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Hydrogel ultrafiltration membrane as well as preparation method and application thereof

A technology of ultrafiltration membranes and hydrogels, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the problems of low flux of ultrafiltration membranes and poor oil-water separation effect, and achieve large water fluxes , Excellent oil-water separation effect, high oil-water separation efficiency

Active Publication Date: 2020-09-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of low membrane flux and poor oil-water separation effect of the ultrafiltration membrane in the prior art, the present invention provides a preparation method of a modified polyacrylonitrile hydrogel membrane, through homogeneous alkalinization reaction and ion The cross-linking method makes the polyacrylonitrile membrane with insufficient hydrophilicity hydrophilic and maintains superhydrophilic-underwater superoleophobicity for a long time to obtain long-term fouling resistance of the membrane while ensuring better separation performance of the membrane

Method used

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  • Hydrogel ultrafiltration membrane as well as preparation method and application thereof
  • Hydrogel ultrafiltration membrane as well as preparation method and application thereof
  • Hydrogel ultrafiltration membrane as well as preparation method and application thereof

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Embodiment 1

[0052] figure 1 Prepare flow chart for hydrogel ultrafiltration membrane of the present invention, as figure 1 Shown, the preparation method of the hydrogel ultrafiltration membrane of the present embodiment is as follows:

[0053] 1) Preparation of polyacrylonitrile casting solution: polyacrylonitrile (PAN) was dissolved in DMF to prepare a PAN casting solution with a concentration of 10 mg / mL and a volume of 10 mL;

[0054] 2) Under the condition of stirring at 90°C, add 0.4 mL of NaOH aqueous solution (NaOH / H 2 (2, 0.1mol / L) and then continue to react for 4h;

[0055] 3) then dripping 0.6mL concentration is the cupric chloride solution of 0.2mol / L, and described cupric chloride solution is that cupric chloride is dissolved in DMF and prepares (CuCl 2 / DMF, 0.2mol / L), continue to react for 4h and then stand at 90°C for 2h for defoaming.

[0056] 4) Pour the casting solution obtained after step 3) on a dry and clean glass plate, scrape it flat with a casting knife, then i...

Embodiment 2

[0061] The preparation method of the hydrogel ultrafiltration membrane of the present embodiment is as follows:

[0062] 1) Prepare PAN casting solution: dissolve PAN in DMF to prepare a PAN casting solution with a concentration of 18mg / mL and a volume of 10mL;

[0063] 2) Under the condition of stirring at 80°C, add 0.4 mL of NaOH aqueous solution (NaOH / H 2 (2, 0.6mol / L) and then continue to react for 5h;

[0064] 3) then dripping 0.8mL concentration is the cupric chloride solution of 0.1mol / L, and described cupric chloride solution is to be prepared by dissolving cupric chloride in DMF (CuCl 2 / DMF, 0.1mol / L), continue to react for 3h and then stand at 80°C for 5h for defoaming.

[0065] 4) Pour the casting solution obtained after step 3) on a dry and clean glass plate, scrape it flat with a casting knife, then immediately soak the glass plate and the scraped film into deionized water for phase inversion, and finally put the film Store in deionized water.

Embodiment 3

[0067] The preparation method of the hydrogel ultrafiltration membrane of the present embodiment is as follows:

[0068] 1) Prepare PAN casting solution: dissolve PAN in DMF, prepare PAN casting solution with a concentration of 16mg / mL, and the volume is 10mL;

[0069] 2) Under the condition of stirring at 60°C, add 0.4 mL of NaOH aqueous solution (NaOH / H 2 (2, 0.25mol / L) and then continue to react for 3h;

[0070] 3) then dripping 0.8mL concentration is the ferric chloride solution of 0.6mol / L, and described cupric chloride solution is to be prepared by dissolving cupric chloride in DMF (FeCl 3 / DMF, 0.6mol / L), continue to react for 5h and then stand at 60°C for 3h for defoaming.

[0071] 4) Pour the casting solution obtained after step 3) on a dry and clean glass plate, scrape it flat with a casting knife, then immediately soak the glass plate and the scraped film into deionized water for phase inversion, and finally put the film Store in deionized water.

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Abstract

The invention belongs to the technical field of membrane preparation, and discloses a hydrogel ultrafiltration membrane as well as a preparation method and application thereof. The preparation methodof the hydrogel ultrafiltration membrane comprises the following steps: 1) preparation of a polyacrylonitrile membrane casting solution: dissolving polyacrylonitrile in DMF to prepare the polyacrylonitrile membrane casting solution; 2) homogeneous alkalization of polyacrylonitrile: dropwise adding a NaOH aqueous solution into the polyacrylonitrile membrane casting solution under the conditions ofheating and stirring, and reacting for a period of time; 3) cross-linking to form hydrogel: dropwise adding a DMF solution containing metal ions into the membrane casting solution, continuously reacting for a period of time, and performing standing defoaming treatment under a heating condition after the reaction is finished; and 4) performing phase inversion on the membrane casting solution treated in the step 3) to prepare the hydrogel ultrafiltration membrane, The hydrogel ultrafiltration membrane disclosed by the invention not only has super-hydrophilicity-underwater super-oleophobicity andlarge water flux, but also has high separation efficiency when being used for oil-water separation; the preparation process is simple, complex equipment is not needed, and the hydrogel ultrafiltration membrane is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, and in particular relates to a hydrogel ultrafiltration membrane, a preparation method and an application thereof. Background technique [0002] Oil spills at sea and industrial oily wastewater seriously threaten the aquatic environment and human health. Whether it is environmental governance, oil recovery or wastewater reuse, effective separation of oily wastewater is required. Traditional oil-water separation methods include adsorption method, chemical demulsification method, biological method, membrane separation method and so on. Among them, the membrane separation method has the characteristics of flexible operation, low environmental pollution, and resource utilization, and is the main development direction of oil-water separation technology. However, conventional polymer membranes generally have disadvantages such as poor anti-pollution ability, fast flux decay, and poor oil-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D67/00B01D71/42C02F1/44C02F1/40C02F101/32
CPCB01D69/02B01D71/42B01D67/0006B01D67/0002C02F1/44C02F1/40C02F2101/32B01D2323/02B01D2325/36
Inventor 张炜铭张文彬孙梦瑶吴道文
Owner NANJING UNIV
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