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Preparation method for graphene oxide/polyvinylidene fluoride composite ultrafiltration membrane

A polyvinylidene fluoride and graphene technology, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve the problems of poor hydrophilicity and poor anti-fouling properties, and achieve strong anti-fouling properties, low production costs, and affinity good water effect

Inactive Publication Date: 2012-09-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of poor hydrophilicity and poor antifouling property of existing polyvinylidene fluoride ultrafiltration membranes, and provides a preparation method of graphene oxide / polyvinylidene fluoride composite ultrafiltration membranes

Method used

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  • Preparation method for graphene oxide/polyvinylidene fluoride composite ultrafiltration membrane
  • Preparation method for graphene oxide/polyvinylidene fluoride composite ultrafiltration membrane
  • Preparation method for graphene oxide/polyvinylidene fluoride composite ultrafiltration membrane

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specific Embodiment approach 1

[0018] Specific embodiment one: the preparation method of a kind of graphene oxide / polyvinylidene fluoride composite ultrafiltration membrane in this embodiment is carried out according to the following steps:

[0019] 1. At a temperature of 20~24°C, weigh N-methylpyrrolidone and graphene oxide into a three-necked bottle according to the ratio of mass ratio (81~85):1, and ultrasonicate under the condition of 240~260W 1.8~2.2h, then according to the mass ratio of graphene oxide, polyvinylpyrrolidone and polyvinylidene fluoride in the ratio of 1:1:(14~18), respectively weigh polyvinylpyrrolidone and polyvinylidene fluoride into the three-necked bottle , put the three-neck flask in a water bath at a temperature of 42-48°C, keep the rotation speed at 400-600rpm and continue stirring for 11-13 hours to obtain the casting solution;

[0020] 2. Put the casting solution prepared in step 1 on a clean glass plate. The thickness of the coating film set by the film applicator is 140~160μm...

specific Embodiment approach 2

[0027] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the graphene oxide described in step one is prepared according to the following steps:

[0028] 1. Weigh flake graphite, sodium nitrate and potassium permanganate respectively according to the ratio of mass ratio (1.2~1.5):1:(8~10), then add flake graphite and sodium nitrate to the Put it into a three-necked flask and put it into an ice-water bath to cool to 0~5°C, and pour it into the three-necked flask according to the ratio of the sum of the mass of flake graphite and sodium nitrate to the volume of concentrated sulfuric acid: 1g: (40~50) mL Add concentrated sulfuric acid with a mass fraction of 98%, and add 2 / 3 parts of the above-mentioned potassium permanganate under the condition that the stirring speed is 2500~3000rpm and the temperature is 6~8°C. The whole process of adding potassium permanganate continues 0.8~1.2h, then put it in an ice-water bath, keep the rotation ...

specific Embodiment approach 3

[0031] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that in step 1, at a temperature of 21-23°C, N- Add methylpyrrolidone and graphene oxide into the three-necked flask. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invnetion provides a preparation method for a graphene oxide / polyvinylidene fluoride composite ultrafiltration membrane and relates to the preparation method of the graphene oxide / polyvinylidene fluoride composite ultrafiltration membrane. The invention aims to solve the problem of poor hydrophilicity and stain resistance of the existing polyvinylidene fluoride ultrafiltration membrane. The method provided by the invention comprises the following steps of: 1. respectively adding graphene oxide, polyvinylpyrrolidone and polyvinylidene fluoride with N-methylpyrrolidone as solvent, heating and stirring to obtain casting membrane solution; 2. putting the casting membrane solution on a clean glass plate and scrapping to a certain thickness by a coating device, and then immersing distilled water, shedding and drying to obtain the graphene oxide / polyvinylidene fluoride composite ultrafiltration membrane. The preparation method provided by the invention can be applied to the fields of drinking water preparation, food industry, pharmaceutical industry, biotechnology, chemical process and environmental engineering.

Description

technical field [0001] The invention relates to a preparation method of a graphene oxide / polyvinylidene fluoride composite ultrafiltration membrane. Background technique [0002] Ultrafiltration is an important membrane separation technology, which has been widely used in many fields such as drinking water preparation, food industry, pharmaceutical industry, biotechnology, chemical process and environmental engineering. In ultrafiltration membrane separation technology, the core is the preparation of ultrafiltration membrane. Ultrafiltration membranes are generally made of organic polymer materials, commonly used are cellulose and cellulose derivatives, polysulfone (PS), polyethersulfone (PES), polyvinylidene fluoride (PVDF), polyamide (PA) and polyacrylonitrile (PAN). Among them, polyvinylidene fluoride (PVDF) is a typical polymer material for preparing ultrafiltration separation membranes. It has heat and radiation resistance, excellent chemical corrosion resistance, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D61/18
Inventor 邵路程喜全刘洋丁善刚黄一峰全帅
Owner HARBIN INST OF TECH
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