Preparation method of nano tio2 modified pvdf ultrafiltration membrane

An ultrafiltration membrane and nanotechnology, applied in the field of membrane separation, can solve the problems of shortened membrane life, reduced membrane flux, and high driving force, and achieve the effects of extending membrane life, reducing agglomeration, and reducing energy consumption

Inactive Publication Date: 2011-12-28
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polyvinylidene fluoride (PVDF) is a membrane material with excellent performance, but there are two problems when dealing with aqueous systems: one is the high driving force of mass transfer through the membrane, and the other is that it is used in oil-water separation and protein drugs. In the separation and other aspects, adsorption pollution will occur, which will reduce the membrane flux and shorten the membrane life.

Method used

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  • Preparation method of nano tio2 modified pvdf ultrafiltration membrane
  • Preparation method of nano tio2 modified pvdf ultrafiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh 17g of PVDF and 75g of N,N-dimethylformamide in a beaker, stir well at room temperature until PVDF is completely dissolved; then add 2g of polyvinylpyrrolidone, nano-TiO 2 2g, 4g of sodium lauryl sulfate, stir well until the solid powder is completely dissolved; place the solution in the beaker in an ultrasonic extractor for ultrasonic oscillation at 20KHZ frequency and 2000W power for 5 minutes, and then use a 500-mesh copper mesh to Suction filter the film-making solution to remove solid particles; place the film-making solution in the beaker in a constant temperature box at 0-3°C for 24 hours for defoaming, and scrape the degassed film-making solution with a flat-plate scraper with a scraper. A liquid film of a certain thickness (requirement: the scraper must be absolutely dry, clean, and free of impurities); after standing in the air for 30 seconds, the scraper and the liquid film are immersed in a 25-degree coagulation bath (60-75% ethanol aqueous solution), ...

Embodiment 2

[0028] Weigh 16g of PVDF and 75g of N,N-dimethylformamide in a beaker, stir well at room temperature until PVDF is completely dissolved; then add 2g of porogen polyvinylpyrrolidone, nano-TiO 2 3g, sodium lauryl sulfate 4g, stir well until the solid powder is completely dissolved; place the solution in the beaker in an ultrasonic extractor for ultrasonic oscillation and act on it for 4 minutes at a frequency of 20KHZ and a power of 2000W, and then use a 500-mesh copper mesh to Suction filter the film-making solution to remove solid particles; place the film-making solution in the beaker in a constant temperature box at 0-3°C for 24 hours for defoaming, and scrape the degassed film-making solution with a flat-plate scraper with a scraper. A liquid film of a certain thickness (requirement: the scraper must be absolutely dry, clean, and free of impurities); after standing in the air for 30 seconds, the scraper and the liquid film are immersed in a 20-degree coagulation bath (60-75%...

Embodiment 3

[0030] Weigh 16g of PVDF and 74g of N, N-dimethylformamide in a beaker, stir well at room temperature until PVDF is completely dissolved; then add porogen 2g of polyvinylpyrrolidone, nano-TiO 2 4g, sodium lauryl sulfate 4g, stir well until the solid powder is completely dissolved; place the solution in the beaker in an ultrasonic extractor for ultrasonic oscillation and act on it for 6 minutes at 20KHZ frequency and 2000W power, and then use a 500-mesh copper mesh to Suction filter the film-making solution to remove solid particles; place the film-making solution in the beaker in a thermostat at 0-3°C for 24 hours for defoaming, and scrape the degassed film-making solution with a flat-plate scraper with a scraper. A liquid film of a certain thickness (requirement: the scraper must be absolutely dry, clean, and free of impurities); after standing in the air for 30 seconds, the scraper and the liquid film are immersed in a 30-degree coagulation bath (60-75% ethanol water solutio...

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Abstract

The invention relates to a preparation method of a nano TiO2-modified PVDF (Polyvinylidene Fluoride) ultrafiltration membrane. The preparation method comprises the following steps of: preparing a membrane making liquid from 15-20 percent by mass of PVDF, 1-3 percent of pore-foaming agent, 1-4 percent of nano TiO2, 3-5 percent of surfactant and 70-80 percent of solvent, ultrasonically oscillating the membrane making liquid for 5-10 minutes, leaching and defoaming; scraping with a membrane scraping machine to form a liquid membrane, standing in the air for 20-60 seconds, soaking into a coagulation bath and coagulating the liquid membrane into an ultrafiltration membrane; and after the ultrafiltration membrane falls off, taking the ultrafiltration membrane out, soaking into distilled water and cutting according to required size for later use. A nano TiO2 hydrophilic monomer is arranged on the surface of the PVDF ultrafiltration membrane, sodium dodecyl sulfate serving as a surfactant is used simultaneously, and dispersion is performed by ultrasonically oscillating, so that agglomeration of nano TiO2 is reduced, nano TiO2 is quickly and uniformly distributed into the membrane making liquid, the hydrophilicity of the PVDF ultrafiltration membrane is enhanced effectively, the energy consumption is enhanced greatly, the anti-pollution capacity and pollutant intercepting performance of the membrane are enhanced, and the service life of the membrane is prolonged.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a nano-TiO 2 A preparation method of a modified polyvinylidene fluoride (PVDF) ultrafiltration membrane. Background technique [0002] With the continuous development of society and the improvement of people's living standards, a healthy living environment has increasingly become the pursuit of human beings. With the development of ultrafiltration membrane technology, people put forward various characteristic requirements for ultrafiltration membranes, among which, it becomes more and more urgent to solve the pollution problem on the membrane surface. The modification of ultrafiltration membrane, especially the introduction of hydrophilic groups on the membrane surface is the key to solve the problem. In the research on the fouling of ultrafiltration membranes, it is found that improving the hydrophilicity of the membrane surface is conducive to improving the anti-f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D67/00
Inventor 竺柏康王北福聂立宏张华文李翠翠
Owner ZHEJIANG OCEAN UNIV
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