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Blending modified polyvinylidene fluoride membrane and preparation method and application

A polyvinylidene fluoride membrane, blending modification technology, applied in the field of microporous membrane, can solve the problem of unsatisfactory anti-fouling performance of membrane

Inactive Publication Date: 2019-08-23
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to modify the membrane in view of the unsatisfactory anti-pollution performance of the membrane in the vacuum membrane distillation process. By adding nano-graphene and titanium dioxide to polyvinylidene fluoride, under the premise of ensuring the hydrophobic performance of the membrane , enhance the anti-fouling performance of the membrane, and use the improved vacuum membrane distillation process, use ultraviolet assistance in the experiment process, reduce the membrane fouling that occurs during the membrane distillation process, and reduce the membrane flux attenuation

Method used

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  • Blending modified polyvinylidene fluoride membrane and preparation method and application
  • Blending modified polyvinylidene fluoride membrane and preparation method and application
  • Blending modified polyvinylidene fluoride membrane and preparation method and application

Examples

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preparation example Construction

[0035] A preparation method of a blended modified polyvinylidene fluoride film, the preparation method comprising:

[0036] (1) Preparation of casting liquid: adding titanium dioxide, graphene and porogen to polar solvent and mixing, then adding polyvinylidene fluoride, and mixing evenly to obtain casting liquid;

[0037] (2) Preparation of the blended matrix film: after scraping the film casting liquid, it is cured in a coagulation bath, soaked and air-dried to obtain a blended matrix film.

[0038] Step (1) The casting solution includes 10-15wt% polyvinylidene fluoride polymer, 1-5wt% porogen, 0.1-0.5wt% graphene, 2.8-7wt% titanium dioxide, and the balance is For polar solvents, the above substances add up to 100%.

[0039] The porogen is selected from lithium chloride, polyethylene glycol or polypyrrolidone, and the polar solvent is selected from N,N-dimethylacetamide.

[0040] The specific steps of step (1) are to add titanium dioxide, graphene and porogen into a polar sol...

Embodiment 1

[0053] Example 1: Preparation of the blend-modified polyvinylidene fluoride film of the present invention;

[0054] Graphene / TiO 2 - Preparation of PVDF composite membrane: First, weigh 0.05g of graphene, 2.5g of titanium dioxide and 1.5g of lithium chloride, and put the weighed drugs into 43.5g of N,N-dimethylacetamide (DMAc) solvent. Shake the solution well into an ultrasonic cleaner, set the ultrasonic power to 400W, the temperature to 40°C, and ultrasonically disperse for 2h. 6.5g of PVDF was added under stirring, and the stirring temperature was set to 60°C, and a uniform casting solution was obtained after stirring for 12 hours. Let stand for 24h to remove air bubbles in the casting solution. Cast the prepared casting solution on a smooth and clean glass plate, scrape it into a thin layer with a thickness of 200 μm with a self-made doctor blade (glass rod), and then put the glass plate into a 40wt% ethanol aqueous solution. Replace and separate the phases. After the m...

Embodiment 2

[0055] Example 2: Preparation of the blend-modified polyvinylidene fluoride film of the present invention;

[0056] Graphene / TiO 2 - Preparation of PVDF composite membrane: First, weigh 0.15g of graphene, 2.5g of titanium dioxide and 1.5g of lithium chloride, and put the weighed drugs into 43.5g of N,N-dimethylacetamide (DMAc) solvent. Shake the solution well into an ultrasonic cleaner, set the ultrasonic power to 400W, the temperature to 40°C, and ultrasonically disperse for 2h. 6.5g of PVDF was added under stirring, and the stirring temperature was set to 60°C, and a uniform casting solution was obtained after stirring for 12 hours. Let stand for 24h to remove air bubbles in the casting solution. Cast the prepared casting solution on a smooth and clean glass plate, scrape it into a thin layer with a thickness of 200 μm with a self-made doctor blade (glass rod), and then put the glass plate into a 40wt% ethanol aqueous solution. Replace and separate the phases. After the m...

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Abstract

The invention relates to the technical field of micro-porous membranes, in particular to a blending modified polyvinylidene fluoride membrane and a preparation method and application. The preparationmethod of the blending modified polyvinylidene fluoride membrane is that first a membrane-casting solution is prepared, and then a blended matrix membrane is prepared. The prepared blending modified polyvinylidene fluoride membrane is used in a vacuum membrane distillation process, and especially used in a vacuum membrane distillation separation and recovery process in the field of high salinity organic wastewater. The method has simple film-forming process and convenient operation. By adding nano-graphene and titanium dioxide to polyvinylidene fluoride, the anti-fouling performance of the membrane is enhanced under the premise of ensuring the hydrophobic property of the membrane. In the experiment process, the auxiliary use of a ultraviolet light is carried out, the membrane fouling appeared in the membrane distillation process is reduced, the membrane flux attenuation is reduced, and thus the blending modified polyvinylidene fluoride membrane has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of microporous membranes, in particular to a method for reducing the formation of membrane fouling in a vacuum membrane distillation process. Background technique [0002] The composition of industrial wastewater is relatively complex, including a large amount of inorganic salts and organic matter, which brings great difficulties to wastewater treatment. Membrane distillation is an emerging membrane separation technology in recent years. Membrane distillation technology combines traditional distillation and membrane separation technology skillfully. Compared with conventional separation methods, membrane distillation technology has lower energy consumption and lower energy consumption than general reverse osmosis methods. The required working pressure is lower and can be carried out under milder operating conditions. Membrane distillation technology has a good application effect in seawater desalination, re...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00B01D61/36C02F1/44C02F1/32C02F101/30
CPCB01D61/364B01D67/0079B01D69/02B01D71/34B01D2325/10B01D2325/24B01D2325/26B01D2325/30B01D2325/38C02F1/32C02F1/447C02F2101/30C02F2101/308C02F2301/063C02F2303/14C02F2305/10
Inventor 姚辉孙勇刘红晶胡爱军张莹朱静
Owner SHENYANG POLYTECHNIC UNIV
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