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Preparation method for polydopamine-modified polyamide composite forward osmosis membrane

A technology of polydopamine and forward osmosis membrane, which is applied in semipermeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., can solve the problem of reducing the driving force of the osmosis process, and achieve low anti-salt diffusion flux , increase the interception capacity, and the effect of large permeation flux

Inactive Publication Date: 2015-12-23
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the concentration polarization phenomenon existing inside the porous support layer greatly reduces the driving force of the percolation process

Method used

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  • Preparation method for polydopamine-modified polyamide composite forward osmosis membrane
  • Preparation method for polydopamine-modified polyamide composite forward osmosis membrane

Examples

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example

[0018] A kind of example of the preparation method of polydopamine modified polyamide composite forward osmosis membrane of the present invention, its specific method comprises the following steps:

[0019] (1) Preparation of support layer: Dissolve 16g of polysulfone in 83.75g of N-methylpyrrolidone, add 0.25g of polyvinylpyrrolidone, stir at 70°C for 4h, let stand for more than 12h to completely defoam, and obtain the cast film liquid, and then the polymer casting liquid is prepared into a support layer in the form of a flat film by the immersion-precipitation phase inversion method;

[0020] (2) Preparation of a polydopamine-modified support layer: dissolving dopamine with a mass fraction of 0.1% in a tris-HCl solution at pH=8.5 to form a dopamine tris-HCl solution, and then the support layer prepared in step (1) layer into the dopamine tris-HCl solution configured above, and reacted for 1 hour at 25°C under unsealed conditions to obtain a polydopamine-modified support laye...

example 2

[0029] A kind of example of the preparation method of polydopamine modified polyamide composite forward osmosis membrane of the present invention, its specific method comprises the following steps:

[0030] (1) Preparation of support layer: Dissolve 14g of polysulfone in 85.75g of N-methylpyrrolidone, add 0.25g of polyvinylpyrrolidone, stir at 70°C for 6h, and let the obtained casting solution stand for more than 12h to defoam Completely, the casting solution obtained, and then the polymer casting solution is prepared into a support layer in the form of a flat film by immersion-precipitation phase inversion method;

[0031] (2) Preparation of a polydopamine-modified support layer: dissolving dopamine with a mass fraction of 0.2% in a tris-HCl solution with a pH of 8.5 to form a dopamine tris-HCl solution, and then the support layer prepared in step (1) layer into the dopamine tris-HCl solution configured above, and reacted for 1 hour at 25°C under unsealed conditions to obtain...

example 3

[0035] A kind of example of the preparation method of polydopamine modified polyamide composite forward osmosis membrane of the present invention, its specific method comprises the following steps:

[0036] (1) Preparation of support layer: Dissolve 18g of polysulfone in 82.5g of N,N-dimethylformamide, add 0.5g of polyvinylpyrrolidone, stir at 50°C for 8h, let it stand for more than 12h to completely defoam, The obtained casting solution is prepared into a support layer in the form of a flat film by the polymer casting solution by immersion-precipitation phase inversion method;

[0037] (2) Preparation of a polydopamine-modified support layer: dissolving dopamine with a mass fraction of 0.05% in a tris-HCl solution at pH=8.5 to form a dopamine tris-HCl solution, and then the support layer prepared in step (1) layer into the dopamine tris-HCl solution configured above, and reacted for 2 hours under non-sealed conditions at 25°C to obtain a polydopamine-modified support layer; ...

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Abstract

The invention relates to a preparation method for a polydopamine-modified polyamide composite forward osmosis membrane. The preparation method comprises the following steps: (1) a supporting layer is prepared; (2) the surface of the supporting layer is modified by polydopamine coating; (3) a polyamide separation layer is prepared on the surface of the modified supporting layer, and thereby the polydopamine-modified polyamide composite forward osmosis membrane is obtained. The polydopamine-modified polyamide composite forward osmosis membrane prepared by the preparation method has the advantages of hydrophilcity, large pure water permeation flux and small reverse salt diffusion flux, and is applicable to the field of water treatment such as sea water desalination.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a preparation method of a polydopamine-modified polyamide composite forward osmosis membrane. Background technique [0002] With the rapid growth of the world's population, the shortage of water resources and the deterioration of water quality have become an important factor that threatens and restricts the survival and development of all human beings. How to extract fresh water from seawater cheaply has always been an important scientific and technological issue that people care about. At present, reverse osmosis membrane treatment technology is widely used in seawater desalination. However, this pressure-driven membrane process requires a large external pressure, high energy consumption, and easy to cause membrane fouling. Forward osmosis is a new type of membrane separation technology. This technology uses the osmotic pressure between the raw material liquid and the draw liquid...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D67/00B01D69/12B01D61/00C02F1/44
CPCY02A20/131
Inventor 黄阳波于萍罗运柏
Owner WUHAN UNIV
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