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A preparation method of dopamine-assisted dispersing graphene oxide modified polyvinylidene fluoride ultrafiltration membrane

A polyvinylidene fluoride and graphene modification technology, applied in the field of functional membranes, can solve the problems of low water flux of polyvinylidene fluoride ultrafiltration membranes, unsatisfactory dispersion of graphene oxide, and restrictions on practical applications, etc. The recovery rate and interception rate are improved, the improvement range is large, and the hydrophilic performance is strengthened.

Active Publication Date: 2021-07-30
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The low water flux and poor anti-fouling performance of polyvinylidene fluoride ultrafiltration membrane limit its practical application
Simply using graphene oxide to modify it hydrophilically, the dispersion of graphene oxide in the casting solution is not ideal

Method used

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  • A preparation method of dopamine-assisted dispersing graphene oxide modified polyvinylidene fluoride ultrafiltration membrane
  • A preparation method of dopamine-assisted dispersing graphene oxide modified polyvinylidene fluoride ultrafiltration membrane
  • A preparation method of dopamine-assisted dispersing graphene oxide modified polyvinylidene fluoride ultrafiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In this example, dopamine-assisted dispersion of graphene oxide modified polyvinylidene fluoride ultrafiltration membrane was prepared according to the following steps:

[0030] Step 1, preparation of casting solution

[0031] Add 0.2g of sheet-layer graphene oxide to 81.8g of N,N dimethylacetamide (DMAc) solvent, ultrasonically disperse it for 30min, then slowly add 2g of polyethylene as a pore-forming agent under the condition of magnetic stirring pyrrolidone, and stirred until completely dissolved to obtain a mixed solution; dry the polyvinylidene fluoride particles in a vacuum oven at 60°C for 12 hours, take out and weigh 16g into the mixed solution, and stir magnetically at 60°C for 6 hours to make the polyvinylidene fluoride particles The vinylidene fluoride particles are completely dissolved to obtain a casting solution; the casting solution is left to stand for 12 hours to remove air bubbles;

[0032] Step 2, preparation of polyvinylidene fluoride ultrafiltrati...

Embodiment 2

[0035] This embodiment prepares polyvinylidene fluoride ultrafiltration membrane according to the same method as in Example 1, the difference is that in step 1, 0.2g graphene oxide and 0.2g dopamine are weighed and added to 81.6g N,N dimethylacetamide (DMAc ) in the solvent. The modified polyvinylidene fluoride ultrafiltration membrane prepared in this example is denoted as M2.

Embodiment 3

[0037] This embodiment prepares polyvinylidene fluoride ultrafiltration membrane according to the same method as in Example 1, the difference is that in step 1, 0.2g graphene oxide and 0.4g dopamine are weighed and added to 81.4g N,N dimethylacetamide (DMAc ) in the solvent. The modified polyvinylidene fluoride ultrafiltration membrane prepared in this example is designated as M3.

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Abstract

The invention discloses a preparation method of dopamine-assisted dispersing graphene oxide modified polyvinylidene fluoride ultrafiltration membrane, which is characterized in that: firstly, the stability of graphene oxide in N,N dimethylacetamide is enhanced by adding dopamine properties, and then add polyvinylidene fluoride and polyvinylpyrrolidone to obtain a casting solution; the casting solution is passed through the immersion-precipitation phase inversion method to prepare a dopamine-assisted dispersing graphene oxide polyvinylidene fluoride ultrafiltration membrane. The addition of dopamine in the ultrafiltration membrane prepared by the present invention makes the dispersion of graphene oxide in the casting solution more stable, and the effect of hydrophilic modification is increased, which not only greatly improves the water flux, but also improves the anti-fouling effect. performance.

Description

technical field [0001] The invention relates to a preparation method of an ultrafiltration membrane, in particular to a preparation method of a dopamine-assisted dispersion graphene oxide modified polyvinylidene fluoride ultrafiltration membrane, which belongs to the field of functional membranes. Background technique [0002] Membrane separation technology is a separation technology that has developed rapidly in recent years. Materials used to prepare ultrafiltration membranes include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyethersulfone (PES), polyacrylonitrile (PAN), and the like. PVDF is widely used in the preparation of ultrafiltration membranes because of its strong chemical stability and thermal stability, strong oxidants such as acids and alkalis cannot corrode it at room temperature, and its Td is above 300 °C. However, if it is used as a membrane material alone, it has serious defects, because its surface energy is too low and its hydrop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D67/00B01D61/14
Inventor 周艺峰朱瑶陈鹏鹏聂王焰徐颖
Owner ANHUI UNIVERSITY
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