Graphene oxide film based on dopamine biomimetic modification as well as preparation method and application thereof

A graphene membrane, dopamine technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reducing hydrophilic and oleophobic capabilities, insufficient mechanical strength and stability of graphene membranes, etc. Not easy to fall off and break, good for preservation and reusability, suitable for large-scale production and application

Inactive Publication Date: 2017-06-13
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the patent uses dopamine to reduce the hydrophilic graphene oxide in the process of preparing the membrane, which reduces the hydrophilic and oleophobic capabilities of the membrane to a certain extent. In addition, the weak bond between the reduced graphene oxide and the substrate microporous membrane Adhesion forces lead to insufficient mechanical strength and stability properties of graphene films

Method used

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  • Graphene oxide film based on dopamine biomimetic modification as well as preparation method and application thereof
  • Graphene oxide film based on dopamine biomimetic modification as well as preparation method and application thereof
  • Graphene oxide film based on dopamine biomimetic modification as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) A commercial mixed cellulose ester membrane with a pore size of 0.22 μm was soaked in deionized water for about 1 h to remove surface impurities. Spread the washed membrane on a petri dish, and add 20 mL of 50 mmol / L Tris-HCl buffer solution (pH=8.5) and 20 mg of dopamine hydrochloride in sequence. Then, the culture dish was placed in a full-temperature shaking incubator, the reaction temperature was set at 25 °C, the rotation speed was set at 40 rpm, and the reaction time was 12 h. Finally soak in deionized water for later use to obtain a dopamine-modified mixed cellulose ester film.

[0037] (2) Fix the membrane prepared in step (1) on a vacuum filtration device, add 60 mL of 1 mg / L graphene oxide solution, and vacuum filter at 0.02 MPa to form a membrane. After natural drying at room temperature, a graphene oxide film modified based on dopamine was obtained.

[0038] (3) After mixing 0.6 g of Tween 20, 120 mL of water and 4 mL of petroleum ether, it was stirred...

Embodiment 2

[0043] (1) A commercial mixed cellulose ester membrane with a pore size of 0.22 μm was soaked in deionized water for about 1 h to remove surface impurities. Spread the washed membrane on a petri dish, and add 50 mL of 50 mmol / L Tris-HCl buffer solution (pH=8.5) and 50 mg of dopamine hydrochloride in sequence. Then, the culture dish was placed in a full-temperature shaking incubator, the reaction temperature was set at 25 °C, the rotation speed was set at 50 rpm, and the reaction time was 15 h. Finally soak in deionized water for later use to obtain a dopamine-modified mixed cellulose ester film.

[0044](2) Fix the membrane prepared in step (1) on a vacuum filtration device, add 50 mL of 1 mg / L graphene oxide solution, and vacuum filter at 0.05 MPa to form a membrane. After natural drying at room temperature, a graphene oxide film modified based on dopamine was obtained.

[0045] (3) After mixing 1.3 g of Tween 80, 120 mL of water and 4 mL of mineral oil, and ultrasonically ...

Embodiment 3

[0049] (1) A commercial mixed cellulose ester membrane with a pore size of 0.45 μm was soaked in deionized water for about 1 h to remove surface impurities. Spread the washed membrane on a petri dish, and add 60 mL of 50 mmol / L Tris-HCl buffer solution (pH=8.5) and 60 mg of dopamine hydrochloride in sequence. Then the culture dish was placed in a full-temperature shaking incubator, the reaction temperature was set at 25°C, the rotation speed was set at 60 rpm, and the reaction time was 20 h. Finally soak in deionized water for later use to obtain a dopamine-modified mixed cellulose ester film.

[0050] (2) Fix the membrane prepared in step (1) on a vacuum filtration device, add 40 mL of 1 mg / L graphene oxide solution, and vacuum filter at 0.07 MPa to form a membrane. After natural drying at room temperature, a graphene oxide film modified based on dopamine was obtained.

[0051] (3) After mixing 0.3 g of cetyltrimethylammonium bromide, 120 mL of water and 4 mL of n-hexane, a...

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Abstract

The invention relates to a graphene oxide film based on dopamine biomimetic modification as well as a preparation method and application thereof, and belongs to the field of film material preparation. The preparation method comprises the following steps of: firstly preparing a mixed cellulose ester film modified by dopamine by using a mussel biomimetic method; and then carrying out vacuum drawing and filtering of a graphene oxide solution on the surface of the film, and drying to obtain the film. The film is capable of filtering stable oil-water emulsion of a surface active agent and has the advantages of high separation efficiency, good stability and reusability. The preparation method has the beneficial effects that the film is prepared by vacuum drawing and filtering, the preparation method is simple, needed raw materials are mild without toxicity and are easily available, and the film is suitable for large-scale production and application.

Description

technical field [0001] The invention belongs to the field of membrane material preparation, and provides a dopamine-based biomimetic modified graphene oxide membrane and a preparation method and application thereof. Background technique [0002] With the development of social economy, oily wastewater from industrial production has become a serious environmental problem. Oily wastewater pollution may cause devastating damage to the ecosystem and also cause potential harm to human health. Oil substances usually exist in three states in wastewater: (1) floating oil, with a particle size greater than 100 μm. In petroleum sewage, this oil content is as high as 60-80%; (2) dispersed oil, oil droplets The diameter is between 10-100 μm, suspended in water; (3) emulsified oil, the oil droplet size is less than 10 μm, and it is in an emulsified state. For the third kind of oil-water mixed emulsion, especially the oil-water emulsion stabilized by surfactant, because of its small size...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/02B01D69/02
CPCB01D67/0079B01D69/02B01D71/021
Inventor 刘燕秦长春刘占超仇健彭建波
Owner JIANGSU UNIV
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