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Carboxylic oxidized graphene and method for modifying organic release film by means of same

A technology of graphene and carboxylation, which is applied in chemical instruments and methods, semi-permeable membrane separation, membranes, etc., can solve the problems of inability to effectively utilize the excellent performance of oxygen-containing functional groups on graphene oxide, and achieve good permeability and high affinity water effect

Active Publication Date: 2016-09-07
高学理
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the use of graphene oxide to modify pressure-driven membranes has attracted widespread attention. Improving the performance of separation membranes by blending has become the main method, but the limitation of the blending method is that only the nanometer size of graphene oxide is used. effect, the modification method is similar to the effect obtained by modifying other nanomaterials, and cannot effectively utilize the excellent properties of oxygen-containing functional groups on graphene oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Preparation of carboxylated graphene oxide:

[0020] Mix 50mg of graphite oxide with 100ml of ultrapure water, sonicate for 2 hours and then centrifuge, the supernatant is a graphene oxide solution, put the graphene oxide solution in a single-necked flask, and use 1mol / L sodium hydroxide solution to adjust the pH value to 12. Add 100 mg / L glycine, keep the temperature at 25°C and stir for 12 hours. After natural cooling, the product is dialyzed with a dialysis bag with a molecular weight cut-off of 8000-14000, and the water is changed once every 2 hours until the pH of the product solution remains unchanged.

[0021] 2. Preparation of nanofiltration membrane by carboxylated graphene oxide modification (chemical blending modification):

[0022] Use carboxylated graphene oxide to chemically blend and modify chitosan nanofiltration membrane: prepare 100ml of chitosan solution with a mass fraction of 2%, stir in an ice-water bath and add the carboxylated graphene oxide s...

Embodiment 2

[0024] 1. Preparation of carboxylated graphene oxide:

[0025] Mix 100mg of graphite oxide with 100ml of ultrapure water, sonicate for 4 hours and then centrifuge, the supernatant is a graphene oxide solution, put the graphene oxide solution in a single-necked flask, and use 1mol / L sodium hydroxide solution to adjust the pH value to 10. Add 50g / L glutamic acid, keep the temperature at 60°C and stir for 12 hours. After natural cooling, the product is dialyzed with a dialysis bag with a molecular weight cut-off of 8000-14000. Change the water every 2 hours until the pH of the product solution remains unchanged.

[0026] 2. Carboxylated graphene oxide modified separation membrane material to prepare reverse osmosis membrane (interface polymerization modification):

[0027] Under the condition of an ambient humidity of 80%, the aqueous phase solution with a mass fraction of 0.5% m-phenylenediamine and the above-mentioned carboxylated graphene oxide were stirred and mixed at 60°C f...

Embodiment 3

[0029] 1. Preparation of carboxylated graphene oxide:

[0030] Mix 50mg of graphite oxide with 100ml of ultrapure water, sonicate for 2 hours and then centrifuge, the supernatant is a graphene oxide solution, put the graphene oxide solution in a single-necked flask, and use 1mol / L sodium hydroxide solution to adjust the pH value to 12. Add 15g / L serine, keep the temperature at 25°C and stir for 36 hours. After natural cooling, the product is dialyzed with a dialysis bag with a molecular weight cut-off of 8000-14000, and the water is changed once every 2 hours until the pH of the product solution remains unchanged.

[0031] 2. Carboxylated graphene oxide modified separation membrane material to prepare nanofiltration membrane (surface graft modification):

[0032] Use carboxylated graphene oxide to modify the surface of chitosan nanofiltration membrane by grafting: prepare 100ml of chitosan solution with a mass fraction of 2%, let it stand for degassing for 24 hours, and apply ...

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Abstract

The invention discloses a carboxylic oxidized graphene preparing method and a method for modifying a release film by means of carboxylic oxidized graphene. According to the carboxylic oxidized graphene preparing method, oxidized graphene solution is used as the raw material, amino acid serves as the carboxylation reagent, the ph value of a reaction system is adjusted to be alkaline, heating reaction is conducted for a while, then natural cooling and dialysis are conducted in sequence to remove foreign ions, and then carboxylic oxidized graphene solution is obtained. When the carboxylic oxidized graphene solution is used for modifying a functional layer of the organic release film, carboxylic oxidized graphene is used as a modifier, and the surface functional layer of the organic release film is modified through chemical blending modification, interfacial polymerization modification, surface graft modification or self-assembly modification. Oxidized graphene with higher carboxyl functional group content can be obtained, higher hydrophilia, solubility, electric charge property and chemical reactivity of oxidized graphene can be realized through higher carboxyl content, and then the release film has higher permeability, entrapment property and hydrophilia.

Description

technical field [0001] The invention belongs to the technical field of graphene material preparation and separation membrane material preparation technology, and specifically relates to a preparation method of carboxylated graphene oxide and its application technology in the preparation of organic separation membranes. Background technique [0002] Graphene is a carbon atom with sp 2 The hybrid orbitals form a hexagonal planar film with a honeycomb lattice, and the graphene composed of a single layer of carbon atoms is only 0.34nm thick. It is currently the thinnest and hardest nanomaterial in the world, and has the smallest resistivity in the world. Graphene oxide means that the graphene plane is connected with oxygen-containing functional groups, and the edge is connected with carboxyl groups. The thickness of a single layer of graphene oxide is about 0.8nm. In 2012, scientists from the Massachusetts Institute of Technology published a paper, arguing that porous graphene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00
CPCB01D67/0039B01D71/021B01D2325/36
Inventor 高学理
Owner 高学理
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