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Preparation method of polyvinylidene fluoride ultrafiltration membrane modified by hydrophilic graphene

A polyvinylidene fluoride and graphene modification technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of poor anti-pollution and low flux of ultrafiltration membranes, and achieve convenient preparation and wide application value. , The effect of modification method is simple

Active Publication Date: 2019-09-27
埃隆水处理技术(上海)有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a polyvinylidene fluoride ultrafiltration membrane modified by hydrophilic graphene in order to solve the problems of the existing ultrafiltration membranes, such as low flux, poor anti-pollution, and need to soak in glycerin

Method used

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specific Embodiment approach 1

[0023] Specific embodiment one: what this embodiment records is a kind of preparation method of polyvinylidene fluoride ultrafiltration membrane modified by hydrophilic graphene, and described method step is as follows:

[0024] Step 1: Freeze-dry the 0.05mg / mL~4mg / mL graphene oxide solution to make powder, put the powder in a high-temperature furnace and bake at 150°C for 2 hours to prepare nitrogen oxide (nitrogen comes from the baking atmosphere) hybrid graphene, and disperse it in an organic solvent to obtain a nitrogen-oxygen hybrid graphene dispersion; the graphene oxide is prepared by a hummer oxidation method, which has a large number of hydroxyl and carboxyl groups; the baking The atmospheric conditions are ammonia, urea, melamine or other nitrogen-containing compounds or phosphorus-containing compounds or sulfur-containing compounds;

[0025]Step 2: Add membrane materials and additives to the nitrogen-oxygen hybrid graphene dispersion obtained in Step 1 successively ...

specific Embodiment approach 2

[0027] Specific embodiment two: a kind of preparation method of polyvinylidene fluoride ultrafiltration membrane modified by hydrophilic graphene described in specific embodiment one, in step one, described organic solvent is N, N-dimethyl formaldehyde One or more of amide, N, N-dimethylacetamide, methylpyrrolidone, dimethyl sulfoxide, hexamethylphosphoramide; the dispersion treatment is one of ultrasonic treatment, stirring treatment and shock treatment One or more kinds, the oxynitride graphene can be uniformly dispersed in the organic solvent, and the time of the dispersion treatment is 1-2 hours.

specific Embodiment approach 3

[0028] Specific embodiment three: the preparation method of a polyvinylidene fluoride ultrafiltration membrane modified by hydrophilic graphene described in specific embodiment one, in step 2, the additive is polyvinylpyrrolidone, methylpyrrolidone, ethanol, One or more of lithium chloride and polyethylene glycol; the membrane material is one of polysulfone, polyethersulfone, polyvinylidene fluoride, and polyacrylonitrile.

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Abstract

The invention discloses a preparation method of a polyvinylidene fluoride ultrafiltration membrane modified by hydrophilic graphene, and belongs to the technical field of polymer separation membrane and water treatment application. The method comprises the steps that a graphene oxide solution is freeze-dried to form powder, high temperature baking is conducted to prepare a nitrogen-oxygen hybridized graphene, and the nitrogen-oxygen hybridized graphene is dispersed in an organic solvent; a membrane material and an additive are added to the nitrogen-oxygen hybridized graphene dispersion liquid, after swelling, stirring is conducted to obtain a casting solution, and the casting solution is subjected to vacuum defoaming and then standing; the casting solution is scraped on a support to form a solution film, the support and the solution film are immersed in a coagulation bath, and polymers in the solution are precipitated and solidified to obtain the polyvinylidene fluoride ultrafiltration membrane modified by the hydrophilic graphene. By adding modified graphene, the antibacterial property of the ultrafiltration membrane is improved, the ultrafiltration membrane has high strength, high throughput and high separation precision, and immersion with a protective liquid is saved. The raw material graphene is convenient to prepare, and the graphene modification method is simple and easy to apply in industrial production.

Description

technical field [0001] The invention belongs to the technical fields of polymer separation membrane technology and water treatment application, and in particular relates to a preparation method of a polyvinylidene fluoride ultrafiltration membrane modified by hydrophilic graphene. Background technique [0002] Ultrafiltration separation membrane technology has been widely used in the terminal treatment of wastewater treatment and ultrapure water preparation, and can also be used in blood treatment, separation, concentration, purification of biomedical products and food industry products. With the improvement and strengthening of ultrafiltration membrane technology, the contribution of ultrafiltration membranes to human life and industrial development will also increase. The ultrafiltration process is a pressure-driven membrane process. Generally speaking, the pressure difference between the two sides of the membrane in the ultrafiltration process is 0.3-1.0Mpa. An important ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D71/02B01D69/12B01D67/00B01D61/14
CPCB01D71/34B01D71/021B01D69/12B01D67/0079B01D61/14B01D2325/48
Inventor 商策黄轶禾宋文广
Owner 埃隆水处理技术(上海)有限公司
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