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Positively charged composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and positively charged technology, applied in the field of membrane separation, can solve problems such as poor solubility and difficult separation of membranes, achieve high rejection rate, high oxidation resistance, and broaden the use range

Inactive Publication Date: 2017-08-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its poor solubility, it is generally difficult to directly prepare separation membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of separation membrane:

[0023] Using polyethersulfone as the support layer membrane material and N,N‐dimethylacetamide (DMAc) as the solvent, the polyethersulfone ultrafiltration membrane was prepared by phase inversion method. Using it as the base membrane, the functional layer of composite nanofiltration membrane is prepared on it by dip coating method. The details are as follows: using 1 wt% epoxypropyltrimethylammonium chloride chitosan as a solute, deionized water as a solvent, and adopting a dip coating method to form a film. The formed primary film was dried in an oven at a temperature of 60° C. for 5 minutes. Then immerse in 1% glutaraldehyde solution for 10 seconds, take it out and dry it at 60°C for 5 minutes.

[0024] (2) Application:

[0025] The treatment solution is 1g / L magnesium chloride solution. When the external pressure is 0.3MPa, the rejection rate of the separation membrane to the inorganic salt magnesium chloride is 92%, and t...

Embodiment 2

[0027] (1) Preparation of separation membrane:

[0028] Using polyetherimide as the support layer membrane material and N-methylpyrrolidone as the solvent, a polyethersulfone ultrafiltration membrane is prepared by a phase inversion method. Using it as the base membrane, the functional layer of composite nanofiltration membrane is prepared on it by dip coating method. The details are as follows: 1wt% glycidyltrimethylammonium chloride chitosan is used as solute, 0.5% nanometer lanthanum strontium cobalt iron is used as additive, deionized water is used as dispersant, and the film is prepared by dip coating. The formed primary film was dried in an oven at a temperature of 60° C. for 5 minutes. Then immerse in 1% epichlorohydrin ethanol solution for 10 seconds, take it out and dry it at 60°C for 5 minutes.

[0029] (2) Application

[0030] The treatment solution is 1g / L magnesium chloride solution. When the external pressure is 0.3MPa, the rejection rate of the separation mem...

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Abstract

The invention belongs to the technical field of membrane separation, and provides a positively charged composite nanofiltration membrane and a preparation method thereof. The composite nanofiltration membrane has the positively charged performance, and comprises a separation functional layer and a support layer, wherein the support layer is positioned under the separation functional layer; the separation functional layer is an ultra-thin compact membrane formed by a soaking and coating method; the thickness is within 200nm; the ultra-thin compact membrane is prepared from epoxypropyltrimethyl ammonium chloride chitosan, additives, cross linking agents and solvents. The positively charged composite nanofiltration membrane is a flat plate membrane or a hollow fiber membrane. The commercial epoxypropyltrimethyl ammonium chloride chitosan is used in the functional layer in the preparation process, so that the prepared composite membrane has the positively charged characteristics, so that the high interception rate can be realized on the hypervalent inorganic salts. Meanwhile, the membrane also has high anti-oxidization performance; the use range is expanded. The membrane can also be applied to the treatment of waste water containing heavy metal ions and the treatment of other wastewater containing high oxidability.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an organic polymer-based separation membrane suitable for desalination of seawater, desalination of brackish water and removal of heavy metal ions. Background technique [0002] Nanofiltration membrane technology is a new energy-saving and environmentally friendly separation technology. Among them, positively charged nanofiltration membranes have been widely studied because they are more suitable for heavy metal ion removal, separation of high-priced inorganic salts, and good anti-pollution and antibacterial properties. Chitosan is a natural polymer with abundant sources, low cost and good hydrophilicity. However, due to its poor solubility, it is generally difficult to directly prepare separation membranes. Hydroxypropyltrimethylammonium chloride chitosan is obtained through chemical modification of chitosan. It has good antibacterial properties, film-fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/08B01D69/12B01D69/10B01D67/00
CPCB01D71/08B01D67/0002B01D69/10B01D69/125B01D2323/02B01D2323/26
Inventor 韩润林滕达马旭锋代岩
Owner DALIAN UNIV OF TECH
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