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Preparation method of graphene composite foam for oil-water separation

A graphene composite and oil-water separation technology, which is applied in separation methods, liquid separation, chemical instruments and methods, etc., can solve problems such as performance degradation, structural damage, and secondary pollution of water bodies, and achieve improved flexibility, low cost, and improved Effect of cycle life

Active Publication Date: 2017-05-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the fact that the surface of graphene is hydrophobic and has a single functional group, it is easy to agglomerate in solution, which reduces its performance and makes it difficult to functionalize it; the prepared graphene foam is brittle, which makes it easy to collapse during application and cause structural damage. It also brings secondary pollution to the water body; the selective separation efficiency of graphene foam is low, that is, while absorbing oil, it also partially absorbs water

Method used

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  • Preparation method of graphene composite foam for oil-water separation
  • Preparation method of graphene composite foam for oil-water separation
  • Preparation method of graphene composite foam for oil-water separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Graphene oxide was prepared by the oxidation exfoliation method, and a graphene oxide solution with a concentration of 2 mg / mL was prepared and ultrasonically treated for 2 h, then the same mass of dopamine was added and its pH was adjusted to 8.5 with ammonia water, and then placed in a reaction kettle at 180 °C Reaction at high temperature for 12h;

[0039] After cooling to room temperature, the hydrogel was taken out and immersed in a chitosan acetic acid solution with a concentration of 8mg / mL for 12h, and then freeze-dried at -55°C and a vacuum of 10Pa for 15h to prepare chitosan / graphene syntactic foam;

[0040] Then immerse it in 10mM 1H, 1H, 2H, 1H-perfluorodecyl mercaptan methanol solution for 24h, and finally put it in a hot blast drying oven and dry it at 50°C for 16h to obtain fluorinated graphene composite foam .

[0041] The prepared chitosan / graphene composite foam has good flexibility, and it can be compressed to the limit by external force, and the fo...

Embodiment 2

[0052] Graphene oxide was prepared by the oxidation exfoliation method, and the graphene oxide solution with a concentration of 2.5mg / mL was ultrasonically treated for 2h, then dopamine, which was half of the mass of graphene oxide, was added and the pH was adjusted to 8.5 with ammonia water, and then put into the reaction Reaction in the kettle at a high temperature of 160°C for 12 hours;

[0053] After cooling to room temperature, take it out and immerse it in a chitosan acetic acid solution with a concentration of 10mg / mL to react for 8h, then freeze-dry it at -40°C and a vacuum of 10Pa for 18h to prepare a chitosan / graphene composite foam;

[0054] Then immerse it in 10mM 1H, 1H, 2H, 1H-perfluorodecyl mercaptan methanol solution for 24h, and finally put it in a hot blast drying oven and dry it at 60°C for 12h to obtain fluorinated graphene composite foam .

[0055] Chitosan / graphene composite foam has good flexibility and self-cleaning effect. Both graphene composite foam...

Embodiment 3

[0057] Graphene oxide was prepared by the oxidation exfoliation method, and the graphene oxide solution with a concentration of 3mg / mL was ultrasonically treated for 2h, then dopamine twice the mass of graphene oxide was added and the pH was adjusted to 8.5 with ammonia water, and then put into the reactor React at a high temperature of 120°C for 15 hours;

[0058] After cooling to room temperature, take out and immerse in a chitosan acetic acid solution with a concentration of 12 mg / mL to react for 6 hours, then freeze-dry at -45°C and a vacuum of 10 Pa for 16 hours to prepare a chitosan / graphene composite foam;

[0059] Then it was immersed in 10mM 1H, 1H, 2H, 1H-perfluorodecyl mercaptan ethanol solution for 24h, and finally placed in a hot blast drying oven at 55°C for 15h to obtain a fluorinated graphene composite. Foam.

[0060] Both chitosan / graphene composite foams have good flexibility and self-cleaning effect. Both graphene composite foams can achieve efficient and s...

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Abstract

The invention relates to the field of polymer materials, in particular to a preparation method of graphene composite foam for oil-water separation. The preparation method comprises the steps that reduction and crosslinking are conducted on oxidized graphene by dopamine, a hydrothermal method is used to make the oxidized graphene form a three-dimensional structure in self-assembly mode, chitosan / graphene composite foam is prepared by soaking and freeze-drying with a chitosan solution, and finally the chitosan / graphene composite foam is fluoridized to prepare the fluoridized graphene composite foam. The obtained chitosan / graphene composite foam has super amphipathicity in the air and underwater super lipophobicity, after the fluoridation, the chitosan / graphene composite foam has super hydrophobicity, and chitosan and raphene have the advantages of good flexibility, high selective separation efficiency and long cycle service life; the foam can exist stably in a corrosive medium; water takes use of gravity to go through the chitosan / graphene composite foam and does not need to be driven by external force; non-toxic biological materials such as the dopamine and the chitosan are used, the foam is green and environmentally friendly, an anti-bacteria effect of the chitosan serves as a function of purifying a water body during the oil-water separation.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a method for preparing graphene composite foam used for oil-water separation. Background technique [0002] Large and small oil spill accidents happen every year around the world, especially the large oil spill accident in the Gulf of Mexico in 2010, which resulted in the leakage of 1 million tons of crude oil. Incalculable losses to the economy. Adsorbent materials are the best choice for treating oil spills and industrial wastewater due to their low operating costs and good adsorption capacity. Commonly used adsorption materials include activated carbon, zeolite, organic clay, wood fiber, activated carbon fiber and other adsorption materials. However, these adsorbents have disadvantages such as low selective separation efficiency, that is, absorbing oil and water at the same time; being difficult to recycle and prone to secondary pollution, which limits their practical applic...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30B01D15/08C02F1/40C08J9/28C08J9/40C08K3/04C08L5/08C08L79/02
CPCB01D15/08B01J20/20B01J20/24B01J20/28045C02F1/40C08J9/28C08J9/40C08J2305/08C08J2479/02C08K3/04
Inventor 李学达吕倩曹宁林学强孙建波
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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