Anti-pollution antibacterial PTFE oil-water separation membrane and preparation method thereof

An oil-water separation membrane, anti-pollution technology, applied in semi-permeable membrane separation, chemical instruments and methods, osmotic/dialysis water/sewage treatment, etc.

Active Publication Date: 2021-07-06
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these treatment methods have greatly improved the anti-adhesion and water wettability of the membrane surface, on the one hand, the above-mentioned methods cannot simultaneously endow the membrane material with anti-organic pollution and anti-biological pollution (bactericidal) properties, and on the other hand, often require special equipment

Method used

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  • Anti-pollution antibacterial PTFE oil-water separation membrane and preparation method thereof
  • Anti-pollution antibacterial PTFE oil-water separation membrane and preparation method thereof
  • Anti-pollution antibacterial PTFE oil-water separation membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Synthesis of acrylamide thiolactone:

[0045] A mixed solution of DL-homocysteine ​​thiolactone hydrochloride (7.68g, 50mmol), 200mL ethyl acetate and water (1:1 by volume) was added to the three-necked flask, and placed in an ice-water bath Then add sodium bicarbonate (18.9g, 225mmol) and stir for 30min; then add acryloyl chloride (10.1g, 110mmol) dropwise and stir for 30min; remove the ice-water bath, react at room temperature for 12h, and use the obtained product 200mL of 1mol / L sodium chloride solution was washed and extracted three times with ethyl acetate (200mL / time), and the organic layer was taken each time; finally, the extracted organic layer liquid was dried with anhydrous sodium sulfate, rotary evaporated, and the obtained crude The product was crystallized and purified in dichloromethane to obtain acrylamide thiolactone (TlaAm) as a white solid;

[0046] (2) Synthesis of P (DMAEMA-co-TlaAm) copolymer:

[0047] Dimethylaminoethyl methacrylate (DMAEMA)...

Embodiment 2

[0056] The copolymer P (DMAEMA-co-TlaAm) prepared based on embodiment 1 prepares antifouling and antibacterial oil-water separation membrane, and its specific preparation steps are as follows:

[0057] Step 1, the polytetrafluoroethylene membrane was ultrasonically cleaned with ethanol and acetone respectively for 15 minutes; then immersed in a solution of 2 g / L dopamine hydrochloride / Tris (pH=8.5, 50 mM) and placed on a shaker at room temperature Shake at a constant speed for 4 hours; then, rinse with deionized water three times repeatedly, and place on a shaker in pure water for 10 minutes; take it out, and dry it in a vacuum at 40°C to constant weight, and the deposited film is PTFE-PDA- 4;

[0058] Step 2, glucosamine (0.0216g, 0.12mmol) and copolymer P (DMAEMA-co-TlaAm) (1.446g, 0.06mmol) are dissolved in the Tris solution of 50mL, then the deposited film prepared by step 1 is immersed in The solution was placed on a shaker and shaken at room temperature for 24 hours; th...

Embodiment 3

[0061] The copolymer P (DMAEMA-co-TlaAm) prepared based on embodiment 1 prepares antifouling and antibacterial oil-water separation membrane, and its specific preparation steps are as follows:

[0062] Step 1, the polytetrafluoroethylene membrane was ultrasonically cleaned with ethanol and acetone respectively for 15 minutes; then immersed in a solution of 2 g / L dopamine hydrochloride / Tris (pH=8.5, 50 mM) and placed on a shaker at room temperature Shake at a constant speed for 12 hours; then, rinse with deionized water three times repeatedly, and place on a shaker in pure water for 10 minutes; take it out, and dry it in a vacuum at 40°C to constant weight, and the deposited film is PTFE-PDA- 12;

[0063] Step 2, glucosamine (0.0216g, 0.12mmol) and copolymer P (DMAEMA-co-TlaAm) (1.446g, 0.06mmol) are dissolved in the Tris solution of 50mL, then the deposited film prepared by step 1 is immersed in The solution was placed on a shaker and shaken at room temperature for 24 hours; ...

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Abstract

The invention discloses an anti-pollution antibacterial PTFE oil-water separation membrane and a preparation method thereof. The preparation method comprises the following steps: 1) reacting DL-homocysteine thiolactone hydrochloride with acryloyl chloride to prepare thiolactone acrylamide; 2) preparing a random copolymer of dimethylaminoethyl methacrylate and thiolactone acrylamide, wherein the number-average molecular weight of the copolymer is 20000 to 50000 Da; 3) immersing the clean polytetrafluoroethylene membrane into a catecholamine / trihydroxymethyl aminomethane solution to deposit for 4 to 24 hours, and then cleaning and drying to obtain a deposited membrane; and 4) dissolving glucosamine and the copolymer into a trihydroxymethyl aminomethane solution, immersing the deposited membrane into the solution for 24 hours, and then cleaning and drying to obtain a modified membrane. The anti-pollution antibacterial PTFE oil-water separation membrane has excellent hydrophilic performance and antibacterial performance, the application range of the polytetrafluoroethylene membrane is expanded, a new thought is provided for functional modification of the surface of the polymer membrane, the operation process is simple and convenient, and special equipment is not needed.

Description

technical field [0001] The invention relates to the technical field of oil-water separation, in particular to an anti-pollution and antibacterial PTFE oil-water separation membrane and a preparation method thereof. Background technique [0002] With the growth of global energy demand, the frequent occurrence of oil spill accidents and the rapid increase of industrial oily wastewater discharge, as well as the vigorous development of industries such as oil, natural gas, pharmaceutical, metallurgy and food, a large amount of oily wastewater needs to be treated. On the other hand, the rapidly growing population leads to increasing scarcity of water resources. Therefore, it is of great significance to further treat oily wastewater to achieve the recovery and reuse of water resources. Membrane separation technology has shown great application prospects in the field of oil-water separation because of its high flux, good retention performance and wide application range. [0003] H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D67/00C02F1/44
CPCB01D71/36B01D67/0006C02F1/44B01D2325/48B01D2325/36
Inventor 孟建强李旭东叶剑龙
Owner TIANJIN POLYTECHNIC UNIV
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