Aramid loose nanofiltration membrane as well as preparation method and application thereof

A technology of nanofiltration membrane and aramid fiber, which is applied in the field of membrane separation, can solve the problems of high operating pressure, low dye purity, and high energy consumption of nanofiltration membranes, and achieve significant interception effect, low salt interception rate, and simple preparation method.

Active Publication Date: 2021-04-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the nanofiltration membrane has a certain ability to intercept salt ions, the purity of the recovered dye is low
At the same time, the operating pressure of the existing nanofiltration membrane is relatively high, and there may be problems such as excessive energy consumption during the separation process of contaminated salt

Method used

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  • Aramid loose nanofiltration membrane as well as preparation method and application thereof
  • Aramid loose nanofiltration membrane as well as preparation method and application thereof
  • Aramid loose nanofiltration membrane as well as preparation method and application thereof

Examples

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Embodiment 1

[0027] This embodiment provides a method for preparing an aramid loose nanofiltration membrane, comprising the following steps:

[0028] 1) Preparation of aramid nanofiber spinning solution: Soak 1g of para-aramid fiber in 200mL of 1% potassium hydroxide solution, stir at 80°C for 2h, wash with deionized water and dry Add the dried fiber fragments to 500mL of dimethylformamide, and continue to stir at a speed of 200rpm for 3h to obtain the aramid fiber spinning solution;

[0029] 2) Preparation of hydrophilic aramid fiber sol: add the aramid nanofiber spinning solution obtained in step 1) dropwise into a phosphoric acid solution with a mass fraction of 3% according to the dosage ratio of 1g:1000mL, let stand for 12h, and continue Stirring at a speed of 300rpm for 1h, and then ultrasonically treating for 2h to obtain a hydrophilic aramid nanofiber sol;

[0030] 3) Preparation of aramid loose nanofiltration membrane: take a certain mass of the hydrophilic aramid nanofiber sol o...

Embodiment 2

[0032] This embodiment provides a method for preparing an aramid loose nanofiltration membrane, comprising the following steps:

[0033] 1) Preparation of aramid nanofiber spinning solution: Soak 1 g of para-aramid fiber in 400 mL of 1% potassium hydroxide solution, stir at 80°C for 1 h, wash with deionized water and dry Add the dried fiber fragments to 800mL of dimethylformamide, and continue to stir at a speed of 500rpm for 2h to obtain the aramid fiber spinning solution;

[0034] 2) Preparation of hydrophilic aramid fiber sol: add the aramid nanofiber spinning solution obtained in step 1) dropwise into a phosphoric acid solution with a mass fraction of 5% according to the dosage ratio of 1g:2000mL, let stand for 8h, and continue Stirring at a speed of 100rpm for 2h, and then ultrasonically treating for 5h to obtain a hydrophilic aramid nanofiber sol;

[0035] 3) Preparation of aramid loose nanofiltration membrane: take a certain mass of the hydrophilic aramid nanofiber sol...

Embodiment 3

[0037] This embodiment provides a method for preparing an aramid loose nanofiltration membrane, comprising the following steps:

[0038] 1) Preparation of aramid nanofiber spinning solution: Soak 1 g of para-aramid fiber in 400 mL of 1% potassium hydroxide solution, stir at 80°C for 1 h, wash with deionized water and dry Add the dried fiber fragments to 300mL of dimethylformamide, and continue to stir at a speed of 3500rpm for 1h to obtain the aramid fiber spinning solution;

[0039] 2) Preparation of hydrophilic aramid fiber sol: add the aramid nanofiber spinning solution obtained in step 1) dropwise into a phosphoric acid solution with a mass fraction of 10% according to the dosage ratio of 1g:3000mL, let stand for 12h, and continue Stir at a speed of 200rpm for 1.5h, and then ultrasonically treat for 3.5h to obtain a hydrophilic aramid nanofiber sol;

[0040] 3) Preparation of aramid loose nanofiltration membrane: take a certain mass of the hydrophilic aramid nanofiber sol...

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Abstract

The invention provides an aramid loose nanofiltration membrane for efficient dye-salt separation as well as a preparation method and application thereof. The method comprises the following steps: crushing para-aramid fiber yarns, then carrying out alkali treatment, dropwise adding an obtained aramid nanofiber spinning solution into a phosphoric acid solution, performing standing, stirring and ultrasonic treatment, and carrying out ice-bath ultrasonic treatment on the obtained hydrophilic aramid nanofiber sol and Ti3C2Tx two-dimensional nanosheets under an alkaline condition to obtain the aramid loose nanofiltration membrane. The preparation of the membrane is based on the spatial characteristic of three-dimensional interconnection of an aramid fiber skeleton, so that the membrane has the characteristic of high porosity, and further has the separation characteristic and good self-cleaning capability of a nanofiltration membrane. The membrane is used for efficiently recovering dyes afterdye-salt separation, realizes efficient separation and interception of dyes such as Congo red, rose-bengal and alcian blue by utilizing the screening performance of the aramid fiber skeleton after rigid two-dimensional nanosheet intercalation and a reconstructed nano water channel under low pressure, and is suitable for rapid treatment and dye recovery of high-salt printing and dyeing wastewater.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an aramid loose nanofiltration membrane used for high-efficiency dyed-salt separation and its preparation method and application. Background technique [0002] At present, problems such as high salt content and difficulty in direct biological treatment of wastewater from the printing and dyeing industry in my country have become bottlenecks restricting the efficient treatment of wastewater from the printing, dyeing and textile industry. Ozone oxidation and other technologies may produce toxic and harmful by-products in the process of treating such water bodies, causing secondary pollution. Technologies such as ion exchange and electrodialysis have poor separation effects on organic matter and salt in water, and have high energy consumption and poor stability. They are not suitable for large-scale printing and dyeing wastewater treatment. Seeking the remov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/56C02F1/44C02F101/30
CPCB01D61/027B01D67/0079B01D69/02B01D71/56B01D2325/24B01D2325/36C02F1/442C02F2101/308
Inventor 王志伟李洋王雪野
Owner TONGJI UNIV
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