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Magnetic response oil-water separation membrane, preparation method and self-cleaning method thereof

An oil-water separation membrane and magnetic response technology, which is applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problems of not having anti-pollution effect and not paying attention to anti-pollution, so as to avoid the deterioration of application effect and good Application prospects, effects of avoiding oxidation or contamination

Active Publication Date: 2020-06-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN108840400A discloses a magnetic oil-water separation membrane. The magnetic oil-water separation membrane adopts waste solvent-induced phase separation and foaming technology and a two-step method to prepare a polyimide composite microporous film, which is prepared by surface silanization. The oil-water separation membrane provided by the patent application can achieve oil-water separation, but it does not pay attention to its anti-fouling
CN110424099A discloses a multi-stage composite nanofiber membrane used for oil-water separation and its preparation method. The preparation method is to dissolve the polymer in a solvent to obtain a spinning solution; electrospinning the spinning solution to obtain polymer nanofibers membrane; the polymer nanofiber membrane is modified to obtain a modified nanofiber membrane, wherein the modification treatment is acid treatment or alkali treatment; after the modified nanofiber membrane is immersed in a phytic acid solution for a period of time, metal ions are added After soaking in the solution for a period of time, a multi-level composite nanofiber membrane is obtained. This patent application utilizes phytic acid and metal ions to form an antibacterial super-hydrophilic nano-level structure in situ, which can improve the oil-water separation efficiency and the number of repeated uses, but it still does not Has a certain anti-pollution effect

Method used

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  • Magnetic response oil-water separation membrane, preparation method and self-cleaning method thereof
  • Magnetic response oil-water separation membrane, preparation method and self-cleaning method thereof
  • Magnetic response oil-water separation membrane, preparation method and self-cleaning method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A magnetic response oil-water separation membrane, the preparation method is as follows:

[0050] (1) Preparation of magnetic composite nanoparticles

[0051] Dissolve 8.2g of sodium acetate and 2.7g of ferric chloride in 120mL of ethylene glycol at the same time, stir evenly, and place it in a hydrothermal reaction kettle at 200°C for heating and heat preservation for 10h to obtain ferroferric oxide magnetic particles with an average particle size of 300nm;

[0052] Prepare 2mg / mL dopamine TRIS solution, soak the magnetic nanoparticles in it, and react at room temperature for 24 hours to obtain magnetic composite nanoparticles;

[0053] (2) Modification of base film

[0054] The polyacrylonitrile membrane was successively treated with sodium hydroxide concentration of 1 mol / L, room temperature, and modification time of 40 minutes; hydrochloric acid concentration of 0.1 mol / L, room temperature, modification time of 40 minutes, and 2 g of thionyl chloride steam (100 ° C...

Embodiment 2

[0058] A magnetic response oil-water separation membrane, the preparation method is as follows:

[0059] (1) Preparation of magnetic composite nanoparticles

[0060] Dissolve 2g of ferrous chloride and 5g of ferric chloride in double distilled water at the same time, add sodium hydroxide dropwise under nitrogen protection, stir vigorously, and react for 60min to obtain ferric oxide magnetic particles with an average particle size of 500nm;

[0061] Prepare 2 mg / mL dopamine TRIS solution, soak the magnetic nanoparticles in it, react at room temperature for 24 hours, and then configure a 0.5% ethanol aqueous solution of γ-aminopropyltriethoxysilane, soak the dopamine-modified magnetic nanoparticles in the meantime, At room temperature for 24h, magnetic composite nanoparticles were obtained;

[0062] (2) Modification of base film

[0063] The polyacrylonitrile / polymethyl methacrylate membrane was successively subjected to sodium hydroxide concentration of 1mol / L, room temperatu...

Embodiment 3

[0067] A magnetic response oil-water separation membrane, the preparation method is as follows:

[0068] (1) Preparation of magnetic composite nanoparticles

[0069] Referring to Example 1, the preparation of ferric oxide magnetic particles with an average particle size of 20 nm;

[0070] Prepare an ethanol solution of oleic acid with a concentration of 20%, soak the magnetic nanoparticles in it, and react at room temperature for 12 hours to obtain magnetic composite nanoparticles;

[0071] (2) Modification of base film

[0072] Prepare a 3mg / mL dopamine TRIS solution, soak the polyimide film in it, and react at room temperature for 12 hours to obtain a modified base film;

[0073] (3) Preparation of magnetically responsive oil-water separation membrane

[0074] The modified polyamide membrane was soaked in a 75% ethanol solution of magnetic composite nanoparticles with a concentration of 20%, 1 g of carbodiimide was added, and treated for 2 hours to obtain a magnetically r...

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Abstract

The invention provides a magnetic response oil-water separation membrane, a preparation method and a self-cleaning method thereof. The magnetic response oil-water separation membrane comprises a basemembrane and magnetic composite nanoparticles chemically grafted on the surface of the base membrane. The oil-water separation membrane provided by the invention can realize self-cleaning of the membrane surface by utilizing periodic transformation of an external magnetic field; meanwhile, the oil-water separation membrane provided by the invention can well prevent oil macromolecules from being incontact with a membrane contact channel to pollute pore channels, so that the oil-water separation membrane can keep a certain membrane flux and stable separation efficiency, and has a good application prospect.

Description

technical field [0001] The invention belongs to the field of oil-water separation, and relates to a magnetically responsive oil-water separation membrane and a preparation method and self-cleaning method thereof, in particular to a magnetically-responsive oil-water separation membrane for emulsified oil-water separation and its preparation method and self-cleaning method. Background technique [0002] The discharge of oily sewage in production and life has caused increasingly serious water pollution. The sewage discharged in production and life mainly includes oily sewage and water-containing waste oil. Therefore, the separation of oil and water has a wide range of applications in social production and people's daily life. need. [0003] Polymer membrane separation technology is a new type of separation technology. It has simple treatment process, low energy consumption and easy automatic control. It is widely used in the fields of drinking water purification, wastewater tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/64B01D71/42B01D71/38B01D71/16B01D69/02B01D67/00B01D65/02B01D17/022
CPCB01D17/02B01D65/02B01D67/0002B01D69/02B01D71/16B01D71/38B01D71/42B01D71/64B01D71/68B01D2325/46
Inventor 李望良王雅洁李蕾
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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