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Method for modifying ultrafiltration membrances through metal cation cross-linked graphene oxide nanosheets

A technology of graphene nanosheets and metal cations, applied in chemical instruments and methods, ultrafiltration, membrane technology, etc., can solve problems such as the complexity of the modification process of ultrafiltration membranes, improve water treatment efficiency, facilitate promotion, and improve The effect of stability

Inactive Publication Date: 2017-09-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the complicated problem of the modification process of the existing ultrafiltration membrane, and to provide a method for modifying the ultrafiltration membrane with metal cation cross-linked graphene oxide nanosheets

Method used

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  • Method for modifying ultrafiltration membrances through metal cation cross-linked graphene oxide nanosheets
  • Method for modifying ultrafiltration membrances through metal cation cross-linked graphene oxide nanosheets
  • Method for modifying ultrafiltration membrances through metal cation cross-linked graphene oxide nanosheets

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Experimental program
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Effect test

Embodiment 1

[0025] 1) Add 0.1 mg of 1-layer graphene oxide nanosheets to 100 ml of deionized water, then add 2.415 mg of aluminum chloride hexahydrate to another 100 ml of deionized water, and mix the two solutions evenly. After that, place the membrane in the ultrafiltration cup, pour the mixed solution into the ultrafiltration cup, and filter for 2-5 minutes at a constant pressure of 0.05MPa to successfully load graphene oxide nanosheets on polyvinylidene fluoride The surface of the ultrafiltration membrane, the loaded membrane such as figure 1 shown.

[0026] 2), 1 milliliter of 1g / L bovine serum albumin (BSA) stock solution was added to 100 milliliters of deionized water, and the BSA solution was pre-deposited with 0.1 mg of graphene oxide nanosheets in the above step 1). For ultrafiltration of vinyl fluoride ultrafiltration membrane, use an electronic balance to connect to a data display to collect data and explore the change of membrane flux. Such as figure 2 As shown, the decay...

Embodiment 2

[0028] 1) Add 1 mg of 60-layer graphene oxide nanosheets to 100 ml of ethanol, then add 27.05 mg of ferric chloride hexahydrate to another 100 ml of deionized water, and mix the two solutions evenly. After that, place the membrane in the ultrafiltration cup, pour the mixed solution into the ultrafiltration cup, and filter for 2-5 minutes at a constant pressure of 0.2MPa to successfully load graphene oxide nanosheets on polyvinylidene fluoride Ultrafiltration membrane surface.

[0029] 2), 1 milliliter of 3g / L sodium humate (HS) stock solution was added to 300 milliliters of deionized water, and the HS solution was pre-deposited with the polyylidene fluoride of 1 mg graphene oxide nanosheet in the above step 1). For ethylene ultrafiltration membrane ultrafiltration, use an electronic balance to connect to a data display to collect data and explore changes in membrane flux. Such as image 3 shown. The membrane flux stability is greatly improved, after such as Figure 1 After...

Embodiment 3

[0031] 1), 15 milligrams of 100 layers of graphene oxide nanosheets were added to 100 milliliters of deionized water, then 1666.1 mg of aluminum sulfate octadecahydrate and 974.8 mg of hydrated ferric sulfate were added to another 100 milliliters of deionized water, and the two The solutions are mixed evenly. After that, place the membrane in the ultrafiltration cup, pour the mixed solution into the ultrafiltration cup, and filter for 2-5 minutes at a constant pressure of 0.4MPa to successfully load graphene oxide nanosheets on polyvinylidene fluoride Ultrafiltration membrane surface.

[0032] 2), 1 ml of 1g / L sodium alginate (SA) stock solution was added to 100 ml of deionized water, and the SA solution was pre-deposited with 15 mg of graphene oxide nanosheet polyylidene fluoride in the above step 1). For ethylene ultrafiltration membrane ultrafiltration, use an electronic balance to connect to a data display to collect data and explore changes in membrane flux. Such as F...

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Abstract

The invention discloses a method for modifying ultrafiltration membrances through metal cation cross-linked graphene oxide nanosheets, relates to ultrafiltration membrane modifying methods and belongs to the field of environmental water treatment. The method comprises the following steps of dissolving the graphene oxide nanosheets into solvent, and then adding in cationic cross-linking agent; after the graphene oxide nanosheets, the solvent and the cationic cross-linking agent are uniformly mixed, layer by layer packing and loading the graphene oxide nanosheets in the solution onto the surface of the ultrafiltration membranes. According to the method for modifying the ultrafiltration membrances through the metal cation cross-linking graphene oxide nanosheets, the graphene oxide nanosheets pre-deposited on the surface of the ultrafiltration membranes can retain pollutants through size selecting effects to reduce membrane pollution, to prolong the service life of the membranes and improve the water treatment efficiency. The method for modifying the ultrafiltration membrances through the metal cation cross-linking graphene oxide nanosheets is simple in operation, applicable to large-scale application and easy to popularize.

Description

technical field [0001] The invention relates to a method for modifying ultrafiltration membranes by crosslinking graphene oxide nanosheets with metal cations, and belongs to the field of environmental protection water treatment. Background technique [0002] Membrane technology is a simple and efficient water treatment technology. It is widely used in the field of environmental protection water treatment and has gradually become one of the foundations of the world's sustainable development strategy. Membrane technology has been widely used in water treatment in various fields due to its wide applicability. However, membrane fouling is still the main obstacle hindering the popularization and application of membrane technology. The main method to reduce membrane fouling in the early stage is to carry out a pretreatment process on sewage to reduce membrane fouling. The most important and traditional pretreatment process is chemical coagulation. In addition, there are also pret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D61/14C02F1/44
Inventor 刘婷杨冰孙克宁周慧敏
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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