Modified composite fiber membrane for oil-water separation, and preparation method thereof

A technology of oil-water separation and nanofiber membrane, which is applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problems of low removal rate, low membrane flux, poor selectivity of oil-water separation membrane, etc., and achieve high-efficiency oil-water separation, Good film-forming performance and simple operation

Active Publication Date: 2019-11-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problems of poor selectivity, low removal rate, and low membrane flux of existing oil-water separation membranes, the present inventio

Method used

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  • Modified composite fiber membrane for oil-water separation, and preparation method thereof
  • Modified composite fiber membrane for oil-water separation, and preparation method thereof
  • Modified composite fiber membrane for oil-water separation, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] ① Preparation of MOFs

[0050] MOFs are prepared by adding 0.0172mol / L zirconium tetrachloride (ZrCl 4 ), 0.0172mol / L 2-aminoterephthalic acid was dissolved in a mixed solvent with a ratio of 3 / 100 (V / V) acetic acid and N,N-dimethylformamide, and the reaction was stirred at 100°C for 24h, The resulting particles were centrifuged and washed three times with N,N-dimethylformamide to obtain the MOFs.

[0051] ② Preparation of PAN solution

[0052] The PAN solution is prepared by uniformly mixing polyacrylonitrile with a molecular weight of 150,000 and solvent N,N-dimethylformamide at 60° C. according to the weight percentage of 20 wt % and 80 wt %.

[0053] ③ Preparation of MOFs solution

[0054] The MOFs solution is prepared by uniformly mixing the MOFs obtained in step ① and the solvent N,N-dimethylformamide at 0.4wt% and 99.6wt% at room temperature.

[0055] ④ Preparation of casting solution

[0056] The casting solution is prepared by mixing the solutions obtained...

Embodiment 2

[0063] ① Preparation of MOFs

[0064] MOFs are prepared by adding 0.0172mol / L zirconium tetrachloride (ZrCl 4 ), 0.0172mol / L 2-aminoterephthalic acid was dissolved in a mixed solvent with a ratio of 3 / 100 (V / V) acetic acid and N,N-dimethylformamide, and the reaction was stirred at 100°C for 24h, The resulting particles were centrifuged and washed three times with N,N-dimethylformamide to obtain the MOFs.

[0065] ② Preparation of PAN solution

[0066] The PAN solution is prepared by uniformly mixing polyacrylonitrile with a molecular weight of 150,000 and solvent N,N-dimethylformamide at 60° C. according to the weight percentage of 20 wt % and 80 wt %.

[0067] ③ Preparation of MOFs solution

[0068] The MOFs solution is prepared by uniformly mixing the MOFs obtained in step ① and the solvent N,N-dimethylformamide at 1 wt% and 99 wt% at room temperature.

[0069] ④ Preparation of casting solution

[0070] The casting solution is prepared by mixing the solutions obtained i...

Embodiment 3

[0077] ① Preparation of MOFs

[0078] MOFs are prepared by adding 0.0172mol / L zirconium tetrachloride (ZrCl 4 ), 0.0172mol / L 2-aminoterephthalic acid was dissolved in a mixed solvent with a ratio of 3 / 100 (V / V) acetic acid and N,N-dimethylformamide, and stirred and reacted at 100°C for 24h, The resulting particles were centrifuged and washed three times with N,N-dimethylformamide to obtain the MOFs.

[0079] ② Preparation of PAN solution

[0080] The PAN solution is prepared by uniformly mixing polyacrylonitrile with a molecular weight of 150,000 and solvent N,N-dimethylformamide at 60° C. according to weight percentages of 20 wt % and 80 wt %.

[0081] ③ Preparation of MOFs solution

[0082] The MOFs solution is prepared by uniformly mixing the MOFs obtained in step ① and the solvent N,N-dimethylformamide at 2wt% and 98wt% by weight at room temperature.

[0083] ④ Preparation of casting solution

[0084] The casting solution is prepared by mixing the solutions obtained i...

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Abstract

The invention discloses a modified composite fiber membrane for oil-water separation, and a preparation method thereof. The preparation method comprises the following steps: mixing a PAN-containing solution with an MOFs-containing solution to obtain a membrane casting solution, and electrospinningthe membrane casting solution to obtain a base membrane; and drying the base membrane, and coating thebase membrane with fluorosilane steam to obtain the nanofiber membrane, wherein the membrane casting solution includes 5-12 wt% of PAN, 0.2-1 wt% of MOFs and 87-94.8 wt% of a polar solvent; and the MOFs are NH2-UIO-66(Zr). The preparation method has the advantages of simplicity in operation, go film-forming property, and uniform distribution of the MOFs material in the fiber, the water contact angle of the surface of the membrane is 150.4 DEG and reaches a superhydrophobic condition, the adsorption capacity of the composite fiber membrane to silicone oil reaches 33.7 g/g, the oil flux of dichloromethane separation under the action of gravity is 2286 L.m<-2>h<-1>, the separation efficiency exceeds 99.8%, the oil flux after ten cycles is still kept at 1792 L.m<-2>h<-1>, and the composite fiber membrane is used for efficient oil-water separation.

Description

technical field [0001] The invention relates to a modified composite fiber membrane for oil-water separation and a preparation method thereof, and belongs to the technical field of preparation of hydrophobic and lipophilic oil-water separation membranes. Background technique [0002] With the development of industry and the continuous improvement of people's living standards, a large amount of oily wastewater is discharged into natural water bodies. The density of oil is lower than that of water, which makes it float on the surface of water bodies and isolates the oxygen exchange between water bodies and the atmospheric environment. , leading to the death and decay of aquatic animals and plants due to lack of oxygen, and the breeding of a large number of anaerobic bacteria, which further consumes the oxygen in the water body, forming a vicious circle. There are also some micron oil droplets that are evenly dispersed in water to form emulsions in the presence of surfactants, ...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D67/00B01D71/42B01D17/02D01F6/54D01F1/10
CPCB01D17/0202B01D67/0011B01D67/0088B01D69/02B01D71/42B01D2325/38D01F1/10D01F6/54
Inventor 陈仰蒋兰英
Owner CENT SOUTH UNIV
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