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Nanofiltration separation membrane and preparation method thereof

A separation membrane and nanofiltration technology, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem that cellulose derivatives are easily degraded by microorganisms, are not resistant to oxidation, and their stability and anti-pollution properties need to be improved and other problems, to achieve the effects of inhibiting membrane fouling, prolonging service life, and improving membrane water permeability

Active Publication Date: 2013-11-27
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyamide has high throughput and high selectivity, but it is not resistant to oxidation; cellulose derivatives are easily degraded by microorganisms, and the nanofiltration membranes of the above materials are directly applied to seawater systems with a wide variety of algae, microorganisms and organic matter. Pollution resistance needs to be improved

Method used

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  • Nanofiltration separation membrane and preparation method thereof
  • Nanofiltration separation membrane and preparation method thereof
  • Nanofiltration separation membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Wash the polyacrylonitrile-based membrane with ethanol and deionized water alternately, then soak it fully in ethanol; dissolve dopa in deionized water, and prepare a dopa solution with a concentration of 2.0mg / L; soak the basement membrane in dopa solution, shaking in a shaking incubator with a rotation speed of 100r / min and a temperature of 35°C for 24h, and then alternately shaking and washing in ethanol and deionized water; Soak in polyethyleneimine for 3 hours, shake and wash in deionized water; then immerse the separation membrane obtained above in 0.5% glutaraldehyde solution at 60° C. for cross-linking for 6 hours; rinse with deionized water to prepare a nanofiltration separation membrane.

[0037] The performance of the separation membrane was measured and the results are as follows. For MgSO 4 Mixed solution with NaCl, the water flux is 30L / m 2 h, the rejection rate of magnesium ions is 72%, the rejection rate of sodium ions is 25%, and the selective rejecti...

Embodiment 2

[0039]Wash the polyacrylonitrile-based membrane with ethanol and deionized water alternately, and fully infiltrate it in ethanol; dopa is dissolved in a Tris-hydrochloric acid buffer solution with a pH of 8.0, and a dopa solution with a concentration of 1.0 mg / L is prepared; Soak the basement membrane in the dopa solution, shake it in a shaking incubator with a rotation speed of 100r / min and a temperature of 35°C for 24h, and then alternately shake and wash it in ethanol and deionized water; put the basement membrane with a polydopa composite layer Soak the membrane in polyethyleneimine at a temperature of 50°C for 3h, and shake and wash it in deionized water; then immerse the separation membrane obtained above in a 0.5% glutaraldehyde solution at 60°C for 6h; rinse with deionized water, and prepare A nanofiltration separation membrane was obtained.

[0040] The performance of the separation membrane was measured and the results are as follows. For MgSO 4 Mixed solution with...

Embodiment 3

[0042] Soak the polyacrylonitrile-based membrane statically in 0.5% NaOH aqueous solution for 4 hours, wash it alternately with ethanol and deionized water, and fully infiltrate it in ethanol; dissolve dopa in a Tris-hydrochloric acid buffer solution with a pH of 8.0, and configure Dopa solution with a concentration of 2.0mg / L; soak the basement membrane in the dopa solution, add 0.2g of zinc powder, shake in a shaking incubator with a rotation speed of 100r / min and a temperature of 35°C for 24h, and then in ethanol and Alternate shaking and cleaning in deionized water; soak the base membrane with polydopa composite layer in polyethyleneimine at a temperature of 50°C for 6h, shake and wash in deionized water; then immerse the separation membrane obtained above in a 60°C Cross-link in 1.0% glutaraldehyde solution for 12 hours; rinse with deionized water to prepare nanofiltration separation membrane.

[0043] The performance of the separation membrane was measured and the result...

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Abstract

The invention relates to a nanofiltration separation membrane which is prepared by dopa and / or dopamine through stem grafting and crosslinking after being stably auto-polymerized on the surface of a basement membrane. A poly-dopa or poly-dopamine composite layer which can be firmly combined with the basement membrane is obtained based on the principle of biological adhesion, and the composite layer is directly reacted with amino or sulfydryl in a long-chain molecule for crosslinking so as to prepare a series of nanofiltration separation membranes with different surface roughnesses, modified layer thicknesses, membrane pore diameters and hydrophilias. The nanofiltration separation membrane has the following advantages: (1) the composite strength between the composite layer and the basement membrane is large; (2) the seawater erosion resistant and hydrolytic resistance performances are strong so that the service life of the membrane is greatly prolonged; (3) the surface is smooth and uniform; (4) the surface hydrophilia is strong so that the permeability performance of the membrane can be improved; (5) the antibiosis is strong so that the pollution of the microbial membrane can be restrained; (6) the water flux is large and the separation efficiency of divalent ions is high; and (7) the process is simple, the condition is mild, and the realization is easy.

Description

technical field [0001] The invention belongs to the field of preparing separation membrane composite materials, in particular to a nanofiltration separation membrane and a preparation method thereof, that is, nanofiltration separation using dopa and / or dopamine self-polymerization coating as a composite layer under grafting and crosslinking conditions Membrane and its preparation method. Background technique [0002] Nanofiltration membrane has nanoscale membrane pores and special chargeability, with its unique and efficient divalent ions (Ca 2+ , Mg 2+ , SO4 2- etc.) interception characteristics, so that the nanofiltration technology as the core has received extensive attention in the fields of seawater softening, wastewater treatment, and feed liquid concentration. For the seawater desalination system, due to the effective removal of divalent ions by the nanofiltration technology, the fouling of the desalination device is reduced, the distillation temperature, heat tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/78B01D67/00
Inventor 徐佳高从堦蒋钰烨
Owner OCEAN UNIV OF CHINA
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