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Preparation method of PVDF/ZrO2-PVA modified ultrafiltration membrane

An ultrafiltration membrane and modification technology, which is applied in the field of membrane materials, can solve the problems of deterioration of membrane separation characteristics, influence on separation effect, decrease of membrane flux, etc., achieve excellent hydrophilicity and anti-pollution performance, improve treatment efficiency, reduce Effect of Surface Roughness

Inactive Publication Date: 2020-04-14
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Membrane fouling is the main restrictive factor in the application of membrane technology in water treatment. In the process of ultrafiltration membrane separation, membrane fouling will not only directly cause the decrease of membrane flux and affect the separation effect, but also cause the deterioration of membrane separation characteristics after long-term operation. , resulting in a shortened membrane life

Method used

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  • Preparation method of PVDF/ZrO2-PVA modified ultrafiltration membrane
  • Preparation method of PVDF/ZrO2-PVA modified ultrafiltration membrane
  • Preparation method of PVDF/ZrO2-PVA modified ultrafiltration membrane

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Effect test

Embodiment 1

[0027] A PVDF / ZrO 2 -The preparation method of PVA modified ultrafiltration membrane, comprises the following steps:

[0028] (1) Take 15g of PVDF, 28g of PVA and 1g of ZrO 2 Dissolve 73g of dimethylacetamide (DMAc) solution, then add 5g porogen polyvinylpyrrolidone PVP+LiCl, and then bathe in water;

[0029] (2) Put the casting solution in a water bath at a temperature of 58-62°C and stir, first stir at a speed of 600r / min for 1h, then stir at a speed of 90r / min for 5h, then let it stand at room temperature for 30min, and put it in a vacuum drying oven for 60 Dry at ℃ for 6h;

[0030] (3) After scraping off the ultrafiltration membrane with a film thickness of 200um at room temperature, immediately immerse it in a 20% ethanol aqueous coagulation bath.

Embodiment 2

[0032] A PVDF / ZrO 2 -The preparation method of PVA modified ultrafiltration membrane, comprises the following several steps:

[0033] (1) Take 15g of PVDF, 24g of PVA and 1g of ZrO 2 Dissolve 73g of dimethylacetamide (DMAc) solution, then add 5g porogen polyvinylpyrrolidone PVP+LiCl, and then bathe in water;

[0034] (2) Put the casting solution in a water bath at a temperature of 58-62°C and stir, first stir at a speed of 600r / min for 1h, then stir at a speed of 90r / min for 5h, then let it stand at room temperature for 30min, and put it in a vacuum drying oven for 60 Dry at ℃ for 6h;

[0035] (3) After scraping off the ultrafiltration membrane with a film thickness of 200um at room temperature, immediately immerse it in a 20% ethanol aqueous coagulation bath.

Embodiment 3

[0037] A PVDF / ZrO 2 -The preparation method of PVA modified ultrafiltration membrane, comprises the following several steps:

[0038] (1) Take 15g of PVDF, 24g of PVA and 1g of ZrO 2 Dissolve 73g of dimethylacetamide (DMAc) solution, then add 5g porogen polyvinylpyrrolidone PVP+LiCl, and then bathe in water;

[0039] (2) Put the casting solution in a water bath at a temperature of 58-62°C and stir, first stir at a speed of 600r / min for 1h, then stir at a speed of 90r / min for 5h, then let it stand at room temperature for 30min, and put it in a vacuum drying oven for 60 Dry at ℃ for 6h;

[0040] (3) After scraping off the ultrafiltration membrane with a film thickness of 200um at room temperature, immediately immerse it in a 20% ethanol aqueous coagulation bath.

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Abstract

The invention provides a preparation method of a PVDF / ZrO2-PVA modified ultrafiltration membrane. The preparation method comprises the following steps: (1) dissolving ZrO2 in dimethylacetamide (DMAC),carrying out ultrasonic dispersion, and adding PVDF, a pore-foaming agent polyvinylpyrrolidone (PVP), lithium chloride (LiCl) and polyvinyl alcohol (PVA); (2) stirring the membrane casting solution in a water bath at a certain temperature for a period of time, standing at room temperature, and putting into a vacuum drying oven; and (3) scraping the membrane at room temperature, and immediately immersing in a coagulating bath. According to the preparation method disclosed by the invention, the body performance of the PVDF membrane can be completely reserved, the modification operation is simple, the cost is low, the modified PVDF ultrafiltration membrane has excellent hydrophilicity and excellent anti-pollution performance, has the improved mechanical strength due to the doping of nano ZrO2, and is suitable for complex liquid phase separation systems under extreme conditions, and the environmental adaptability and the treatment efficiency of the ultrafiltration membrane technology water purification process are substantially improved.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a PVDF / ZrO 2 -The preparation method of PVA modified ultrafiltration membrane. Background technique [0002] Membrane fouling is the main restrictive factor in the application of membrane technology in water treatment. In the process of ultrafiltration membrane separation, membrane fouling will not only directly cause the decrease of membrane flux and affect the separation effect, but also cause the deterioration of membrane separation characteristics after long-term operation. , resulting in shortened membrane life. In the process of using membrane separation technology to treat wastewater, there are many factors that affect the effect of membrane separation, among which the nature of feed liquid is an important factor for membrane fouling. [0003] Zirconia (ZrO 2 ) As a special transition metal oxide, it has acid-base amphotericity, is an n-type semiconductor, ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/34B01D71/38B01D71/02B01D69/02B01D67/00
CPCB01D67/0079B01D69/02B01D71/024B01D71/34B01D71/38B01D71/82B01D2325/24B01D2325/36
Inventor 杨亚红刘恩露李雨薇芦婉蒙林秀锋杨兴峰
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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