Preparation method of forward osmosis membrane modified with oxidized graphene

A graphene modification, forward osmosis membrane technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology and other directions, can solve the problems of large internal concentration polarization, unstable flux, low strength, etc. Simple process, simple film forming process, easy to achieve effect

Inactive Publication Date: 2016-05-18
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patent document of CN102580562A discloses "a preparation method of polyvinylidene fluoride composite cellulose acetate forward osmosis membrane", the patent document of CN103301758A discloses "a preparation method

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  • Preparation method of forward osmosis membrane modified with oxidized graphene
  • Preparation method of forward osmosis membrane modified with oxidized graphene
  • Preparation method of forward osmosis membrane modified with oxidized graphene

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Example Embodiment

[0050] Example 1.

[0051] Disperse 0.1% graphene oxide uniformly in 35% DMAC for 1 hour, then add 35% 1,4-dioxane and 13% acetone, additives 3.8% methanol, and 3.1% lactic acid into the dispersion at once , And finally add 10% high molecular polymer cellulose triacetate (CTA). Stir it in a 50°C constant temperature water bath until it is completely dissolved, and place it in a 50°C vacuum drying oven (vacuum degree of 0.08MPa) and let it stand to degas for more than 12 hours. Then, in an environment with a temperature of 20°C and a relative humidity of 70%, the film was scraped by a manual scraper using a phase inversion method. The supporting layer was a 150 mesh polyester screen. After the scraped film was volatilized in the air for 30 seconds, put it in In a coagulation bath of deionized water at 20°C, coagulate for 4 hours. Separate the membrane from the glass plate, and put the new membrane into pure water to fully soak for 48 hours to obtain a supported graphene oxide fl...

Example Embodiment

[0053] Example 2

[0054] Disperse 0.1% graphene oxide uniformly in 32% DMAC for 1 hour, then add 32% 1,4-dioxane, 12.4% acetone, additives 6% methanol, and 4.5% lactic acid to the dispersion at once , And finally add 13% polymer cellulose acetate (CA). Stir it in a 60°C constant temperature water bath until it is completely dissolved, and put it in a 60°C vacuum drying oven (vacuum degree of 0.08MPa) and let it stand for 12h or more to degas. Then, in an environment with a temperature of 20°C and a relative humidity of 70%, the film was scraped by a manual scraper using a phase inversion method. The supporting layer was a 150 mesh polyester screen. After the scraped film was volatilized in the air for 30 seconds, put it in In a coagulation bath of deionized water at 20°C, coagulate for 4 hours. Separate the membrane from the glass plate, and put the new membrane into pure water to fully soak for 48 hours to obtain a supported graphene oxide flat plate forward osmosis membrane....

Example Embodiment

[0056] Example 3

[0057] Disperse 0.1% graphene oxide uniformly in 32% DMAC for 1 hour, then add 32% 1,4-dioxane, 12.4% acetone, additives 6% methanol, and 4.5% lactic acid to the dispersion at once Finally, add 6.5% of the high molecular polymer cellulose triacetate (CTA) and 6.5% of the high molecular polymer cellulose acetate (CA), stir in a constant temperature water bath at 60°C until it is completely dissolved, and put it in 60°C In the vacuum drying oven (vacuum degree of 0.08MPa), let it stand for more than 12h to degas. Then, in an environment with a temperature of 20°C and a relative humidity of 70%, the film was scraped by a manual scraper using a phase inversion method. The support layer was a 250 mesh polyester screen. After the scraped film was volatilized in the air for 30 seconds, put it in In a coagulation bath of deionized water at 20°C, coagulate for 4 hours. Separate the membrane from the glass plate, and put the new membrane into pure water to fully soak f...

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Abstract

The invention provides a preparation method of a forward osmosis membrane modified with oxidized graphene. The preparation method comprises the following steps: 1, firstly, conducting ultrasonic dispersion on the oxidized graphene in high-polarity organic solvent, so that homogeneous dispersion liquid is obtained; 2, adding organic solvent of raw materials of a produced membrane to the dispersion liquid; 3, sequentially adding additives and the produced membrane to the dispersion liquid obtained in step 2, and stirring the mixture till the mixture is dissolved completely, so that casting membrane liquid is obtained; 4, conducting sufficient defoaming on the casting membrane liquid in a vacuum drying box, then pouring the casting membrane liquid on a glass plate where a support layer is laid, and conducting membrane scraping; 5, after membrane pouring is ended and the casting membrane liquid is volatilized in air, putting the casting membrane liquid in a coagulation bath; 6, separating a membrane piece with the glass plate, and putting the membrane piece into pure water for immersion; 7, conducting natural drying on the membrane which is sufficiently immersed as mentioned above, so that the forward osmosis membrane is obtained. The modified forward osmosis membrane prepared through the preparation method is good in hydrophilicity and water flux and great in antipollution capability, cleaning expense of the membrane is lowered, the service life of the membrane is greatly prolonged, and mechanical properties are improved a lot.

Description

technical field [0001] The invention relates to a method for preparing a life separation membrane, in particular to a method for preparing a forward osmosis membrane modified by graphene oxide. Background technique [0002] Forward osmosis membrane separation technology is an emerging technology that utilizes natural osmotic phenomena to alleviate the pressure of future water and energy. It is known as the most cutting-edge and most potential water purification and desalination technology in the world. Forward osmosis refers to the process of water flowing from the side of the lower osmotic pressure solution to the higher osmotic pressure side through the selectively permeable membrane. Forward osmosis membrane separation technology uses the osmotic pressure difference of the solution on both sides of the forward osmosis membrane as the driving force, so that water can spontaneously pass through the selective permeability membrane from the low concentration side to the high ...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D67/00B01D69/10B01D61/00
CPCB01D71/16B01D61/002B01D67/0079B01D69/10
Inventor 赵方波李静春卢佳琦赵婧李广录吴瑶
Owner HARBIN ENG UNIV
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