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Oxidized hyperbranched polyethyleneimine nanofiltration membrane, preparation method and application

A polyethyleneimine sodium and polyethyleneimine technology, which is applied in the field of preparation and oxidation of hyperbranched polyethyleneimine nanofiltration membranes, can solve the problems of difficult industrial production and cannot meet the requirements of green chemistry, etc., and achieves huge application potential and conditions. Mild effect with simple preparation method

Active Publication Date: 2021-10-01
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of organic solvents in the preparation process of the interfacial polymerization method, in the face of increasingly stringent environmental protection regulations and production costs, it cannot meet the needs of green chemistry and is not easy for industrial production.

Method used

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  • Oxidized hyperbranched polyethyleneimine nanofiltration membrane, preparation method and application
  • Oxidized hyperbranched polyethyleneimine nanofiltration membrane, preparation method and application
  • Oxidized hyperbranched polyethyleneimine nanofiltration membrane, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take 25 mg of hyperbranched polyethyleneimine with a molecular weight of 1800 Da, dissolve it in 5 mL of deionized water, and stir evenly to obtain an aqueous solution of hyperbranched polyethyleneimine, then add 0.5 mL of 30 wt % hydrogen peroxide to it, and react at 25 ° C for 3 h. After precipitation was precipitated in the above reaction system, 30 mL of deionized water was added to dilute to obtain a suspension of oxidized hyperbranched polyethyleneimine. Among them, the oxidized hyperbranched polyethyleneimine precipitated in the reaction system was light yellow, and the microscopic appearance was as follows: figure 1 As shown in A.

[0038]A mixed cellulose microfiltration membrane with a pore size of 0.1 μm is used as a support layer, and the suspension of oxidized hyperbranched polyethyleneimine is placed on the support layer and vacuum-filtered to form a membrane at a vacuum degree of 0.05 MPa, and dried at 45°C for 2 hours to obtain Oxidized hyperbranched po...

Embodiment 2

[0046] Take 25 mg of hyperbranched polyethyleneimine with a molecular weight of 10000 Da, dissolve it in 5 mL of deionized water, and stir evenly to obtain an aqueous solution of hyperbranched polyethyleneimine, then add 2 mL of 30 wt % hydrogen peroxide to it, and react at 25 ° C for 3 h, and wait for the above After precipitation in the reaction system, add 30 mL of deionized water to dilute to obtain a suspension of oxidized hyperbranched polyethyleneimine.

[0047] Using a mixed cellulose microfiltration membrane with a pore size of 0.1 μm as a support layer, place the suspension of oxidized hyperbranched polyethyleneimine on the support layer and vacuum filter it to form a membrane. Hyperbranched polyethyleneimine nanofiltration membrane.

[0048] Under the pressure of 4bar, the brilliant blue (BB) solution of 50mg / L is separated by the oxidized hyperbranched polyethyleneimine film that obtains, and the result is as follows image 3 As shown, the flux is 1.1L m -2 h -1...

Embodiment 3

[0050] Take 25 mg of hyperbranched polyethyleneimine with a molecular weight of 600 Da, dissolve it in 5 mL of deionized water, and stir evenly to obtain an aqueous solution of hyperbranched polyethyleneimine, then add 1 mL of chemically pure sodium hypochlorite to it, and react for 2 minutes at 25 ° C, wait for the above reaction After precipitation in the system, add 30 mL of deionized water to dilute to obtain a suspension of oxidized hyperbranched polyethyleneimine.

[0051] Using a mixed cellulose microfiltration membrane with a pore size of 0.1 μm as a support layer, place the suspension of oxidized hyperbranched polyethyleneimine on the support layer and vacuum filter it to form a membrane. Hyperbranched polyethyleneimine nanofiltration membrane.

[0052] Under the pressure of 4bar, the rhodamine B (RhB) solution of 50mg / L is separated by the oxidized hyperbranched polyethyleneimine membrane that obtains, and the result is as follows image 3 As shown, the flux is 1.2L...

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Abstract

The invention discloses an oxidized hyperbranched polyethyleneimine nanofiltration membrane. The membrane comprises a supporting layer and an oxidized hyperbranched polyethyleneimine layer, and the oxidized hyperbranched polyethyleneimine layer is obtained by performing vacuum filtration on oxidized hyperbranched polyethyleneimine turbid liquid to the supporting layer. The invention also discloses a preparation method of the oxidized hyperbranched polyethyleneimine nanofiltration membrane, and the method comprises the following steps: adding an oxidizing agent into a hyperbranched polyethyleneimine aqueous solution for reaction, and after precipitation, adding deionized water for dilution to obtain oxidized hyperbranched polyethyleneimine turbid liquid; placing the oxidized hyperbranched polyethyleneimine suspension on a support layer, carrying out vacuum filtration to form a membrane, and carrying out drying to obtain the oxidized hyperbranched polyethyleneimine nanofiltration membrane. The preparation method is simple, conditions are mild, and auxiliary effects of organic solvents are not needed. The oxidized hyperbranched polyethyleneimine nanofiltration membrane can intercept dye pollutants in water and remove salt in water, and has huge application potential in the field of water treatment.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an oxidized hyperbranched polyethyleneimine nanofiltration membrane, a preparation method and an application. Background technique [0002] As a highly efficient, energy-saving and environmentally friendly water treatment technology, membrane separation technology has been widely used in the field of sewage treatment. Nanofiltration membrane is a functional semipermeable membrane between ultrafiltration membrane and reverse osmosis membrane. Due to its nanoscale membrane pore size and charge effect, it allows low-priced molecular salts to pass through and intercepts higher molecular weight organic matter and Multivalent ions, so it has unique separation performance and higher separation precision. Compared with other separation membranes, nanofiltration membranes have the advantages of large membrane flux, low osmotic pressure, selective separation, low ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D71/60B01D67/00C02F1/44C02F5/00C02F101/30
CPCB01D67/0006B01D71/60B01D69/10C02F1/442C02F5/00C02F2101/308Y02A20/131
Inventor 陈涛夏骏远谷金翠肖鹏
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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