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Modified polyamide reverse osmosis membrane with chemically grafted GO (graphene oxide) on surface and preparation method of modified polyamide reverse osmosis membrane

A technology of reverse osmosis membrane and surface chemistry, which is applied in the field of composite reverse osmosis membrane modification, can solve the problems of polyamide reverse osmosis membrane performance attenuation, desalination rate decrease, membrane life shortening, etc., and achieve low production cost, relatively low production cost, Effect of improving chlorine resistance

Inactive Publication Date: 2018-06-19
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current polyamide reverse osmosis membrane has poor chlorine resistance. Under the action of free chlorine, the cross-linked aromatic polyamide on the polyamide reverse osmosis membrane follows a multi-step chlorination degradation process, resulting in poor performance of the polyamide reverse osmosis membrane. Attenuation, the desalination rate gradually decreases, resulting in a reduction in membrane life
However, there is no research on chemically grafting graphene oxide onto the surface of polyamide membranes to improve chlorine resistance.

Method used

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  • Modified polyamide reverse osmosis membrane with chemically grafted GO (graphene oxide) on surface and preparation method of modified polyamide reverse osmosis membrane
  • Modified polyamide reverse osmosis membrane with chemically grafted GO (graphene oxide) on surface and preparation method of modified polyamide reverse osmosis membrane
  • Modified polyamide reverse osmosis membrane with chemically grafted GO (graphene oxide) on surface and preparation method of modified polyamide reverse osmosis membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The preparation method of the modified polyamide reverse osmosis membrane of the present embodiment comprises the following steps:

[0040] (1) Select the original membrane model as Dow LCLE-4040, cut out an aromatic polyamide membrane with a size of 15×10cm, wash it with pure water and set it aside.

[0041] (2) Weigh 2.928g of 2-(N-morpholine)ethanesulfonic acid (MES) and dissolve it in water, adjust its pH to 5.9 with NaOH solution, and constant volume in a 500ml volumetric flask.

[0042] (3) Take out 200ml of MES solution, add 0.1g of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC), fully immerse the membrane in it, take out the membrane after 10min, and then Add 0.05g of N-hydroxysuccinimide (NHS) to the solution after taking out the membrane, immerse the membrane again, and take it out after reacting for 30min;

[0043] (4) Weigh 0.2ml of ethylenediamine (EDA) and add it to the solution after taking out the membrane in step (3), immerse the mem...

Embodiment 2

[0054] The preparation method of the modified polyamide reverse osmosis membrane of the present embodiment comprises the following steps:

[0055] (1) Select the original membrane model as Dow LCLE-4040, cut out an aromatic polyamide membrane with a size of 15×10cm and wash it with pure water for use.

[0056] (2) Weigh 2.928g of 2-(N-morpholine)ethanesulfonic acid (MES) and dissolve it in water, adjust its pH to 6 with NaOH solution, and constant volume in a 500ml volumetric flask.

[0057] (3) Take out 200ml of MES solution and put it into a beaker, add 0.1g of EDC, immerse the membrane completely in it, take out the membrane after 10min, then add 0.05g of NHS into the solution, immerse the membrane again, react for 30min and take out.

[0058] (4) Weigh 0.2ml of ethylenediamine (EDA) and add it to the solution after taking out the membrane, immerse the membrane, and react overnight in a dark environment.

[0059] (5) Take out the membrane from the previous step experiment,...

Embodiment 3

[0067] The preparation method of the modified polyamide reverse osmosis membrane of the present embodiment comprises the following steps:

[0068] (1) Select the original membrane model as Dow LCLE-4040, cut out an aromatic polyamide membrane with a size of 15×10cm and wash it with pure water for use.

[0069] (2) Weigh 2.928g of 2-(N-morpholine)ethanesulfonic acid (MES) and dissolve it in water, adjust its pH to 6 with NaOH solution, and constant volume in a 500ml volumetric flask.

[0070] (3) Take out 200ml of MES solution and put it into a beaker, add 0.1g of EDC, immerse the membrane completely in it, take out the membrane after 10min, then add 0.05g of NHS into the solution, immerse the membrane again, take it out after reacting for 30min;

[0071] (4) Weigh 0.2ml of ethylenediamine (EDA) and add it to the solution after taking out the membrane, immerse the membrane, and react overnight in a dark environment;

[0072] (5) Take out the membrane from the previous step exp...

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Abstract

The invention provides a modified polyamide reverse osmosis membrane with chemically grafted GO (graphene oxide) on the surface and a preparation method of the modified polyamide reverse osmosis membrane. The modified polyamide reverse osmosis membrane is prepared from 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide by catalyzing an amidation reaction of carboxyl and amino, and chemical grafting of layered nano-material GO on a polyamide reverse osmosis membrane; the surface of a polyamide membrane and GO are rich in carboxyl, and layer upon layer connection of membrane surface carboxyl and GO carboxyl is realized by catalysis of a grafting reaction on the basis of a multi-amino substance as an intermediate linker. GO has good oxidation resistance, andthe content of N-H bonds in chlorine reactive groups is increased by the amidation reaction, so that chlorine resistance of the polyamide reverse osmosis membrane can be greatly improved, and the service life is prolonged. The modified polyamide reverse osmosis membrane has the advantages that the flux and the interception rate are basically unchanged, and the modified membrane has good chlorine resistance and can stably run.

Description

technical field [0001] The invention belongs to the field of modification of composite reverse osmosis membranes, and in particular relates to a modified polyamide reverse osmosis membrane with surface chemically grafted graphene oxide and a preparation method thereof. Background technique [0002] Polyamide reverse osmosis membrane is the most widely used reverse osmosis membrane, widely used in seawater desalination and brackish water desalination. However, the current polyamide reverse osmosis membrane has poor chlorine resistance. Under the action of free chlorine, the cross-linked aromatic polyamide on the polyamide reverse osmosis membrane follows a multi-step chlorination degradation process, resulting in poor performance of the polyamide reverse osmosis membrane. Attenuation, the desalination rate gradually decreases, resulting in a reduction in the life of the membrane. Therefore, the modification of chlorine resistance of polyamide reverse osmosis membrane is one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D69/02B01D71/56
CPCB01D67/0079B01D69/02B01D69/125B01D71/56
Inventor 董立峰邵斐斐于立岩董红周徐纯威
Owner QINGDAO UNIV OF SCI & TECH
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