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Preparation method of graphene macromoleclar polymer composite nanofiltration membrane

A technology of composite nanofiltration membrane and graphene polymer, which is applied in the field of preparation of graphene polymer composite nanofiltration membrane, can solve the problems of low membrane performance and use efficiency, low flux, and low salt interception rate, and achieve Increased rejection rate, improved membrane performance, and improved purification effects

Inactive Publication Date: 2018-09-14
JIMEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the problems of low flux, low salt interception rate, low membrane performance and use efficiency of the existing graphene oxide composite nanofiltration membrane prepared by the composite method

Method used

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  • Preparation method of graphene macromoleclar polymer composite nanofiltration membrane

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Effect test

Embodiment 1

[0024] The invention provides a graphene polymer composite nanofiltration membrane, the preparation method of which is as follows:

[0025] Step 1: configure mixed acid, concentrated sulfuric acid (98%): concentrated phosphoric acid (85%) = 9: 1, put it in a container; take an appropriate amount of potassium permanganate;

[0026] Step 2: Take an appropriate amount of graphite, slowly pour the mixed acid along the wall of the cup into the container containing graphite;

[0027] Step 3: Place the above-mentioned mixed reactants in a magnetic stirring oil bath that has been preheated to 50°C, and slowly add potassium permanganate;

[0028] Step 4: After adding potassium permanganate, close the mouth of the container to prevent impurities from falling into the container. Then the reaction system was heated at 50° C. for 6 hours;

[0029] Step 5: Then, continue to add diluted hydrogen peroxide to the mixture while heating and stirring at 50°C. The standard of how much hydrogen p...

Embodiment 2

[0040] The invention provides a graphene polymer composite nanofiltration membrane, the preparation method of which is as follows:

[0041] Step 1: configure mixed acid, concentrated sulfuric acid (98%): concentrated phosphoric acid (85%) = 9: 1, put it in a container; take an appropriate amount of potassium permanganate;

[0042] Step 2: Take an appropriate amount of graphite, slowly pour the mixed acid along the wall of the cup into the container containing graphite;

[0043] Step 3: Place the above-mentioned mixed reactants in a magnetic stirring oil bath that has been preheated to 50°C, and slowly add potassium permanganate;

[0044] Step 4: After adding potassium permanganate, close the mouth of the container to prevent impurities from falling into the container. Then the reaction system was heated at 50° C. for 6 hours;

[0045] Step 5: Then, continue to add diluted hydrogen peroxide to the mixture while heating and stirring at 50°C. The standard of how much hydrogen p...

Embodiment 3

[0056] The invention provides a graphene polymer composite nanofiltration membrane, the preparation method of which is as follows:

[0057] Step 1: configure mixed acid, concentrated sulfuric acid (98%): concentrated phosphoric acid (85%) = 9: 1, put it in a container; take an appropriate amount of potassium permanganate;

[0058] Step 2: Take an appropriate amount of graphite, slowly pour the mixed acid along the wall of the cup into the container containing graphite;

[0059] Step 3: Place the above-mentioned mixed reactants in a magnetic stirring oil bath that has been preheated to 50°C, and slowly add potassium permanganate;

[0060] Step 4: After adding potassium permanganate, close the mouth of the container to prevent impurities from falling into the container. Then the reaction system was heated at 50° C. for 6 hours;

[0061] Step 5: Then, continue to add diluted hydrogen peroxide to the mixture while heating and stirring at 50°C. The standard of how much hydrogen p...

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Abstract

The invention discloses a preparation method of a graphene macromoleclar polymer composite nanofiltration membrane. The method includes: taking an ultrafiltration membrane as the base membrane, coating the base membrane with a layer of 0.3-0.5mm thick cationic polyacrylamide and graphene solution mixed liquid by solution coating method, and putting the product in a 60-80DEG C oven for crosslinkingfor 0.5-3h, thus obtaining the graphene macromoleclar polymer composite nanofiltration membrane. The graphene macromoleclar polymer composite nanofiltration membrane has excellent adsorbability, low temperature far infrared, bacteriostasis, ultraviolet resistance and other functions, the macromoleclar polymer cationic polyacrylamide has filtration promoting, clarification and settling promoting effects, and can promote the purification and filtration ability of the nanofiltration membrane, by adding the cationic polyacrylamide, a quaternary ammonium salt cationic group is introduced to the nanofiltration membrane surface, thus increasing the hydrophilicity and selectivity of the membrane, by adding graphene and the macromoleclar polymer, the prepared graphene macromoleclar polymer composite nanofiltration membrane ha significantly improved performance, good selective separation ability, and significantly improved Na2SO4 rejection rate and NaCl rejection rate.

Description

technical field [0001] The invention relates to a composite nanofiltration membrane, in particular to a preparation method of a graphene polymer composite nanofiltration membrane. Background technique [0002] Nanofiltration is a new type of membrane separation technology, which is between reverse osmosis and ultrafiltration. The pore size is in the nanometer range, generally 0.5-2.0nm. At present, the preparation methods of nanofiltration membranes mainly include composite method, phase inversion method, charging method and blending method, among which composite method includes surface coating method and interfacial polymerization method. Composite method is currently the most used and most effective method for preparing nanofiltration membranes, and it is also the method for producing commercial nanofiltration membranes with the most varieties and the largest yield. The method is to compound an ultra-thin functional layer with a nanometer aperture on the surface of an ult...

Claims

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Application Information

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IPC IPC(8): B01D71/82B01D69/02B01D69/12B01D71/02B01D71/40B01D67/00
CPCB01D69/02B01D69/125B01D71/021B01D71/40B01D71/82B01D2325/12B01D2325/30B01D2325/36B01D2325/48
Inventor 林荣川
Owner JIMEI UNIV
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