Preparation method of modified polyacrylonitrile forward osmosis membrane

A polyacrylonitrile-based membrane, polyacrylonitrile technology, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of decreased salt interception rate, lack of technical inspiration, and large contact angle, etc., to achieve Increased salt interception rate and water flux, broadened application range, and improved pollution resistance

Active Publication Date: 2020-03-27
CHAMBROAD CHEM IND RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using physical modification method to introduce MOFs into the membrane preparation process, the common method is that MOFs and small molecule pore formers are used as mixed additives to be mixed and dissolved with PAN to prepare membrane casting liquid, which is limited by the uneven dispersion of additives. The surface of the obtained membrane will have defects, and a water channel will be formed on the surface of the membrane, so that salt ions will pass through the membrane along this channel, resulting in an increase in the flux of the membrane when used for water treatment, but a decrease in the salt rejection rate; and Commonly used chemical grafting modification, such as modifying the polyamide film layer by interfacial polymerization on the surface of polyacrylonitrile, according to literature reports, the modified composite film has been tested to show that the contact angle will become larger and the hydrophilicity will become worse. Moreover, the rejection rate is also lower than that of the base membrane, which has no practical significance for water treatment.
[0005] However, in the prior art, there is no related technology that better applies metal-organic framework materials (MOFs) to forward osmosis membranes, and there is also a lack of corresponding technical inspiration to help those skilled in the art overcome the above-mentioned defects of the prior art to obtain better forward osmosis membranes. permeable membrane

Method used

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  • Preparation method of modified polyacrylonitrile forward osmosis membrane
  • Preparation method of modified polyacrylonitrile forward osmosis membrane
  • Preparation method of modified polyacrylonitrile forward osmosis membrane

Examples

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Embodiment 1

[0049] A preparation method of a modified polyacrylonitrile forward osmosis membrane, the specific steps are as follows:

[0050] (1) Pretreatment of polyacrylonitrile-based membrane

[0051] Cut the polyacrylonitrile ultrafiltration membrane to be modified into a square piece of 8cm×8cm, soak it in ultrapure aqueous solution for 24 hours at room temperature, take out the soaked membrane after 24 hours, and then use ultrapure water repeatedly Rinse 5 times, and after the rinsing is completed, dry it in an electric blast drying oven at 40°C for subsequent use.

[0052] (2) Hydrolytic modification of polyacrylonitrile-based membrane: alkalization process

[0053] Weigh 40.0 g of NaOH on an electronic balance and place it in a 500 mL beaker, add 500 mL of ultrapure water into the beaker, stir evenly with a glass rod, and prepare a 2.0 mol / L NaOH solution for later use. Put the polyacrylonitrile ultrafiltration membrane to be modified in a petri dish, and add the prepared NaOH s...

Embodiment 2

[0062] A preparation method of a modified polyacrylonitrile forward osmosis membrane, the specific steps are as follows:

[0063] (1) Pretreatment of polyacrylonitrile-based membrane

[0064] Cut the polyacrylonitrile ultrafiltration membrane to be modified into a square piece of 8cm×8cm, soak it in ultrapure aqueous solution for 24 hours at room temperature, take out the soaked membrane after 24 hours, and then use ultrapure water repeatedly Rinse 5 times, and after the rinsing is completed, dry it in an electric blast drying oven at 40°C for subsequent use.

[0065] (2) Hydrolytic modification of polyacrylonitrile-based membrane: alkalization process

[0066] Weigh 40.0 g of NaOH on an electronic balance and place it in a 500 mL beaker, add 500 mL of ultrapure water into the beaker, stir evenly with a glass rod, and prepare a 2.0 mol / L NaOH solution for later use. Put the polyacrylonitrile ultrafiltration membrane to be modified in a petri dish, and add the prepared NaOH s...

Embodiment 3

[0075] A preparation method of a modified polyacrylonitrile forward osmosis membrane, the specific steps are as follows:

[0076] (1) Pretreatment of polyacrylonitrile-based membrane

[0077] Cut the polyacrylonitrile ultrafiltration membrane (commercial membrane) to be modified into a square piece of 8cm×8cm, soak it in ultrapure aqueous solution for 24h at room temperature, take out the soaked membrane after 24h, and use it after taking it out Rinse with ultrapure water 5 times repeatedly, and dry in an electric blast drying oven at 40°C for later use.

[0078] (2) Hydrolytic modification of polyacrylonitrile-based membrane: alkalization process

[0079] Weigh 40.0 g of NaOH on an electronic balance and place it in a 500 mL beaker, add 500 mL of ultrapure water into the beaker, stir evenly with a glass rod, and prepare a 2.0 mol / L NaOH solution for later use. Put the polyacrylonitrile ultrafiltration membrane to be modified in a petri dish, and add the prepared NaOH soluti...

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Abstract

The invention belongs to the field of new materials and relates to a preparation method of modified polyacrylonitrile forward osmosis membrane. The forward osmosis membrane is obtained by carrying outchemical modification on PAN, naOH, HCl and the like are used for modifying a PAN film, then, a MOFs material Cu-BTC with a porous structure is introduced, a layer-by-layer self-assembly method is used, a continuous compact Cu-BTC film layer is obtained on the surface of the film, therefore, the performance of the membrane is better improved, the salt rejection rate and the organic pollutant separation efficiency of the membrane are improved, meanwhile, the water flux of the membrane is not influenced, both the salt rejection rate and the water flux are improved, meanwhile, the membrane has good tolerance to an organic solvent, acid and alkali, and the application range of a modified separation membrane is widened. Meanwhile, the smooth surface of the material is not beneficial to breeding of bacteria, and the pollution resistance of the modified separation membrane can be improved.

Description

technical field [0001] The invention relates to the technical field of new materials, and specifically provides a preparation method of a modified polyacrylonitrile forward osmosis membrane. Background technique [0002] With the increase of population density year by year, the scale and scope of production and life continue to expand, and the human demand for fresh water resources is increasing, but the available water resources are very scarce at this stage. Most of the earth is covered by oceans. At present, people generally adopt a variety of water treatment methods such as seawater desalination and waste water recycling to obtain sufficient fresh water supply, but these methods are at the cost of consuming a lot of energy. Membrane separation technology is a newly emerging technology for water treatment applications. It has high output efficiency and is very environmentally friendly. It also has the characteristics of low energy consumption, strong adaptability, and sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D71/42
CPCB01D67/0006B01D69/125B01D71/42
Inventor 王新萍马韵升崔丽云孟祥民栾波王磊
Owner CHAMBROAD CHEM IND RES INST CO LTD
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