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Method for preparing polyamidoxime/graphene nanobelt composite aerogel and method for separating and enriching uranium

A graphene nanoribbon, composite aerogel technology, applied in chemical instruments and methods, carbon compounds, alkali metal compounds, etc., can solve the complex preparation process of carbon aerogel, low adsorption capacity and selectivity, and material structure. Easy to damage and other problems, to achieve the effect of fast adsorption, simple preparation method and easy operation

Inactive Publication Date: 2020-08-04
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] On the one hand, the present invention is to solve the technical problems of low grafting rate and uneven distribution of the existing amidoxime functionalization method, or high grafting rate and easy damage to the material structure; on the other hand, it is to solve the carbon airgel preparation process Complexity, low adsorption capacity and low selectivity, and provide a preparation method and application of polyamide oxime / graphene nanoribbon composite airgel

Method used

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  • Method for preparing polyamidoxime/graphene nanobelt composite aerogel and method for separating and enriching uranium
  • Method for preparing polyamidoxime/graphene nanobelt composite aerogel and method for separating and enriching uranium
  • Method for preparing polyamidoxime/graphene nanobelt composite aerogel and method for separating and enriching uranium

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Embodiment 1

[0045] The preparation method of the polyamidoxime / graphene nanoribbon composite airgel of the present embodiment is carried out in the following steps:

[0046] (1) Preparation of graphene oxide nanoribbons

[0047] Add 1 g of multi-walled carbon nanotubes into a three-necked flask filled with 150 mL of concentrated sulfuric acid with a concentration of 98% by mass, and stir at room temperature for 6 h. Then weigh 5g of potassium permanganate in the mixture and stir at room temperature for 1h. The mixture was heated to 55°C and reacted for 30min. Then raise the temperature to 70°C, keep it stable for 5 minutes, stop the reaction, and cool to room temperature. The mixture was poured into 400 mL of ice containing 5 mL of hydrogen peroxide, and filtered through a 5.0 μm polytetrafluoroethylene membrane. The solid matter was dissolved in 120 mL deionized water, ultrasonicated for 30 min, and dialyzed in a dialysis bag with a molecular weight cut-off of 3.5K for more than one w...

Embodiment 2

[0056] The preparation method of the polyamidoxime / graphene nanoribbon composite airgel of the present embodiment is carried out in the following steps:

[0057] (1) Preparation of graphene oxide nanoribbons

[0058] Same as step (1) of embodiment 1.

[0059] (2) Preparation of polyacrylonitrile / graphene nanoribbon composite hydrogel

[0060] Add 0.5g of graphene oxide nanobelts, 2.5g of acrylonitrile and 0.3g of ammonium persulfate into 15mL of deionized water, stir at 25°C for 2h, add the above solution to a hydrothermal reactor, react at 120°C for 24h, take it out, Cool to room temperature, immerse the solid in methanol, and wash repeatedly with deionized water to obtain polyacrylonitrile / graphene nanoribbon composite hydrogel.

[0061] (3) Preparation of polyamide oxime / graphene nanoribbon composite airgel

[0062] Weigh 1g of polyacrylonitrile / graphene nanoribbon composite hydrogel; weigh 1.5g of hydroxylammonium hydrochloride and add it to 50mL of ethanol and aqueous ...

Embodiment 3

[0065] The preparation method of the polyamidoxime / graphene nanoribbon composite airgel of the present embodiment is carried out in the following steps:

[0066] (1) Preparation of graphene oxide nanoribbons

[0067] Same as step (1) of embodiment 1.

[0068] (2) Preparation of polyacrylonitrile / graphene nanoribbon composite hydrogel

[0069] Add 0.2g of graphene oxide nanobelts, 1.2g of acrylonitrile and 0.1g of ammonium persulfate into 15mL of deionized water, stir at 25°C for 2h, add the above solution to a hydrothermal reactor, react at 180°C for 20h, take out , cooled to room temperature, submerged the solid in methanol, and washed repeatedly with deionized water to obtain a polyacrylonitrile / graphene nanoribbon composite hydrogel.

[0070] (3) Preparation of polyamide oxime / graphene nanoribbon composite airgel

[0071] Weigh 0.5g polyacrylonitrile / graphene nanoribbon composite hydrogel; weigh 0.75g hydroxylammonium hydrochloride and add it to 25mL ethanol and aqueous ...

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Abstract

The invention discloses a method for preparing polyamidoxime / graphene nanobelt composite aerogel and separating and enriching uranium, which is characterized by comprising the following steps of: firstly, axially cutting a multiwalled carbon nanotube by using a potassium permanganate oxidation method to prepare a graphene oxide nanobelt; then adding into a mixed solution of acrylonitrile and ammonium persulfate which are fully mixed, and primarily preparing polyacrylonitrile / graphene nanobelt composite hydrogel by adopting a solvothermal polymerization method; and then converting cyano groupsinto amidoxime groups by virtue of a reaction between the cyano groups and hydroxylamine under an alkaline condition so as to obtain polyamidoxime / graphene nanoribbon composite hydrogel, and finally,carrying out low-temperature freeze drying so as to obtain the polyamidoxime / graphene nanoribbon composite aerogel. The prepared polyamidoxime / graphene nanobelt composite aerogel is high in grafting rate, uniform in density distribution, stable in structural performance and rich in special functional groups of uranium, the uranium can be effectively and selectively removed from different uranium-containing water bodies, the adsorbed aerogel can be rapidly separated and recycled from a solid-liquid system, and no pollution is caused to the environment.

Description

Technical field: [0001] The invention belongs to the field of material synthesis and radioactive wastewater treatment, and relates to a method for preparing polyamidoxime / graphene nanobelt composite airgel, separating and enriching uranium-containing wastewater. Background technique: [0002] Uranium is an important nuclear fuel and one of the prerequisites for the development of nuclear power. In addition, uranium is also a potential radioactive poison. If it accumulates in a large amount in the environment, it will not only increase the background radiation of the environment, but also cause genetic variation of species due to its chemical toxicity, thus posing a potential threat to human survival and development. It should also be given great attention and corresponding measures should be taken. Therefore, the separation, enrichment and recovery of uranium from different uranium-containing aqueous media are of great significance for improving the utilization efficiency o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08F292/00C08F220/44C08F8/00C01B32/198B01J20/26B01J20/28B01J20/30G21F9/12C08L51/10
CPCC08J9/28C08F292/00C08F8/00C01B32/198B01J20/205B01J20/265B01J20/28047G21F9/12C08J2351/10C08J2201/0484
Inventor 王云李阳吴振宇何厚军胡学文刘佐聪涂鸿刘妍袁定重刘峙嵘
Owner EAST CHINA UNIV OF TECH
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