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High-flux oil-water separation COF membrane as well as preparation method and application thereof

An oil-water separation, high-throughput technology, applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problems of cumbersome synthesis process of hydrophobic COF membrane, and achieve the improvement of low mechanical strength, high separation flux, high The effect of self-cleaning ability

Pending Publication Date: 2021-06-11
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention improves the cumbersome synthesis process of the existing hydrophobic COF membrane, and has broad development prospects in the application of various oil-containing industrial wastewater and domestic sewage, as well as offshore oil pollution.

Method used

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  • High-flux oil-water separation COF membrane as well as preparation method and application thereof
  • High-flux oil-water separation COF membrane as well as preparation method and application thereof
  • High-flux oil-water separation COF membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of superhydrophobic COF1 powder:

[0043] Weigh 30.2mg i Pr-TAM and 15.5 mg of TFTA were dispersed in a mixed solvent of 0.1 mL of DMA and 1.5 mL of isopropanol. After ultrasonic dispersion for 5 minutes, 0.4 mL of 3M acetic acid was added. The above suspension was then added to glass test tubes, snap frozen at 77k (liquid nitrogen bath), evacuated and sealed. After slowly returning to room temperature, it was heated at 120 °C for 3 d. After the reaction, the solid was filtered out, washed with tetrahydrofuran in a Soxhlet extractor for 24 hours to remove unreacted monomers, and finally dried under vacuum at 100 °C for 8 hours to obtain superhydrophobic COF1 solid powder.

Embodiment 2

[0045] Preparation of superhydrophobic COF2 powder:

[0046] Weigh 33.0mg F- i Pr-TAM and 15.5 mg of TFTA were dispersed in 0.3 mL of isopropanol solvent, and after ultrasonic dispersion for 5 minutes, 1.2 mL of pure acetic acid was added. The above suspension was then added to glass test tubes, snap frozen at 77k (liquid nitrogen bath), evacuated and sealed. After slowly returning to room temperature, it was heated at 120 °C for 3 d. After the reaction, the solid was filtered out, washed with tetrahydrofuran in a Soxhlet extractor for 24 hours to remove unreacted monomers, and finally dried under vacuum at 100 °C for 8 hours to obtain superhydrophobic COF2 solid powder.

Embodiment 3

[0048] Functional modification of stainless steel mesh:

[0049] Use 1.0M hydrochloric acid and 1.0M sodium hydroxide solution for 7×7cm 2 Large and small stainless steel mesh is cleaned and dried after cleaning. Then, the toluene solution of 3.0 wt.% APTES was treated at 110 °C for 2 h to modify amino groups on the surface of the stainless steel mesh.

[0050] The amino-modified stainless steel mesh was further functionalized with a dioxane solution of 0.27wt% TFTA, treated at 80°C for 2 h, and the surface of the stainless steel mesh was modified with aldehyde groups, that is, the functionalization was completed.

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Abstract

The invention relates to a high-flux oil-water separation COF membrane and a preparation method and application thereof.The preparation method comprises the following steps: (1) placing cleaned stainless steel mesh in a 3-aminopropyltriethoxysilane solution for a reaction to prepare an amino-modified stainless steel mesh; (2) putting the amino-modified stainless steel mesh in a linear bidentate dialdehyde solution for a reaction to prepare an aldehyde-modified stainless steel mesh. and 3) placing the aldehyde modified stainless steel mesh in a COF mother solution, adopting a secondary growth method to obtain a super-hydrophobic COF membrane supported by the stainless steel mesh, and performing post-treatment to obtain the high-flux oil-water separation COF membrane. Compared with the prior art, the prepared super-hydrophobic COF membrane shows high flux and separation efficiency in the oil-water separation process, has high water pressure tolerance and self-cleaning capacity, solves the problem that an existing hydrophobic COF membrane is tedious in synthesis process, and has wide development prospects.

Description

technical field [0001] The invention belongs to the technical field of oil-water separation membranes, and relates to a high-flux oil-water separation COF membrane and a preparation method and application thereof. Background technique [0002] Compared with traditional distillation, evaporation or adsorption separation processes, membrane separation technology has the advantages of low energy consumption, simple operation process, wide application range and strong selectivity. Since the 1960s, the discovery of cellulose acetate membranes with high flux and high desalination rate has brought membrane technology into a period of rapid development and gradually moved towards commercial application. A large amount of oily sewage is often produced in industrial production and people's lives. The use of membrane separation technology to achieve oil-water separation is one of the efficient separation methods. The core task of membrane separation technology is the development and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D69/02B01D67/00C02F1/40C02F1/44
CPCB01D71/06B01D69/02B01D67/0079C02F1/40C02F1/44B01D2325/24B01D2325/38
Inventor 崔勇刘玉豪袁晨刘燕
Owner SHANGHAI JIAO TONG UNIV
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