MOF membrane material for extracting uranium from water as well as preparation method and application of MOF membrane material

A membrane material, MOF technology, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve problems such as slow adsorption speed, increased time and cost of uranium extraction

Active Publication Date: 2021-12-21
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymer adsorbents currently have the problem of slow adsorption speed, which greatly increases the time and cost of uranium extraction.

Method used

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  • MOF membrane material for extracting uranium from water as well as preparation method and application of MOF membrane material
  • MOF membrane material for extracting uranium from water as well as preparation method and application of MOF membrane material
  • MOF membrane material for extracting uranium from water as well as preparation method and application of MOF membrane material

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preparation example Construction

[0025] The invention provides a method for preparing an MOF membrane material for extracting uranium from water, comprising the following steps:

[0026] A) immersing the polymer base material in an organic solution of maleic anhydride, and performing irradiation treatment to obtain a polymer base grafted with maleic anhydride;

[0027] B) mixing the zirconium salt, the cyano-modified organic ligand and the polymer substrate grafted with maleic anhydride in the step A), and reacting to obtain the MOF grafted material;

[0028] The cyano-modified organic ligand is prepared according to the following steps:

[0029] Mix the organic ligand and alkaline reagent in water, adjust the pH value to 5.0-5.5, then add acrylonitrile and hydroquinone, heat the system to react, then adjust the pH value to 2.0-3.0, filter and wash the solid and drying to obtain a cyano-modified organic ligand;

[0030] The organic ligand has a structure shown in formula I:

[0031]

[0032] C) subjecti...

Embodiment 1

[0058] Dissolve 4mmol of 2-aminoterephthalic acid and 6mmol of sodium hydroxide in 50mL of water. Add 10 mmol of acrylonitrile and 0.1 mmol of hydroquinone to the solution, stir and dissolve, and react at 100 degrees Celsius for 12 hours. After the reaction is over, add 30% hydrochloric acid to the system to fully separate out the precipitate, filter the precipitate, wash the precipitate with water and petroleum ether, and dry the precipitate in an oven at 60°C to obtain the cyano-modified ligand: 2- Cyanoterephthalic acid.

[0059] A 0.42 mm thick polypropylene non-woven fabric (PP) was ultrasonically cleaned in acetone, dried at 60°C and packed into an aluminum foil bag. Configure the maleic anhydride / tetrahydrofuran solution with a mass fraction of 50% at room temperature, then add the maleic anhydride solution and polypropylene non-woven fabric to the aluminum foil bag, make the maleic anhydride solution completely submerge the substrate, heat seal the aluminum foil bag a...

Embodiment 2

[0063] ZrCl 4 (3.0mmol) and 2-cyanoterephthalic acid (3.0mmol) are added in 60mlDMF by the molar ratio of 1:1, add reaction kettle after mixing evenly, with 10 pieces of polypropylene grafted maleic anhydride in embodiment 1 Non-woven fabric (4*4cm 2 ) is also added to the reactor, ZrCl 4 and the ratio of the total molar mass of 2-cyanoterephthalic acid to the area of ​​the MOF membrane is 37.5 μmol / cm 2 . React at 120°C for 24h. The obtained MOF membrane was ultrasonically cleaned with DMF and ethanol, and dried to obtain a MOF membrane. The synthesized MOF membrane was immersed in the ethanol solution of hydroxylamine hydrochloride and ethylenediamine, wherein the molar ratio of hydroxylamine hydrochloride to ethylenediamine was 1:1, and hydroxylamine hydrochloride was a saturated solution. The system was heated to reflux at 70°C, and after 30 hours of reaction, the membrane was taken out, ultrasonically cleaned with ethanol, and dried at 60°C to obtain a highly loaded ...

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Abstract

The invention provides a preparation method of an MOF membrane material for extracting uranium from water. The method comprises the following steps: modifying a ligand, then preparing a metal organic framework material UiO-66-CN, and finally, converting cyano groups in the material into amidoxime to selectively adsorb uranium, thereby greatly enhancing the adsorption capacity, selectivity and uranium extraction speed of uranium. According to the invention, a MOF layer is grown on the surface of a microporous polymeric membrane (such as a polypropylene non-woven fabric) in situ, so the stability of the material is improved, and the material is easy to recycle and post-process. The microporous structure of the polymeric membrane only supports the MOF layer with a nanometer thickness and does not affect the flux of the MOF layer, so a liquid permeation speed is greatly increased, and a uranium extraction speed is increased. The invention further provides the MOF membrane material for extracting uranium in water and application of the MOF membrane material.

Description

technical field [0001] The invention belongs to the technical field of organic polymer materials, and in particular relates to a MOF membrane material for extracting uranium in water, a preparation method and application thereof. Background technique [0002] In recent years, with the advancement of science and technology in human society and the rapid development of industry, energy consumption has increased day by day, leading to the increasingly scarce fossil fuel resources, and the excessive combustion of fossil fuels has also caused serious environmental problems such as the greenhouse effect and global warming. Solving energy shortages And environmental pollution has always been the theme of the times. As a new type of clean energy, nuclear energy is considered to be the best energy to replace fossil energy. Uranium is the most important dye in nuclear fission reactors, but the global exploitable ore uranium resources are very limited, only one thousandth of the urani...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C22B3/24C22B60/02D06M14/28D06M15/37D06M101/20
CPCB01J20/226B01J20/22B01J20/28033C22B3/24C22B60/0265D06M14/28D06M15/37D06M2101/20Y02P10/20
Inventor 张依帆高健魏巍柳美华郑春柏邓鹏飏
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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