Preparation method of amino-modified graphene oxide composite positive permeable film

A technology of graphene compounding and amino modification, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of high salt permeation flux, poor mechanical strength, and low pure water permeation flux, etc. Achieve the effects of good chemical stability, high mechanical strength, and slow membrane fouling

Inactive Publication Date: 2014-06-18
DONGHUA UNIV
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Problems solved by technology

However, the current forward osmosis membrane is still in the research and development stage, and the commercially produced forwar

Method used

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Experimental program
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Example Embodiment

[0018] Example 1

[0019] A method for preparing an amino-modified graphene oxide composite forward osmosis membrane, the specific steps are:

[0020] (1) Add 200g of graphene oxide to 200mL of dimethylformamide, and ultrasonically treat it for 2h at an ultrasonic frequency of 40KHz to obtain a graphene oxide suspension; add 30g of triethylenetetramine to the graphene oxide suspension , 5g dicyclohexylcarboimide, sonicated for 10min under the condition of ultrasonic frequency of 40KHz, reacted at 120℃ for 48h, add 80mL of absolute ethanol, let stand overnight; remove the supernatant of the supernatant, filter with polytetraethylene membrane The lower layer is precipitated and washed with ethanol and deionized water in sequence, and the resulting sample is dried at 80° C. to obtain amino graphene oxide nanoparticles with a particle size of 50-100 nm.

[0021] (2) Add 0.6g of amino graphene oxide nanoparticles to a mixture of 6.2g of dimethylformamide and 2.1g of methylpyrrolidone, an...

Example Embodiment

[0024] Example 2

[0025] (1) Add 300g of graphene oxide to 300mL of dimethylformamide, and ultrasonically treat it for 3h at an ultrasonic frequency of 40KHz to obtain a graphene oxide suspension; add 40g of ethylenediamine to the graphene oxide suspension, 10g dicyclohexylcarboimide, sonicated for 5min under the condition of ultrasonic frequency of 40KHz, reacted at 120℃ for 50h, add 100mL absolute ethanol, and let stand overnight; remove the supernatant of the upper layer, filter the lower layer with a polytetraethylene membrane Precipitate and sequentially wash with ethanol and deionized water, and the obtained sample is dried at 70° C. to obtain amino graphene oxide nanoparticles with a size of 500 nm-5um and a thickness of 0.8-1.2 nm.

[0026] (2) Add 1g of amino-graphene oxide nanoparticles to a mixture of 12g of dimethylformamide and 4g of methylpyrrolidone, and then sonicate for 40min under the condition of an ultrasonic frequency of 40KHz to make the amino-graphene oxide ...

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Abstract

The invention provides a preparation method of an amino-modified graphene oxide composite positive permeable film. The method is characterized by comprising the following specific steps: mixing graphene oxide, dimethyl formamide, organic amine and dicyclohexyl carbimide, and performing ultrasonic treatment; reacting for 40-50 hours at the temperature of 100-150 DEG C; adding absolute ethyl alcohol, and standing and filtering to obtain a precipitate; washing and drying the precipitate to obtain amino-modified graphene oxide; mixing the amino-modified graphene oxide with a solvent, performing ultrasonic treatment, and adding an additive and a film formation polymer into a mixed solution to prepare a casting film solution; de-foaming to prepare a base film through a phase inversion method, and immersing the base film in pure water for later use; and pouring a metaphenylene diamine solution and trimesoyl chloride to the surface of the base film, performing a contact reaction, washing the surface of the film with an organic solvent, and drying the film to obtain the amino-modified graphene oxide composite positive permeable film. The amino-modified graphene oxide composite positive permeable film is high in mechanical strength, high in chemical stability, large in permeation flux of the pure water, and high in salt rejection rate.

Description

technical field [0001] The invention relates to a preparation method of an amino-modified graphene oxide composite forward osmosis membrane. Background technique [0002] Due to the depletion of fresh water resources, seawater desalination technology is getting more and more attention. Among them, the energy consumption of reverse osmosis technology in seawater desalination has been reduced from eighty-nine kilowatt-hours of electricity to produce one ton of water at the beginning to four kilowatt-hours of electricity to produce one ton of water. There is not much room for development. In order to further reduce the cost of energy consumption, we can only hope for new technologies in the future. Compared with reverse osmosis technology, forward osmosis technology has unique advantages in this respect, and will not cause environmental pollution. It will replace reverse osmosis and become a superior seawater desalination technology. [0003] Forward osmosis technology provid...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D71/56B01D71/06B01D67/00
Inventor 李方赵永军李佳峰孟蝶汪帅李勇潘婷杨波田晴
Owner DONGHUA UNIV
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