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Forward-osmosis film and preparation method thereof

A forward osmosis membrane and ultrafiltration membrane technology, applied in the field of membrane separation, can solve problems such as hindering the development of forward osmosis membrane separation technology, decreasing osmotic pressure difference, and decreasing water flux, so as to improve hydrophilic performance and reduce internal concentration. Differential polarization, the effect of increasing flux

Active Publication Date: 2016-08-17
HEILONGJIANG BAYI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this product still has a relatively serious internal concentration polarization phenomenon, which leads to a sharp drop in the osmotic pressure difference on both sides of the membrane and a decrease in water flux.
Internal concentration polarization has become an obstacle to the development of forward osmosis membrane separation technology

Method used

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Examples

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Effect test

preparation example Construction

[0039] The present invention also provides a kind of preparation method of forward osmosis membrane, comprises the following steps:

[0040] (1) Soak the ultrafiltration membrane in a positively charged solution and shake it to make the inside of the ultrafiltration membrane positively charged;

[0041] As mentioned above, the overall charge of the ultrafiltration membrane is adjusted. It can be understood that the positively charged solution can be polyetherimide solution, polyallylamine hydrochloride solution, dodecyl dimethyl ammonium chloride solution, dimethyl diene One of the propylammonium chloride solutions.

[0042] (2) ultrasonically dispersing graphene oxide in water to obtain a graphene oxide aqueous solution with a graphene oxide concentration of 0.1 g / L to 10 g / L;

[0043] As mentioned above, graphene oxide flakes are the product of graphene after chemical oxidation and exfoliation. Graphene oxide is a single atomic layer that can expand to tens of microns in l...

Embodiment 1

[0069] (1) Soak the polysulfone ultrafiltration membrane with a pore size of 0.01 μm in the polyetherimide solution, and shake it, so that the inside of the polysulfone ultrafiltration membrane is positively charged;

[0070] (2) Ultrasonic dispersion of graphene oxide in deionized water to obtain a concentration of 0.1g / L graphene oxide aqueous solution;

[0071] (3) mixing the polyamide-amine solution with a concentration of 1 mg / L with the graphene oxide aqueous solution in step (2), wherein the volume ratio of the polyamide-amine solution to the graphene oxide aqueous solution is 1:1 to obtain a mixed liquid;

[0072] (4) The mixed solution in the step (3) is vacuum filtered through a polysulfone ultrafiltration membrane, and the pressure is 0.4 bar during vacuum filtration, and the filtered polysulfone ultrafiltration membrane is for subsequent use;

[0073] (5) After the polysulfone ultrafiltration membrane in step (4) is placed in an oven for heat treatment, the temper...

Embodiment 2

[0075] (1) Soak the polyethersulfone ultrafiltration membrane with a pore size of 0.02 μm in dimethyl diallyl ammonium chloride, and shake it, so that the inside of the polyethersulfone ultrafiltration membrane is positively charged;

[0076] (2) Ultrasonic dispersion of graphene oxide in deionized water to obtain a concentration of 1g / L graphene oxide aqueous solution;

[0077] (3) Mix the polyamide-amine solution with a concentration of 5mg / L with the graphene oxide aqueous solution in step (2), wherein the volume ratio of the polyamide-amine solution to the graphene oxide aqueous solution is 1:2, add ethanol solution As a catalyst, a mixed solution is obtained;

[0078] (4) The mixed solution in the step (3) is vacuum filtered through a polyethersulfone ultrafiltration membrane, and the pressure is 0.6 bar during vacuum filtration, and the filtered polyethersulfone ultrafiltration membrane is for subsequent use;

[0079] (5) After placing the polyethersulfone ultrafiltrati...

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Abstract

The invention provides a forward-osmosis film and a preparation method thereof. The forward-osmosis film comprises a support layer, the support layer is a superfilter film, oxidized graphene, and 0-2nd generation polyamide-amide blend. The forward-osmosis film is high in water flux, graphene layers are not easy to shed among layers and from the superfilter film as interlayer distance among oxidized graphene layers is constant, and distance among the oxidized graphene layers can be adjusted. Meanwhile, the forward-osmosis film has high cutoff performance for negative and positive ions in the solution, and the overall cutoff performance of the film is optimized.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a forward osmosis membrane and a preparation method thereof. Background technique [0002] In a broad sense, all dense and non-porous selectively permeable membranes can be used as forward osmosis membrane materials. For example, the forward osmosis membranes used by early researchers for forward osmosis research include animal bladders, rubber, nitrocellulose, ceramics, and reverse osmosis membranes. Permeable membranes and nanofiltration membranes, etc. With the progress of forward osmosis research, it was found that when these selectively permeable membranes were used for forward osmosis experiments, the obtained membrane flux was far lower than the theoretical value. The difference between the forward osmosis membrane and the traditional pressure-driven membrane is that it does not require high mechanical strength and does not need to withstand extern...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D71/56B01D71/68B01D71/42B01D69/12B01D67/00
CPCB01D67/0079B01D67/0083B01D69/12B01D71/021B01D71/42B01D71/56B01D71/68
Inventor 金丽梅李大鹏张春芝王霞
Owner HEILONGJIANG BAYI AGRICULTURAL UNIVERSITY
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