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Surface modification to prepare anti-adhesion and anti-biological fouling reverse osmosis membrane and preparation method

A technology of anti-biological fouling and reverse osmosis membrane, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of reduced membrane rejection rate, reduced membrane permeation performance, and reduced water flux

Inactive Publication Date: 2021-07-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a high concentration of PHMG will reduce the permselective performance of the membrane.
Coating of PVA-PHMG(95:5) resulted in a 58% reduction in water flux
In addition, coating of PHMG leads to lower membrane rejection

Method used

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  • Surface modification to prepare anti-adhesion and anti-biological fouling reverse osmosis membrane and preparation method
  • Surface modification to prepare anti-adhesion and anti-biological fouling reverse osmosis membrane and preparation method
  • Surface modification to prepare anti-adhesion and anti-biological fouling reverse osmosis membrane and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare an aqueous solution of biguanidinated chitosan oligosaccharide material, the concentration of which is 0.1wt%; immerse the surface of the nascent reverse osmosis membrane in the above solution for 30s; then dry the membrane at a drying temperature of 40°C and a drying time of 1min to obtain Anti-adhesion anti-biofouling reverse osmosis membrane. Electron microscope pictures such as image 3 shown.

[0025] Under the conditions of 1.55MPa, 25°C and cross-flow flow rate of 1.0L / min, the initial permeate flux and salt rejection rate of the modified membrane were 56.28L / (m 2 • h) and 98.92%.

[0026] The membrane was placed in 500ppm bovine serum albumin and lysozyme solution (pH=7.0) and operated continuously for 360min, and then the water flux and rejection rate after membrane fouling were tested. Keep the diaphragm in the membrane tank, drain the contaminated liquid in the test system, and rinse the diaphragm with 2000mg / L sodium chloride aqueous solution for ...

Embodiment 2

[0030] Prepare an aqueous solution of biguanidinated chitosan oligosaccharide material, the concentration of which is 0.3wt%; immerse the surface of the nascent reverse osmosis membrane in the above solution for 80s; then dry the membrane at a drying temperature of 70°C and a drying time of 4 minutes to obtain Anti-adhesion anti-biofouling reverse osmosis membrane. Electron microscope pictures such as Figure 4 shown.

[0031] Under the conditions of 1.55MPa, 25°C and cross-flow flow rate of 1.0L / min, the initial permeate flux and salt rejection rate of the modified membrane were 54.49L / (m 2 • h) and 98.97%.

[0032] The membrane was placed in 500ppm bovine serum albumin and lysozyme solution (pH=7.0) and operated continuously for 360min, and then the water flux and rejection rate after membrane fouling were tested. Keep the diaphragm in the membrane tank, drain the contaminated liquid in the test system, and rinse the diaphragm with 2000mg / L sodium chloride aqueous solutio...

Embodiment 3

[0036] Prepare an aqueous solution of biguanide-based chitosan oligosaccharide material, the concentration of which is 2.0wt%; immerse the surface of the nascent reverse osmosis membrane in the above solution for 120s; then dry the membrane at a drying temperature of 90°C and a drying time of 10 minutes to obtain Anti-adhesion anti-biofouling reverse osmosis membrane. Electron microscope pictures such as Figure 5 shown.

[0037] Under the conditions of 1.55MPa, 25°C, and cross-flow flow rate of 1.0L / min, the initial permeate flux and salt rejection rate of the modified membrane were 59.82L / (m 2 • h) and 98.91%.

[0038] The membrane was placed in 500ppm bovine serum albumin and lysozyme solution (pH=7.0) and operated continuously for 360min, and then the water flux and rejection rate after membrane fouling were tested. Keep the diaphragm in the membrane tank without taking it out, drain the contaminated liquid in the test system, and rinse the diaphragm with 2000mg / L sodiu...

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Abstract

The invention relates to a surface modification to prepare an anti-adhesion and anti-biological pollution reverse osmosis membrane and a preparation method; prepare an aqueous solution containing biguanylated chitosan oligosaccharide; immerse the surface of the nascent reverse osmosis membrane in the solution for reaction; and then dry the membrane , to obtain an anti-adhesion and anti-biological fouling reverse osmosis membrane; the reverse osmosis membrane is composed of the remaining acid chloride groups on the surface of the aromatic polyamide composite reverse osmosis membrane and biguanide-based chitosan oligosaccharide; the preparation process of the present invention is simple, and the anti-adhesion And anti-biofouling experiment results show that the modified membrane has good anti-adhesion and anti-biofouling properties. The present invention is not only limited to the graft modification of the aromatic polyamide composite reverse osmosis membrane, but also can obtain the surface modification of anti-adhesion and anti-biological fouling properties through the surface modification of other polymer membranes containing acid chloride groups. permanent polymer film.

Description

technical field [0001] The invention relates to an anti-adhesion and anti-biological pollution reverse osmosis membrane prepared by surface modification and a preparation method, belonging to the field of composite reverse osmosis membrane preparation. Background technique [0002] As an economical desalination technology, reverse osmosis membrane technology has been widely used in many fields. However, membrane fouling has always hindered the further development and application of reverse osmosis membrane technology. The fouling layer on the membrane surface will have many adverse effects, such as increasing the operating pressure, reducing membrane performance, increasing energy consumption and reducing the service life of the membrane. [0003] In order to reduce membrane fouling, researchers have proposed a series of methods, such as pretreatment, membrane monitoring, membrane cleaning, and the development of new reverse osmosis membranes. Through reasonable pretreatme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/02B01D67/00
CPCB01D67/0093B01D69/02B01D71/56B01D2325/48
Inventor 王志王宠周艺璇王纪孝王世昌
Owner TIANJIN UNIV
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