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Non-layered cross-linked graphene oxide film as well as preparation method and application thereof

A graphene film, non-layered technology, applied in the field of non-layered cross-linked graphene oxide film and its preparation, can solve the problems of layered graphene oxide film being unable to meet demand, increasing fluid resistance, long diffusion path and the like , to achieve high flux and anti-pollution performance, high water flux and retention rate, and low water penetration resistance.

Inactive Publication Date: 2015-07-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But because the diffusion path in layered graphene oxide is too long, which increases the fluid resistance, the flux is very small
Therefore, for some applications that require high throughput, such as oil-water separation, layered graphene oxide films cannot meet the demand.

Method used

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  • Non-layered cross-linked graphene oxide film as well as preparation method and application thereof
  • Non-layered cross-linked graphene oxide film as well as preparation method and application thereof
  • Non-layered cross-linked graphene oxide film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Ultrasound 16mg graphene oxide (GO) in 2ml deionized water for 1.5 hours to obtain a uniform aqueous dispersion of graphene oxide, add 4mol / L sodium hydroxide solution to pH = 12.8, add 0.25ml concentration of 16mg / ml Hyperbranched polyethyleneimine (PEI) aqueous solution, stirred vigorously to form a graphene oxide sol, then slowly and evenly added the graphene oxide sol to the non-woven fabric in the petri dish, put the petri dish in a sealed tank at 80°C After 8 hours of treatment, filter and wash with a large amount of water to remove residual sodium hydroxide and unreacted hyperbranched polyethyleneimine, that is, to prepare a non-layered cross-linked graphene oxide film.

[0032] figure 1 and figure 2 Respectively, the cross-sectional view and surface view of the non-layered cross-linked graphene oxide film prepared in this example, it can be seen from this figure that the cross-section of the non-layered cross-linked graphene oxide film presents a homogeneous s...

Embodiment 2

[0043] Ultrasonicate 16 mg graphene oxide in 2 ml deionized water for 1.5 hours to obtain a uniform aqueous dispersion of graphene oxide, add 4 mol / L sodium hydroxide solution to pH = 12.8, add 0.5 ml hyperbranched polycarbonate with a concentration of 16 mg / ml Aqueous amide solution, stirred vigorously to form graphene oxide sol, then slowly and evenly drop the graphene oxide sol onto the non-woven fabric in the petri dish, put the petri dish in a sealed tank at 80°C for 8 hours, then filter with plenty of water Cleaning, to remove residual sodium hydroxide and unreacted hyperbranched polyamide, promptly makes non-layered cross-linked graphene oxide film.

[0044] The prepared non-layered cross-linked graphene oxide membrane was placed on a suction filtration device for oil-water separation test. Experimental process is identical with embodiment 1.

[0045] It is measured that the rejection rate of this PEI crosslinked non-layered graphene oxide membrane to toluene / water emu...

Embodiment 3

[0047] Ultrasound 20mg of graphene oxide in 2ml of deionized water for 1.5 hours to obtain a uniform graphene oxide water dispersion, add 0.25ml of aqueous solution of butanediamine with a concentration of 16mg / ml, stir vigorously to form a graphene oxide sol, and then add graphite oxide Slowly and evenly drop the alkene sol onto the non-woven fabric in the petri dish, put the petri dish into a sealed tank at 80°C and treat it for 8 hours, then filter and wash it with a lot of water to remove unreacted butanediamine, and then obtain the non-woven fabric Layered crosslinked graphene oxide films.

[0048] The prepared non-layered cross-linked graphene oxide membrane was placed on a suction filtration device for oil-water separation test. Experimental process is identical with embodiment 1.

[0049] It is measured that the rejection rate of this PEI crosslinked non-layered graphene oxide membrane to toluene / water emulsion, n-hexane / water emulsion, n-octane / water emulsion and Iso...

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Abstract

The invention discloses a preparation method of a non-layered cross-linked graphene oxide film. The preparation method comprises the following steps: firstly mixing poly-ammonia or an amino-terminated polymer with a graphene oxide water dispersion solution; uniformly dispersing to form graphene oxide sol; dropwise adding the graphene oxide sol into a substrate; and hermetically arranging at the temperature of 70 to 90 DEG C to obtain the non-layered cross-linked graphene oxide film. In the non-layered cross-linked graphene oxide film prepared by the method disclosed by the invention, a graphene oxide nanometer plate layer is formed by crosslinking the poly-ammonia and the amino-terminated polymer and is in irregular disordered orientation; the non-layered cross-linked graphene oxide film has super-hydrophilic properties and super-oleophobic properties underwater, high throughput and good pollution resistance and is suitable for separation of oil and water emulsion at normal pressure.

Description

technical field [0001] The invention relates to the field of film preparation, in particular to a non-layered cross-linked graphene oxide film and its preparation method and application. Background technique [0002] With the development of economy and society, the treatment of oily wastewater has increasingly become a global problem that threatens human health and the ecological environment. Traditional separation methods include air flotation, coagulation, adsorption, etc., but these methods are usually inefficient and also Not suitable for the separation of oil-water emulsions. As a relatively new separation method, the membrane method has gradually attracted people's attention. However, during the separation process, the surface of the membrane is easy to absorb oil droplets, causing serious membrane fouling and a sharp drop in flux, which affects the practicality of this technology. sex. Therefore, the preparation of antifouling membranes has become a hot spot. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B01D17/022
Inventor 张林黄铁凡
Owner ZHEJIANG UNIV
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