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TiO2/C hybrid aerogel modified polyvinylidene fluoride membrane and preparation method thereof

A technology of polyvinylidene fluoride membrane and polyvinylidene fluoride, applied in the field of membrane separation

Inactive Publication Date: 2014-10-29
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Aiming at the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a TiO2 / C hybrid gas The gel-modified polyvinylidene fluoride membrane and its preparation method should solve the technical problems of poor hydrophilicity and anti-pollution performance of the polyvinylidene fluoride membrane in the prior art

Method used

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  • TiO2/C hybrid aerogel modified polyvinylidene fluoride membrane and preparation method thereof
  • TiO2/C hybrid aerogel modified polyvinylidene fluoride membrane and preparation method thereof
  • TiO2/C hybrid aerogel modified polyvinylidene fluoride membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Weigh 32g PVDF, 163g N,N-dimethylacetamide, 4g polyvinylpyrrolidone and 1gTiO 2 / C hybrid airgel was placed in a three-necked round-bottomed flask, mechanically stirred in a water bath at 60°C for 12h until the solid powder was completely dissolved; then the casting solution was left standing at 60°C for defoaming for 12h to prepare for scraping, and finally Use a glass rod to scrape the casting solution on the glass plate to form a film (requirement: the glass plate must be absolutely dry, clean, and free from impurities); expose the glass plate to the air for 20 seconds and then immerse it in a coagulation bath at 20°C (50~ 60% ethanol aqueous solution) into a film by immersion precipitation phase inversion. Soak the prepared film in distilled water for one week and then dry it in an oven at 60°C to obtain the film, which can be cut according to the required size before use.

Embodiment 2

[0037] Weigh 32g PVDF, 162g N,N-dimethylacetamide, 4g polyvinylpyrrolidone and 2gTiO 2 / C hybrid airgel was placed in a three-necked round-bottomed flask, mechanically stirred in a water bath at 60°C for 12h until the solid powder was completely dissolved; then the casting solution was left standing at 60°C for defoaming for 12h to prepare for scraping, and finally Use a glass rod to scrape the casting solution on the glass plate to form a film (requirement: the glass plate must be absolutely dry, clean, and free from impurities); expose the glass plate to the air for 20 seconds and then immerse it in a coagulation bath at 20°C (50~ 60% ethanol aqueous solution) into a film by immersion precipitation phase inversion. Soak the prepared film in distilled water for one week and then dry it in an oven at 60°C to obtain the film, which can be cut according to the required size before use.

Embodiment 3

[0039] Weigh 32g PVDF, 161g N,N-dimethylacetamide, 4g polyvinylpyrrolidone and 3gTiO 2 / C hybrid airgel was placed in a three-necked round-bottomed flask, mechanically stirred in a water bath at 60°C for 12h until the solid powder was completely dissolved; then the casting solution was left standing at 60°C for defoaming for 12h to prepare for scraping, and finally Use a glass rod to scrape the casting solution on the glass plate to form a film (requirement: the glass plate must be absolutely dry, clean, and free from impurities); expose the glass plate to the air for 20 seconds and then immerse it in a coagulation bath at 20°C (50~ 60% ethanol aqueous solution) into a film by immersion precipitation phase inversion. Soak the prepared film in distilled water for one week and then dry it in an oven at 60°C to obtain the film, which can be cut according to the required size before use.

[0040] For the prepared TiO 2 / C modified PVDF ultrafiltration membrane performance test and...

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Abstract

The invention provides a TiO2 / C hybrid aerogel modified polyvinylidene fluoride membrane. The TiO2 / C hybrid aerogel modified polyvinylidene fluoride membrane consists of PVDF, a pore-foaming agent, TiO2 / C hybrid aerogel and an organic solvent. The invention also provides a preparation method of the TiO2 / C hybrid aerogel modified polyvinylidene fluoride membrane. The method comprises the steps of preparing membrane casting solution firstly, mechanically stirring the membrane casting solution in a thermostat water bath to fully dissolve PVDF, standing and defoaming the membrane casting solution for membrane scraping, scraping the membrane casting solution on a glass plate by a glass rod to form a membrane, exposing the glass plate in air, soaking the glass plate in coagulating bath to form the membrane by immersion precipitation phase inversion, soaking the prepared membrane in distilled water for 5-8 days, taking out and airing to obtain the membrane. According to the TiO2 / C hybrid aerogel modified polyvinylidene fluoride membrane, the TiO2 / C hydrophilic composite material is added on the surface of the PVDF ultrafiltration membrane, so that the hydrophilcity of the PVDF ultrafiltration membrane is effectively improved, the energy consumption is greatly reduced, the TiO2 / C can be adopted for photocatalytic degradation of organic matters and the service life of the membrane is prolonged.

Description

technical field [0001] The invention belongs to the technical field of membrane separation such as biological separation and wastewater treatment, and in particular relates to a polyvinylidene fluoride membrane, specifically a TiO 2 / C hybrid airgel modified PVDF membrane and its preparation method. Background technique [0002] In recent years, the development of membrane technology can be described as rapid. Membrane separation has attracted widespread attention because of its no phase change and no secondary pollution during the separation process. Because polyvinylidene fluoride (PVDF) has good chemical resistance, good porosity, and good thermomechanical properties, it has become a widely used membrane material, such as industrial wastewater treatment and reverse osmosis pretreatment. However, PVDF is strongly hydrophobic, and it is easy to adsorb biomacromolecules and other organic substances to cause membrane fouling, which limits its application in the fields of bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 毕东苏李隽何慧红王鹏
Owner SHANGHAI INST OF TECH
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