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Preparation method of a solvent-resistant charged composite nanofiltration membrane

A composite nanofiltration membrane and solvent-resistant technology, applied in the field of composite materials, can solve the problems that the performance needs to be further improved, the composite structure has less solvent-resistant nanofiltration membranes, etc., and achieves improved solvent resistance, good swelling resistance, and high retention rate. Effect

Active Publication Date: 2022-01-25
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to reports, there have been many studies on the preparation of nanofiltration / reverse osmosis membranes by interfacial polymerization using aromatic polyacyl chlorides and polyamines as reactive monomers, but there are relatively few reports on composite structure solvent-resistant nanofiltration membranes. And the performance needs to be further improved

Method used

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  • Preparation method of a solvent-resistant charged composite nanofiltration membrane
  • Preparation method of a solvent-resistant charged composite nanofiltration membrane
  • Preparation method of a solvent-resistant charged composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Dissolution of Kevlar aromatic polyamide fiber

[0031] Dissolve 2.0 g of strong base KOH in 40 g of a mixed solvent of dimethyl sulfoxide (DMSO): water (40:1 by volume). Add 2.0 grams of Kevlar aromatic polyamide fiber to the above solution, and then mechanically stir for 2 weeks at room temperature to destroy a large number of hydrogen bonds between the carbonyl and amide groups between the molecules until its color becomes a uniform dark red nanofiber solution . The obtained nanofiber solution was left to stand for 30 days to further hydrolyze the amide into short polymer chain segments to obtain an amino group-containing nanofiber dispersion, in which the molecular chain length of the nanofibers was tested to be 15-65nm.

[0032] (2) Preparation of ion-pair structure ionic liquid monomer

[0033] 6.52g NaHCO 3 Add 124mL of water / acetone (1:1, v / v) mixed solvent into a round bottom flask. After dissolving, 16.9g of imidazole and 62.33mg of hydroquinone were ad...

Embodiment 2

[0049] In embodiment 1 step (5), the mass concentration 1.0wt% of GO-[VBzImIBa][Br] is changed to 1.5wt%, and other conditions remain unchanged. A composite structure solvent-resistant nanofiltration membrane with a thickness of 129 μm was obtained. Using the performance testing method described in Example 1, the solvent resistance of the nanofiltration membrane is shown in Table 2. The permeation flux of each solvent is arranged in the following order: acetone>ethyl acetate>methanol>ethanol>DMF>n-hexane. Among them, acetone has the highest flux of 15.6L m –2 h –1 bar –1 , the flux of n-hexane is the lowest at 1.9Lm –2 h –1 bar –1 . The solvent-resistant composite nanofiltration membrane has a rejection rate of 98.6% for Janus Green in ethanol solution, 97.8% for Erythrosin EB, 92.9% for Patent Blue VF, and 92.9% for Methyl Orange. The rate is 53.6%.

[0050] Table 2 Swellability of solvent-resistant nanofiltration membranes before and after solvent immersion

[0051...

Embodiment 3

[0053] In step (5) of Example 1, the mass concentration of GO-[VBzImIBa][Br] was changed from 1.0wt% to 2.0wt%, and other conditions remained unchanged. A composite structure solvent-resistant nanofiltration membrane with a thickness of 131 μm was obtained. Using the performance test method described in Example 1, the solvent resistance of the nanofiltration membrane is shown in Table 3. The permeation flux of each solvent is arranged in the following order: acetone>ethyl acetate>methanol>ethanol>DMF>n-hexane. Among them, acetone has the highest flux of 16.5L m –2 h –1 bar –1 , the flux of n-hexane is the lowest at 2.1Lm –2 h –1 bar –1 . The solvent-resistant composite nanofiltration membrane has a rejection rate of 98.8% for Janus Green in ethanol solution, 97.4% for Erythrosin EB, 92.4% for Patent Blue VF, and 92.4% for Methyl Orange. The rate is 53.3%.

[0054] Table 3 Swellability of solvent-resistant nanofiltration membranes before and after solvent immersion

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Abstract

A preparation method of a solvent-resistant charged composite nanofiltration membrane, comprising: (1) polyparaphenylene terephthalamide undergoes amide hydrolysis to obtain a nanofiber dispersion containing amino groups; (2) passing The esterification reaction anchors the initiator 2-bromo-2-methylpropionyl bromide to obtain graphene oxide containing a bromine group; then the ion-pair structure ionic liquid with the structure as shown in formula (III) is used as a monomer, and is passed through ARGET ‑ATRP grows polymers on graphene oxide containing bromine groups to obtain ion-pair structure ionic liquid functionalized graphene oxide; (3) mix the nanofiber dispersion containing amino groups with the ion-pair structure ion prepared in step (2) The liquid functionalized graphene oxide is formulated into a casting solution; (4) the casting solution is formed into a film-like colloid on a clean glass plate, immersed in deionized water to form a film, and then subjected to heat treatment to obtain a charged solvent-resistant composite nanofiltration membrane. The composite nanofiltration membrane of the invention has good solvent resistance and high flux in organic solvents.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a preparation method of a solvent-resistant charged composite nanofiltration membrane, and belongs to the field of membrane technology. Background technique [0002] Nanofiltration membrane has the characteristics of nano-scale pore size, low operating pressure, different selectivity to monovalent and divalent ions, and high retention of small molecular organic matter. It has been widely used in water treatment, textile printing and dyeing, papermaking, Food, medicine, petrochemical and biochemical fields (Chinese Journal of Chemical Engineering 25(2017) 1639–1652; Journal of Water Process Engineering 19(2017) 164–171). [0003] Nanofiltration membranes are mainly divided into inorganic nanofiltration membranes and organic nanofiltration membranes. Inorganic nanofiltration membranes have good solvent resistance, but are relatively expensive. At present, organic nanofiltration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D61/02B01D69/12C02F1/44C02F101/30
CPCB01D67/0079B01D69/125B01D61/027B01D69/12C02F1/442C02F2101/308
Inventor 廖俊斌阮文祥杜宝山魏华
Owner ZHEJIANG UNIV OF TECH
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