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Graphene oxide membrane with tent-like structures, and preparation method and application thereof

A technology of graphene membrane and graphene membrane, which is applied in the field of ultra-thin graphene oxide and its preparation, can solve the problem of weakening selectivity, difficult adjustment of sieving channels at the molecular level, precise control of the distance between graphene membrane layers, etc. problem, to achieve the effect of increasing water flux, realizing water flux, and maximizing

Active Publication Date: 2020-03-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this electrostatic spraying method can realize the intercalation of nanoparticles between graphene film layers, it cannot precisely control the distance between graphene film layers at the molecular level.
Although increasing the distance unilaterally can increase the water flux, it will inevitably weaken the selectivity of the membrane itself.
At the same time, the method of electrostatic spraying is difficult to precisely control the amount of graphene oxide film added, the uniformity of the film structure cannot be guaranteed, and it is also difficult to realize the preparation of ultra-thin structure films.
[0005] In summary, although many studies have proposed methods for adjusting the internal structure of graphene oxide membranes, according to the existing technology, it is still difficult to adjust the molecular level of the sieving channel of graphene oxide in the water environment, and realize the adjustment of the internal structure of the graphene oxide membrane. Selective Separation of Mixed Small Molecules in Water
Ultrathin graphene oxide membrane structure has been reported, but the traditional filtration assembly method is not reliable, and the prepared ultrathin structure often has tiny breakages.
In addition, the existing structural control strategies are difficult to adjust the contradiction between water flux and selectivity of graphene oxide membranes, and obtaining higher water flux by increasing sieving channels is often at the expense of the selectivity of the membrane itself. cost

Method used

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  • Graphene oxide membrane with tent-like structures, and preparation method and application thereof
  • Graphene oxide membrane with tent-like structures, and preparation method and application thereof
  • Graphene oxide membrane with tent-like structures, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0064] Utilize the improved filtration assembly method among the present invention to prepare the concrete process of ultra-thin graphene oxide film as follows:

[0065] (1) Place the buffer layer (mixed cellulose ester film) on the peeling funnel, wet it with water, and make the two fully bonded.

[0066] (2) Place the support film (polycarbonate film) on the buffer layer and wet it with water to make the two fully bonded.

[0067] (3) Prepare a graphene oxide dispersion with a concentration of 1.5 mg / L, and ultrasonically disperse it for 10 minutes.

[0068] (4) Take 10 ml of the prepared graphene oxide dispersion, filter and assemble under a vacuum pressure of 0.9 bar to obtain a membrane structure.

[0069] (5) The obtained membrane structure is dried at 60°C.

Embodiment 2-5

[0086] In order to allow researchers in the field to better understand the construction of tent-like nanostructures in ultra-thin graphene oxide films, we will further illustrate the present invention through specific examples and accompanying drawings below. The specific steps of the ultra-thin graphene oxide film with a tent-like structure are as follows:

[0087] (1) Place the buffer layer (mixed cellulose ester film) on the peeling funnel, wet it with water, and make the two fully bonded.

[0088] (2) Place the support film (polycarbonate film) on the buffer layer and wet it with water to make the two fully bonded.

[0089] (3) configure graphene oxide dispersion liquid, and silicon dioxide (30nm) dispersion liquid joins in graphene oxide dispersion liquid, wherein the concentration of graphene oxide is controlled at 1.5mg / L, the amount of silicon dioxide added is the same as The mass ratios of graphene oxide are 0.01:1, 0.1:1, 1:1 and 10:1 respectively, and are respectiv...

Embodiment 6

[0108] In order to confirm the possibility of other nanoparticles constructing tent-like structures, we later selected silver nanoparticles with an average diameter of 1 μm and an average size of 10 nm for experiments. The preparation process of the material is consistent with that of Example 3. Such as Figure 22 As shown, Example 6 has a tent-like structure similar to that of Example 3, but the size of the constructed tent-like structure is different due to the difference in the size of the nanoparticles. Since the screening performance and part of the surface properties of the membrane are determined by its microstructure, the adjustment of the membrane screening performance and surface properties can also be realized through the adjustment of the nano-silver intercalation ratio. Example 6 shows that according to the method of the present invention, nanoparticles of different sizes and materials can also realize the construction of nano-tent structures between ultra-thin g...

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Abstract

The invention discloses a graphene oxide membrane with tent-like nanostructures as well as a preparation method and application thereof. According to the invention, an improved filter assembly methodis established so as to realize reliable preparation of an ultra-thin graphene oxide membrane on a flexible substrate. By intercalating nanoparticles into an ultra-thin structure, construction of tent-like nanostructures in the ultra-thin structure is realized The special tent-like nanostructures are capable of realizing maximum water flux under the premise of retaining retention performance. By adjusting intercalation ratio of the nanoparticles, regulation on sieving channels of the graphene oxide membrane can be realized on the molecular scale; and moreover, selective separation on small molecules of similar sizes is also enabled. The tent-like nanostructures of the graphene oxide membrane in aqueous solutions of different pH values are stable; and moreover, surface roughness, wettability and surface electrical property of the graphene oxide membrane are adjustable. The graphene oxide membrane with the tent-like nanostructures has excellent separation performance, as well as adjustable structures and properties; and thus, the graphene oxide membrane with the tent-like nanostructures has very broad application prospects in the fields of environmental pollution control and membraneseparation technology.

Description

technical field [0001] The invention belongs to the field of preparation of environment-friendly materials, and in particular relates to an ultra-thin graphene oxide with a tent-like structure and a preparation method and application thereof. Background technique [0002] Membrane separation technology is a technology that uses pore sieving to achieve selective separation of nanoparticles, molecules and ions. The membrane separation process plays an irreplaceable role in the fields of chemical purification, resource recovery and environmental pollution control. Recently, graphene oxide films have attracted extensive attention from scientific research and industry due to their special interlayer structure. Different from traditional membrane materials, the sieve pores of graphene oxide membranes are two-dimensional interlayer spaces. Joshi et al. found that in aqueous solution, the interlayer distance of graphene oxide film is about 0.9nm, and its sieving channel can accura...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/10B01D69/12B01D67/00C02F1/44
CPCB01D67/0039B01D69/10B01D69/12B01D71/021C02F1/44
Inventor 陈宝梁杨凯杰
Owner ZHEJIANG UNIV
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