Method for preparing ultra-filtration membranes with high selectivity and high permeability

A high-permeability, high-selectivity technology, applied in ultrafiltration, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as limiting the simultaneous improvement of ultrafiltration membrane permeability and selectivity, and achieve high selectivity and permeability, reducing pore size, increasing pore density

Inactive Publication Date: 2018-10-16
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of film formation, selecting solvents and non-solvents with different affinity, changing the temperature, selecting different types of porogens and changing the molecular weight and addition amount of porogens can change the pore parameters of ultrafiltration membranes, but in general , there is a certain coupling between the pore density and pore size of the ultrafiltration membrane, that is, the increase of the pore density is often accompanied by the increase of the pore size, which limits the simultaneous improvement of the permeability and selectivity of the ultrafiltration membrane.

Method used

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  • Method for preparing ultra-filtration membranes with high selectivity and high permeability
  • Method for preparing ultra-filtration membranes with high selectivity and high permeability
  • Method for preparing ultra-filtration membranes with high selectivity and high permeability

Examples

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Effect test

Embodiment 1

[0020] Embodiment 1, prepare ultrafiltration membrane with high selectivity and high permeability concurrently, the steps are as follows:

[0021] Step 1. Configuration of the casting solution: add 160mg of polyethersulfone (6020P type), 160mg of Pluronic F127 and 680mg of dimethylformamide into a round bottom flask, heat and stir in a water bath at 70°C for 4h, then statically defoam for 2h ,stand-by.

[0022] Step 2, configuration of the coagulation bath: add an aqueous solution of tannic acid with a mass volume concentration of 10 g / L into a beaker, stir at room temperature for 1 hour, and set aside.

[0023] Step 3. Solidify and form a film: Cool the casting solution configured in step 1 to room temperature, pour it on a glass plate and scrape it into a liquid film with a thickness of about 200 μm, and put it in the coagulation bath configured in step 2 at a constant temperature of 25°C to continue 10 minutes to solidify into a film.

[0024] Step 4, post-treatment: imme...

Embodiment 2

[0026] Embodiment 2, preparation has the ultrafiltration membrane of high selectivity and high permeability concurrently, and its preparation process is basically the same as embodiment 1, and difference only is: in step 2, the mass volume concentration of tannic acid aqueous solution is 20g / L, and final preparation Obtain ultrafiltration membrane 2.

[0027] figure 2 It is the three-cycle flux change diagram of ultrafiltration membrane 2 prepared in Example 2 of the present invention for filtering 1 g / L bovine serum albumin aqueous solution. The content of each cycle is: pure water (30min)-bovine serum albumin aqueous solution (60min)-cleaning (10min, this time is not marked in the figure)-pure water (30min).

[0028] The ultrafiltration membrane 2 made by embodiment 2 has a rejection rate of 99.0% to bovine serum albumin (1g / L), and a retention rate of 90.9% to dextran (1g / L, molecular weight 150kDa); The specific flux is 412Lm -2 h -1 bar -1 , the specific flux of fil...

Embodiment 3

[0029] Embodiment 3, preparation has the ultrafiltration membrane of high selectivity and high permeability concurrently, and its preparation process is basically the same as embodiment 1, and difference only is: in step 2, the mass volume concentration of tannic acid aqueous solution is 30g / L, and final preparation Obtain ultrafiltration membrane 3.

[0030] The ultrafiltration membrane 3 made by embodiment 3 has a rejection rate of 99.0% to bovine serum albumin (1g / L), and a retention rate of 91.7% to dextran (1g / L, molecular weight 150kDa); The specific flux is 394Lm -2 h -1 bar -1 , the specific flux of filtering 1g / L bovine serum albumin aqueous solution is 281Lm -2 h -1 bar -1 , the flux recovery rate was 95.9% after operating for 60 minutes and washing with pure water shear flow for 10 minutes.

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Abstract

The invention discloses a method for preparing ultra-filtration membranes with high selectivity and high permeability. The method includes heating and stirring polyethersulfone, pluronic F127 and dimethylformamide in water bath at the temperature of 70 DEG C according to a mass ratio of 20:20:85 for 4 h, and carrying out static defoaming for 2 h to obtain casting membrane solution; adding tannic acid aqueous solution with certain concentration into a beaker, and stirring the tannic acid aqueous solution at the room temperature for 1 h to be used as coagulating bath; cooling the casting membrane solution until the temperature of the casting membrane solution reaches the room temperature, then pouring the casting membrane solution on glass plates, forming liquid membranes with the thicknesses of approximately 200 micrometers by means of scraping, placing the liquid membranes in the coagulating bath at the constant temperature of 25 DEG C and carrying out continuous solidification and membrane formation for 10 minutes; continuously immersing obtained membranes in sodium hydroxide solution for 12 h, and continuously immersing the membranes in ionized water for 24 h to obtain the ultra-filtration membranes with the high selectivity and the high permeability. The potential of hydrogen of the sodium hydroxide solution is 12. The method has the advantages that hole parameters of the ultra-filtration membranes can be optimized by the aid of interfacial assembly of tannic acid and the pluronic F127 in membrane formation procedures, in other words, the hole density can be increased, and the hole sizes can be reduced, so that the ultra-filtration membranes prepared by the aid of the method are high in selectivity and permeability.

Description

technical field [0001] The invention relates to a preparation method of an ultrafiltration membrane with high selectivity and high permeability, and belongs to the technical field of ultrafiltration membrane preparation. Background technique [0002] Membrane separation is a high-tech covering chemical engineering, material science, process engineering and other disciplines. It is a selective separation medium for a certain component in the mixture. A certain driving force is applied on both sides of the membrane to make the mixture Components are selectively transferred from one side of the membrane to the other. Ultrafiltration membrane is one of the membrane separation technologies that use pressure as the driving force to separate macromolecules and small molecules. Under a certain pressure, when the stock solution flows through the surface of the membrane, many tiny micropores densely covered on the surface of the ultrafiltration membrane only allow water and small mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D67/00B01D19/02
CPCB01D19/02B01D61/145B01D67/0011B01D67/0013B01D67/0016B01D67/0088B01D2323/28
Inventor 姜忠义贺明睿张润楠
Owner TIANJIN UNIV
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