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Preparation method of gradient cross-linked zwitterion-modified multilayer composite nanofiltration membrane and application of composite nanofiltration membrane

A zwitterion, multi-layer composite technology, applied in the field of composite membranes, can solve the problems of environmental pollution, waste of resources, dye wastewater cannot be directly reused, etc., to improve the retention rate, easy operation, improve water flux and salt permeation. rate effect

Active Publication Date: 2022-07-05
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, a certain amount of inorganic salt is generally added to the dyeing process to increase the dye uptake rate, but the presence of inorganic salt will cause the dye wastewater to not be reused directly, and if it is discharged directly without treatment, it will bring Serious environmental pollution and waste of resources

Method used

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  • Preparation method of gradient cross-linked zwitterion-modified multilayer composite nanofiltration membrane and application of composite nanofiltration membrane
  • Preparation method of gradient cross-linked zwitterion-modified multilayer composite nanofiltration membrane and application of composite nanofiltration membrane
  • Preparation method of gradient cross-linked zwitterion-modified multilayer composite nanofiltration membrane and application of composite nanofiltration membrane

Examples

Experimental program
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Effect test

preparation example Construction

[0035] On the overall design, the preparation method of this embodiment includes the following steps:

[0036] Step a. Put the polyacrylonitrile ultrafiltration membrane into the sodium hydroxide solution, heat treatment at 50 ° C, rinse the membrane surface with distilled water after heat treatment to obtain a hydrolyzed polyacrylonitrile ultrafiltration membrane, and heat the hydrolyzed polyacrylonitrile ultrafiltration membrane. The filter membrane is fixed in the ultrafiltration cup;

[0037] Step b. Add glutaraldehyde and sodium dodecyl sulfate into water to prepare a mixed solution at room temperature, and soak the surface of the hydrolyzed polyacrylonitrile ultrafiltration membrane fixed in step a with the prepared mixed solution, and after the soaking is completed Pour out the mixed solution, and dry the membrane soaked in the mixed solution;

[0038] Step c. Prepare an amphoteric polyethyleneimine solution at room temperature, soak the film after drying in step b wit...

example 1

[0050] In the preparation process of this example, the polyacrylonitrile ultrafiltration membrane was first put into 1 mol / L sodium hydroxide solution, and the temperature was controlled to be 50 °C for heat treatment for 1 h, and then the surface of the membrane was washed with distilled water to obtain a hydrolyzed polyacrylonitrile ultrafiltration membrane. And fix the membrane on the ultrafiltration cup. Next, at room temperature, the crosslinking agent glutaraldehyde and the active agent sodium dodecyl sulfate are added to water to prepare a mixed solution. The mass concentration of glutaraldehyde in the mixed solution is 0.52%, and the mass concentration of sodium dodecyl sulfate is 0.15%, and poured the prepared mixed solution on the surface of the fixed hydrolyzed polyacrylonitrile ultrafiltration membrane, soaked for 10 min, poured out the solution, and dried the membrane.

[0051] Then, 2 g of polyethyleneimine and 4 g of zwitterion methacryloylethyl sulfobetaine wer...

example 2

[0057] In the preparation process of this example, the concrete steps are basically the same as Example 1, the difference is only that in the mixed solution of the prepared cross-linking agent glutaraldehyde and the active agent sodium dodecyl sulfate, the mass concentration of glutaraldehyde is 0 %, that is, the mixed solution with the crosslinking agent glutaraldehyde and the active agent sodium lauryl sulfate is not used in this example, the soaking time of the amphoteric polyethyleneimine solution is 20min, and the stirring coating of the tannic acid solution is used. The time is 0 min, that is, the stirring coating of the tannic acid solution is not carried out in this example.

[0058] figure 2 The surface infrared characterization diagram of the composite nanofiltration membrane obtained in this example is shown by figure 2 Can be seen at 1036cm -1 The vibrational absorption peaks of the grafted zwitterionic sulfonate on PEI appeared at , which indicated that the zw...

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Abstract

The invention provides a preparation method of a gradient cross-linked zwitterion-modified multilayer composite nanofiltration membrane. The preparation method includes obtaining a hydrolyzed polyacrylonitrile ultrafiltration membrane with a polyacrylonitrile ultrafiltration membrane, and placing the ultrafiltration membrane in an ultrafiltration cup. The membrane is soaked with a mixed solution of glutaraldehyde and sodium lauryl sulfate, and an amphoteric polyethyleneimine solution in turn, and then the membrane is stirred and coated with the prepared tannic acid solution, and then the membrane is compressed by pressure filtration to obtain a gradient Cross-linked zwitterion-modified multilayer composite nanofiltration membranes. The present invention also provides the application of using the obtained composite nanofiltration membrane as a salt and dye separation membrane. The preparation method of the invention is simple and convenient, the membrane surface has a hydrophilic, loose and cross-linked separation layer, and the prepared membrane material is used for the separation of salt and dye, and has better water flux, dye retention rate and salt transmittance.

Description

technical field [0001] The invention relates to the technical field of composite membranes, in particular to a gradient cross-linked zwitterion-modified multilayer composite nanofiltration membrane, and at the same time, the invention also relates to the application of the composite nanofiltration membrane. Background technique [0002] With the rapid development of the printing and dyeing and textile industries, the production and usage of various dyes have increased year by year, thereby realizing the separation of dyes and salts to reduce environmental pollution and realize dye resource utilization, which has become the key to solving the environmental pollution of printing and dyeing wastewater. one of the problems. In the prior art, a certain amount of inorganic salts are generally added in the dyeing process to improve the dyeing rate, but the existence of inorganic salts will cause the dye wastewater to be directly reused, and if it is directly discharged without trea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D69/12B01D69/02B01D67/00B01D61/00C02F1/44C02F103/30
CPCB01D71/82B01D69/02B01D69/125B01D67/0006B01D61/027C02F1/442B01D2325/02B01D2325/36C02F2103/30Y02A20/131
Inventor 刘冠华郭亚伟孙天逸杨浩然崔贺李子瑜张敏姜艳军高静
Owner HEBEI UNIV OF TECH
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