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Preparation method for organic-inorganic composite separation membrane with hydrophilicity and function of photocatalytic degradation of pollutants

An inorganic composite and photocatalytic technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of insufficient modification effect and functionality, and achieve good anti-protein pollution performance. , Significant anti-pollution effect, good hydrophilicity and the effect of photocatalytic degradation of pollutants

Inactive Publication Date: 2015-03-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the inorganic nanomaterials are dispersed in the casting solution, most of the inorganic nanomaterials are embedded in the membrane matrix after film formation, and cannot be effectively "concentrated" on the membrane surface, and their modification effect and functionality cannot be fully exerted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 0.5 g Fe 3 o 4 TiO 2 / Graphene oxide nanocomposites were ultrasonically dispersed in 79 grams of N-N dimethylacetamide, 19 grams of polyacrylonitrile and 1.5 grams of polyvinylpyrrolidone were added after 2 hours, and then heated and stirred in a water bath at 50 °C for 24 hours to obtain Fe 3 o 4 TiO 2 / Graphene oxide is uniformly dispersed in the casting solution, the casting solution is left to defoam; the glass plate is placed in an orthogonal magnetic field (magnetic field strength 15000 gauss), and then the casting solution is poured on the glass plate to scrape the film for 30 seconds Then put it into deionized water for coagulation under the action of a magnetic field, take out the membrane after 15 minutes and soak it in deionized water for 24 hours to obtain polyacrylonitrile-Fe 3 o 4 TiO 2 / Graphene oxide composite flat ultrafiltration membrane.

Embodiment 2

[0024] 1.5 g CoFe 2 o 4 TiO 2 / Graphene oxide nanocomposites are ultrasonically dispersed in 78 grams of N-N dimethylformamide, 18.5 grams of polyvinylidene fluoride and 2 grams of polyethylene glycol are added after 2 hours, and then heated and stirred in a water bath at 45°C for 24 hours to obtain CoFe 2 o 4 TiO 2 / Graphene oxide uniformly dispersed casting solution, the casting solution is left to defoam; the alumina porous tube is placed in an orthogonal magnetic field (magnetic field strength 12000 gauss) and then coated on the inner wall of the porous tube, after 25 seconds Under the action of a magnetic field, put it into a 3% aqueous solution of N-N dimethylformamide for coagulation, take out the membrane after 30 minutes and soak it in deionized water for 24 hours to obtain polyvinylidene fluoride-CoFe 2 o 4 TiO 2 / Graphene oxide composite tubular ultrafiltration membrane.

Embodiment 3

[0026] 2.5 g NiFe 2 o 4 TiO 2 / Graphene oxide nanocomposites were ultrasonically dispersed in 77.5 grams of dimethyl sulfoxide, 17.5 grams of polyamide and 2.5 grams of polyvinyl alcohol were added after 2 hours, and then heated and stirred in a water bath at 60 ° C for 24 hours to obtain NiFe 2 o 4 TiO 2 / Graphene oxide is uniformly dispersed in the casting solution, the casting solution is left to defoam; the polypropylene non-woven is placed in an orthogonal magnetic field (magnetic field strength 8000 gauss), and then the casting solution is poured on the non-woven fabric to scrape the film After 30 seconds, put it into 5% N-methylpyrrolidone aqueous solution for solidification under the action of a magnetic field, take out the film after 15 minutes and soak it in deionized water for 24 hours to obtain polyamide-NiFe 2 o 4 TiO 2 / Graphene oxide composite flat microfiltration membrane.

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Abstract

The invention relates to a preparation method for an organic-inorganic composite separation membrane with hydrophilicity and the function of photocatalytic degradation of pollutants. The steps include: (1) blending a magnetic composite photocatalytic material composed of the magnetic particle @TiO2 with a graphene oxide loaded core-shell structure, polymer resin, a solvent and an additive to prepare a membrane casting solution; (2) placing the obtained membrane casting solution in a 100-20000 Gauss magnetic field to prepare a membrane, after 10-200sec, immersing the membrane into a coagulation bath for 30-120sec coagulation, taking the membrane out of the coagulation bath, carrying out washing, soaking and drying, thus obtaining the composite separation membrane with the function. By applying the action of a magnetic field in the evaporation and coagulation process of membrane formation, migration of the magnetic composite photocatalytic material in the membrane casting solution to the surface of a separation membrane can be realized, thus solving the problem that during inorganic nano-material blending modification of the separation membrane, nano-materials are mostly embedded in a membrane matrix, and the modification effect of the nano-materials cannot be brought into full play. The surface of the polymer separation membrane is endowed with good hydrophilicity and the property of photocatalytic degradation of pollutants.

Description

technical field [0001] The invention belongs to the technical field of separation membrane modification, and in particular relates to a preparation method of an organic-inorganic composite separation membrane with the function of hydrophilicity and photocatalytic degradation of pollutants. Background technique [0002] Organic polymer has good chemical stability and thermal stability, and is a kind of separation membrane material with excellent comprehensive performance. At present, polymer ultrafiltration and microfiltration membranes have been successfully applied in the fields of chemical industry, textile, food and water treatment. However, due to its low surface energy and strong hydrophobicity, it is easy to cause surface contamination, which seriously affects the performance of the product. Therefore, in view of the problem of easy fouling of polymer separation membranes, various approaches have been studied and tried to improve the anti-fouling properties of the mem...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D67/00B01D71/34B01D71/56B01D69/02B01D69/06B01D69/04B01J23/755B01J23/75B01J23/745
Inventor 徐志伟吴腾飞姚红伟周宝明石睫李静马美君李英琳
Owner TIANJIN POLYTECHNIC UNIV
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