A modified composite fiber membrane for oil-water separation and its preparation method

A technology of oil-water separation and nanofiber membrane, applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problems of poor selectivity, low membrane flux, and low removal rate of oil-water separation membranes, and achieve excellent physical and chemical properties , good film-forming performance, and the effect of increasing surface roughness

Active Publication Date: 2021-10-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 invention provides a nanofiber membrane for oil-water separation and its preparation method, aiming to improve the hydrophobicity, Lipophilicity and oil-water separation efficiency

Method used

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  • A modified composite fiber membrane for oil-water separation and its preparation method
  • A modified composite fiber membrane for oil-water separation and its preparation method
  • A modified composite fiber membrane for oil-water separation and its preparation method

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 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.

[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 the weight percentage 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 ob...

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Abstract

The invention discloses a modified composite fiber membrane for oil-water separation and a preparation method thereof. A solution containing PAN is mixed with a solution containing MOFs to obtain a casting solution, and the casting solution is electrospun to prepare a base membrane; The base film is dried and coated with fluorosilane vapor to obtain a nanofiber film; the casting solution contains 5-12wt% of PAN, 0.2-1wt% of MOFs, and 87-94.8wt% of polar solvent ; The MOFs are NH 2 ‑UIO‑66(Zr). The preparation method of the present invention is easy to operate and has good film-forming performance. The MOFs material is evenly distributed in the fiber, and the water contact angle on the surface of the film is 150.4°, which reaches the super-hydrophobic condition. The adsorption capacity of the composite fiber film to silicone oil reaches 33.7° g / g, the oil flux to separate dichloromethane under gravity alone is 2286L m ‑2 h ‑1 , the separation efficiency exceeds 99.8%, and the oil flux after ten cycles still remains at 1792L m ‑2 h ‑1 , 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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Patent Type & Authority Patents(China)
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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