A kind of reverse osmosis membrane with polyvinylpyrrolidone surface modification and preparation method thereof

A technology of polyvinylpyrrolidone and reverse osmosis membrane, applied in the direction of reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc., can solve the problem of easy loss of polyvinylpyrrolidone, achieve good anti-pollution performance and low flux drop rate , the effect of mild reaction conditions

Active Publication Date: 2017-06-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method involved in the invention solves the shortcoming that polyvinylpyrrolidone is easily lost in the traditional coating method

Method used

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  • A kind of reverse osmosis membrane with polyvinylpyrrolidone surface modification and preparation method thereof
  • A kind of reverse osmosis membrane with polyvinylpyrrolidone surface modification and preparation method thereof
  • A kind of reverse osmosis membrane with polyvinylpyrrolidone surface modification and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Fix the aromatic polyamide composite reverse osmosis membrane with a size of 15 × 13 cm between two plexiglass frames and a rectangular hollow silica gel pad. The rectangular hollow silica gel pad has the same size as the plexiglass frame, and deionized water and Isopropanol fully rinses the surface of the reverse osmosis membrane;

[0024] (2) Prepare 25 mL of ferric chloride aqueous solution with a concentration of 0.1 mg / mL, quickly pour the aqueous solution on the membrane surface, so that the aqueous solution completely wets the membrane surface;

[0025] (3) Prepare 25 mL of tannic acid aqueous solution with a concentration of 0.2 mg / mL and 25 mL of a polyethyleneimine aqueous solution with a concentration of 0.1 mg / mL, pour it on the reverse osmosis membrane surface containing the ferric chloride aqueous solution, and shake it slowly to make it fully mixed;

[0026] (4) pour off the solution on the membrane surface, fully rinse the membrane surface with deio...

Embodiment 2

[0037] (1) Fix an aromatic polyamide composite reverse osmosis membrane with a size of 30 × 26 cm between two plexiglass frames and a rectangular hollow silica gel pad. The rectangular hollow silica gel pad has the same size as the plexiglass frame. Use deionized water and Isopropanol fully rinses the surface of the reverse osmosis membrane;

[0038] (2) Prepare 75 mL of ferric chloride aqueous solution with a concentration of 0.5 mg / mL, and quickly pour the aqueous solution on the membrane surface so that the aqueous solution completely wets the membrane surface;

[0039] (3) Prepare 75mL concentration of 1.0mg / mL tannic acid aqueous solution and 75mL concentration of 1.2mg / mL polyethylene polyamine aqueous solution, pour it on the reverse osmosis membrane surface containing ferric chloride aqueous solution, shake slowly to make it fully mixed;

[0040] (4) pour off the solution on the membrane surface, fully rinse the membrane surface with deionized water;

[0041](5) Prep...

Embodiment 3

[0047] (1) Fix the aromatic polyamide composite reverse osmosis membrane with a size of 50 × 40 cm between two plexiglass frames and a rectangular hollow silica gel pad. The size of the rectangular hollow silica gel pad is the same as that of the plexiglass frame. Isopropanol fully rinses the surface of the reverse osmosis membrane;

[0048] (2) Prepare 180 mL of ferric chloride aqueous solution with a concentration of 0.4 mg / mL, quickly pour the aqueous solution on the membrane surface, so that the aqueous solution completely wets the membrane surface;

[0049] (3) Prepare 180mL concentration of 0.6mg / mL tannic acid aqueous solution and 180mL concentration of 0.90mg / mL tetraethylenepentamine aqueous solution, pour it on the reverse osmosis membrane surface containing ferric chloride aqueous solution, shake slowly to make it fully mixed;

[0050] (4) pour off the solution on the membrane surface, fully rinse the membrane surface with deionized water;

[0051] (5) Prepare 200...

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Abstract

The invention discloses an anti-pollution reverse osmosis membrane surface-modified with polyvinylpyrrolidone and a preparation method thereof. The present invention utilizes the strong adhesion of the complex formed by tannic acid and ferric chloride on the surface of the aromatic polyamide composite reverse osmosis membrane, and uses the complex as an intermediate layer to introduce polyvinylpyrrolidone into the reverse osmosis membrane surface. Polyvinylpyrrolidone is firmly attached to the membrane surface through the strong hydrogen bond formed by a large number of lactam structures on its polymer chain and a large number of polyphenolic groups on the middle layer. The invention solves the shortcoming that polyvinylpyrrolidone is easily lost in the traditional coating method. The prepared polyvinylpyrrolidone surface-modified reverse osmosis membrane has significantly improved hydrophilicity, significantly reduced surface negative charge density, and has good anti-pollution performance against pollutants such as proteins and polysaccharides. The invention has the advantages of wide sources of raw materials, mild reaction conditions and simple method.

Description

technical field [0001] The invention relates to a polyvinylpyrrolidone surface-modified reverse osmosis membrane and a preparation method thereof, belonging to the field of composite reverse osmosis membrane preparation. Background technique [0002] Reverse osmosis membrane technology is currently the mainstream seawater and brackish water desalination method. However, the development of reverse osmosis membrane technology has long been constrained by the problem of membrane fouling. During the reverse osmosis desalination process, the pollutants in the raw material solution will adhere to the surface of the reverse osmosis membrane through deposition or adsorption, resulting in a decrease in the membrane permeate flux and an increase in cleaning frequency, thereby increasing the operating cost of the reverse osmosis process. Studies have shown that improving the hydrophilicity of the membrane surface can effectively improve the anti-pollution performance of the reverse os...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00B01D61/02
Inventor 王志邬军辉王纪孝王世昌
Owner TIANJIN UNIV
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