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Anti-adhesion biological pollution prevention reverse osmosis membrane prepared through surface modification and preparation method

An anti-biological fouling, reverse osmosis membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc. The effect of anti-biological pollution performance, low cost and simple preparation process

Active Publication Date: 2018-11-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Anti-adhesion biological pollution prevention reverse osmosis membrane prepared through surface modification and preparation method
  • Anti-adhesion biological pollution prevention reverse osmosis membrane prepared through surface modification and preparation method
  • Anti-adhesion biological pollution prevention reverse osmosis membrane prepared through surface modification and preparation method

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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 with a concentration of 2.0 wt%; immerse the surface of the nascent reverse osmosis membrane in the 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] At 1.55MPa, 25°C, 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, drain the contaminated liquid in the test system, and rinse the diaphragm with 2000mg / L sodium chloride aqueous solution for 40min at 0.62MPa, 25°C, and...

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Abstract

The invention relates to an anti-adhesion biological pollution prevention reverse osmosis membrane prepared through surface modification and a preparation method. The preparation method comprises thefollowing steps: preparing an aqueous solution containing biguanidyl chitosan oligosaccharide; soaking the surface of a primary reverse osmosis membrane in the solution for reacting; drying the membrane to obtain the anti-adhesion biological pollution prevention reverse osmosis membrane, wherein the reverse osmosis membrane is prepared by connecting residual acyl chloride groups on the surface ofan aromatic polyamide composite reverse osmosis membrane and the biguanidyl chitosan oligosaccharide. The preparation method is simple in preparation process. As proved by the results of an anti-adhesion experiment and a biological pollution prevention experiment, a modified membrane has high anti-adhesion performance and biological pollution prevention performance. The preparation method is not limited to graft modification of the aromatic polyamide composite reverse osmosis membrane, and an anti-adhesion biological pollution prevention surface-modified polymer membrane can be prepared by modifying the surfaces of other polymer membranes which contain acyl chloride groups on the surface.

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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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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