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A magnetically responsive oil-water separation membrane and its preparation method and self-cleaning method

An oil-water separation membrane and self-cleaning technology, applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problems of no anti-pollution effect and no attention to anti-pollution, achieve good oil-water separation effect and good application Foreground, to achieve the effect of self-cleaning

Active Publication Date: 2021-08-03
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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  • A magnetically responsive oil-water separation membrane and its preparation method and self-cleaning method
  • A magnetically responsive oil-water separation membrane and its preparation method and self-cleaning method
  • A magnetically responsive oil-water separation membrane and its preparation method and self-cleaning method

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, place in a hydrothermal reaction kettle and heat at 200°C for 10h to obtain ferroferric oxide magnetic particles with an average particle size of 300nm;

[0052] Prepare 2 mg / 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 the base film

[0054] The polyacrylonitrile membrane is sequentially treated with sodium hydroxide concentration 1mol / L, room temperature, modification time 40min; hydrochloric acid concentration 0.1mol / L, room temperature, modification time 40min, 2g thionyl chloride steam (100°C) for 20min, to obtain Modified base film;

[0055] (3) Preparat...

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, under the protection of nitrogen, add sodium hydroxide dropwise, stir vigorously, and react for 60min to obtain ferroferric oxide magnetic particles with an average particle size of 500nm;

[0061] Configure 2 mg / mL dopamine TRIS solution, soak the magnetic nanoparticles in it, react at room temperature for 24 hours, then configure 0.5% γ-aminopropyltriethoxysilane ethanol aqueous solution, soak the dopamine-modified magnetic nanoparticles, Normal temperature for 24 hours to obtain magnetic composite nanoparticles;

[0062] (2) Modification of the base film

[0063] The polyacrylonitrile / polymethyl methacrylate film is successively carried out sodium hydroxide concentration 1mol / L, room temperature, modification...

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, preparing ferroferromagnetic particles with an average particle diameter 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 the base film

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

[0073] (3) Preparation of Magnetic Response Oil-Water Separation Membrane

[0074] Soak the modified polyamide membrane in a 75% ethanol solution of 20% magnetic composite nanoparticles, add 1 g of carbodiimide, and treat for 2 hours to obtain a magnetic response oil-water separation membrane.

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Abstract

The invention provides a magnetic response oil-water separation membrane and its preparation method and self-cleaning method. The magnetic response oil-water separation membrane comprises a base film and magnetic composite nanoparticles chemically grafted on the surface of the base film. The oil-water separation membrane provided by the invention can realize the self-cleaning of the surface of the membrane by utilizing the periodical transformation of the external magnetic field; at the same time, the oil-water separation membrane provided by the invention can well prevent the oil macromolecules from contacting the membrane contact channel to pollute the pores, so that the The oil-water separation membrane maintains a certain membrane flux and a 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 magnetic response oil-water separation membrane, a preparation method thereof and a self-cleaning method, in particular to a magnetic response oil-water separation membrane for emulsified oil-water separation, a preparation method thereof and a self-cleaning method. Background technique [0002] The discharge of oily sewage in production and life has caused increasingly serious pollution to water bodies. The sewage discharged in production and life mainly includes oily sewage and watery waste oil. Therefore, the separation of oil and water is widely used in social production and people's daily life. need. [0003] Polymer membrane separation technology is a new type of separation technology. It has simple processing process, low energy consumption and easy automatic control. It is widely used in the fields of drinking water purification, wastewater treatment and material separ...

Claims

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Application Information

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Patent Type & Authority Patents(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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