Preparation method for graphene-based film and application of graphene-based film to oil-water separation

A graphene membrane and graphene hydrogel technology, applied in semi-permeable membrane separation, separation method, liquid separation and other directions, can solve the problems of lack of comprehensive investigation of oil-water separation performance, complex process flow, and many additives, etc. The effect of light and stable membrane quality, low energy consumption and low cost

Active Publication Date: 2014-05-07
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0005] The technical process of the above-mentioned prior art preparation method is relatively complicated, the cost is high, and many additives are added, and the above-mentioned preparation method cannot carry out continuous oil-water separation operation, and its oil-water separation performance has not been comprehensively investigated.

Method used

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  • Preparation method for graphene-based film and application of graphene-based film to oil-water separation
  • Preparation method for graphene-based film and application of graphene-based film to oil-water separation
  • Preparation method for graphene-based film and application of graphene-based film to oil-water separation

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Embodiment 1

[0028] 100 microliters of ethanedithiol was added to 10 mL of graphene oxide aqueous solution (80 mg / mL), fully stirred and reacted at 70 °C for 4 h to obtain graphene oxide hydrogel. After the hydrogel was dried, graphene oxide xerogel was obtained. ; Under the pressure of 50 kPa, the graphene oxide xerogel was compacted and maintained for 5min, and then the xerogel was immersed in 85% hydrazine hydrate and reacted at 100 °C for 30min to obtain a graphene-based membrane material; finally, the obtained The graphene membrane can be directly used for oil-water separation after Soxhlet extraction in aqueous solution for 5 hours and drying at 60°C.

Embodiment 2

[0030] Add 100 microliters of ethylenediamine to 10 mL of graphene oxide aqueous solution (50 mg / mL), stir well and react at 100 °C for 4 h to obtain graphene oxide hydrogel, and dry the hydrogel to obtain graphene oxide xerogel; Under the pressure of 80 kPa, the graphene oxide xerogel was compacted and maintained for 10 min, and then the xerogel was immersed in 55% hydroiodic acid and reacted at 90 °C for 30 min to obtain a graphene-based membrane; finally, the obtained The graphene membrane can be directly used for oil-water separation after Soxhlet extraction in aqueous solution for 5 hours and drying at 60°C.

Embodiment 3

[0032] 200 microliters of diethylenetriamine was added to 10 mL of graphene oxide aqueous solution (20 mg / mL), fully stirred and reacted at 120 °C for 6 h to obtain graphene oxide hydrogel. After the hydrogel was dried, graphene oxide xerogel was obtained. ; Under the pressure of 80 kPa, the graphene oxide xerogel was compacted and maintained for 5min, and then the xerogel was immersed in 85% hydrazine hydrate solution and reacted at 90°C for 10min to obtain the graphene-based membrane material; finally, the obtained The graphene membrane can be directly used for oil-water separation after Soxhlet extraction in aqueous solution for 5h and drying at 60°C.

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Abstract

The invention relates to a preparation method for a graphene-based film and application of the graphene-based film to oil-water separation. The graphene-based film is obtained by preparing gel from oxidized graphene and a crosslinking agent, drying the gel, compacting the gel under the pressure of 10-200 kPa, and reducing. The preparation method for the graphene-based oil-water separation film is simple, feasible and low in cost and can be applied to batch industrial production; the film is light in mass and stable and can be cyclically used at high efficiency; the graphene-based oil-water separation film material can separate oil from an oil-water mixture at high efficiency, low energy consumption and ultrahigh speed in various environments, the water content is lower than 200ppm, the minimum water concentration is up to 10ppm, and the water concentration is different slightly according to different oil phases.

Description

technical field [0001] The invention relates to a preparation method of a graphene base membrane and its application in oil-water separation, and belongs to the technical fields of functional material technology, membrane separation technology and environmental protection technology. Background technique [0002] Crude oil extraction, marine oil spills, industrial and domestic oily sewage, etc. have brought great harm to the environment and ecological balance, so that oil-water separation technology has attracted much attention. At present, membrane separation technology is an effective method for the treatment of oily sewage, mainly organic microfiltration membranes and organic ultrafiltration membranes. However, due to its poor chemical stability and thermal stability, and even swelling and dissolution, the use of such membranes is greatly limited. [0003] The patent application with the application number of 201310407309 discloses a preparation method of a magnetic grap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D17/022
Inventor 王兴袁其朋李国锋洪杰全柯丞
Owner BEIJING UNIV OF CHEM TECH
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