dye direct red 80 of 100ppm: when chitosan (CS) and triethylene diethylene glycol When the mass ratio of alcohol dimethacrylate (TEGDMA) is 1: 0, 1: 0.5, 1: 1, 1: 1.5, and 1: 2, the prepared chitosan nanofiber-based composite filter membrane is used for 100ppm The acid dye Direct Red 80 was tested for dead-end filtration, the filtration operating pressure was 0.2MPa, and the corresponding permeation fluxes were 81.4, 117.5, 85.6, 77.2, 59.7L / m 2 h, the rejection rates were 93.2%, 99.9%, 99.8%, 99.5%, and 99.7%, respectively. It can be found th...

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Abstract

The invention provides a novel method for preparing a chitosan nanofiber-base composite filter membrane. The method comprises the steps that a polymer material is dissolved in a solvent to be prepared into an electrostatic spinning solution; chitosan and spinning-assisting macromolecules are dissolved in the solvent according to the certain mass ratio, a certain number of monomers capable of achieving ultraviolet light crosslinking are added, and the mixture is stirred to be uniform to obtain an electrostatic spraying solution; the electrostatic spraying solution is subjected to electrostatic spinning to obtain a nanofiber non-woven fabric supporting layer; the electrostatic spraying solution is sprayed to the nanofiber non-woven fabric supporting layer through an electrostatic spraying method to form a function blocking layer, then hot-press incipient fusion treatment is carried out, ultraviolet light crosslinking and curing treatment is carried out, and therefore the chitosan nanofiber-base composite filter membrane is obtained. The chitosan nanofiber-base composite filter membrane is prepared by combining the hot-press incipient fusion method with ultraviolet light crosslinking aftertreatment, no traditional chemical crosslinking agent is adopted, light energy is sufficiently utilized, energy conservation and environment protection are achieved, and the prepared chitosan nanofiber-base composite filter membrane can efficiently treat acid dye wastewater for a long time.

Description

technical field [0001] The invention belongs to the field of preparation of separation composite membranes, in particular to a new method for preparing chitosan nanofiber-based composite membranes for treating acid dye wastewater. Background technique [0002] Dyes are widely used in industries such as textiles, papermaking, plastics, leather, food, and cosmetics as dyeing agents for related products. Among them, acid dyes are a class of water-soluble dyes with acidic groups in their structure. Most of them contain Water-soluble groups such as sulfonic acid groups and carboxyl groups. The consumption of acid dyes in the world is second only to sulfur, direct and disperse dyes, and dye molecules usually contain a benzene ring structure, stable physical and chemical properties, and difficult to degrade. As a result, thousands of tons of acid dye wastewater discharged will cause serious toxic pollution to the environment. At present, the technologies used for the separation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/42B01D69/12B01D67/00C02F1/44
CPCB01D67/0006B01D69/12B01D71/42B01D2323/30B01D2323/345C02F1/44C02F2103/30
Inventor 王雪芬华韦康神领弟王敏程诚
Owner DONGHUA UNIV
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