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High-load ZIF-67 membrane material and preparation method thereof

A ZIF-67, high-load technology, applied in the field of membrane materials, can solve the problems of slow adsorption speed, increased time and cost of uranium extraction, and uranium adsorption performance needs to be improved.

Pending Publication Date: 2022-01-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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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. At the same time, the uranium adsorption performance needs to be improved

Method used

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  • High-load ZIF-67 membrane material and preparation method thereof
  • High-load ZIF-67 membrane material and preparation method thereof
  • High-load ZIF-67 membrane material and preparation method thereof

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preparation example Construction

[0028] The invention provides a kind of preparation method of high load ZIF-67 membrane material, comprises the following steps:

[0029] A) adopting the method of co-radiation grafting to graft maleic anhydride on the surface of the polymer base material to obtain the polymer base material of grafted maleic anhydride;

[0030] B) mixing metal salts, organic ligands, solvents and polymer base materials grafted with maleic anhydride, and reacting at 15-40°C to obtain high-loaded ZIF-67 membranes;

[0031] The metal salt is a cobalt salt;

[0032] The solvent includes methanol or water.

[0033] The present invention first adopts the co-radiation grafting method to graft maleic anhydride on the surface of the polymer base material. In some embodiments of the present invention, adopting the method for co-radiation grafting to graft maleic anhydride on the surface of the polymer base material includes:

[0034] In a sealed container, the tetrahydrofuran solution of maleic anhyd...

Embodiment 1

[0077] A 0.42 mm thick polypropylene (PP) non-woven fabric was ultrasonically cleaned in acetone, dried at 60°C and packed into an aluminum foil bag. Prepare a tetrahydrofuran solution of maleic anhydride with a mass fraction of 1.5 g / mL, then add the tetrahydrofuran solution of maleic anhydride and polypropylene non-woven fabric to the aluminum foil bag, so that the maleic anhydride solution is completely immersed in the polypropylene non-woven fabric, heat Plastic seal the aluminum foil bag, and put it into a radiation source (electron accelerator) to irradiate at room temperature, the radiation dose rate is 0.6kGy / h, and the radiation dose is 5kGy. The irradiated polypropylene non-woven fabric was ultrasonically cleaned with tetrahydrofuran and ethanol solvents in sequence, and dried at 60°C to obtain a polypropylene non-woven fabric grafted with maleic anhydride. The graft surface density of maleic anhydride was 26.70 nmol / cm 2 .

Embodiment 2

[0079] Will Co(NO 3 ) 2 ·6H 2 O (2.91g, 0.010mol) was dissolved in 50mL methanol to obtain the first solution; 2-methylimidazole (0.82g, 0.010mol) was dissolved in 200mL methanol to obtain the second solution; the first solution and the second After the solution was mixed, the polypropylene non-woven fabric (single area 50 * 200mm) of the grafted maleic anhydride prepared by 4 pieces of embodiment 1 2 ) into the mixed solution, the Co(NO 3 ) 2 ·6H 2 The ratio of the total molar amount of O and 2-methylimidazole to the surface area of ​​the polypropylene nonwoven fabric grafted with maleic anhydride is 49.97 μmol / cm 2 , reacted in a reactor at 25°C and 1 atm for 24h. After the reaction, the non-woven fabric membrane was washed with methanol and dried at 60°C to obtain a high-loaded ZIF-67 membrane (HF-1).

[0080] The high load ZIF-67 film (HF-1) that embodiment 2 obtains carries out scanning electron microscope analysis, and the result is as follows figure 1 shown. fig...

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Abstract

The invention relates to the technical field of membrane materials, in particular to a high-load ZIF-67 membrane material and a preparation method thereof. The preparation method of the high-load ZIF-67 membrane material comprises the following steps: A) grafting maleic anhydride on the surface of a macromolecular substrate material by adopting a co-radiation grafting method to obtain a macromolecular substrate material grafted with maleic anhydride; B) mixing a metal salt, an organic ligand, a solvent and the maleic anhydride grafted polymer substrate material, and reacting at 15-40 DEG C to obtain a high-load ZIF-67 membrane, wherein the metal salt is cobalt salt, and the solvent comprises methanol or water. The high-load ZIF-67 membrane material provided by the invention can be used for extracting uranium from seawater, in the process of extracting uranium from seawater, an imidazole group can be complexed with uranyl ions, meanwhile, cobalt has an affinity effect on the uranyl ions, uranium adsorption of the high-load ZIF-67 membrane material is facilitated, and the uranium adsorption performance of the high-load ZIF-67 membrane material is relatively excellent.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a high-load ZIF-67 membrane material and a preparation method 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 uranium reserves in seawater. At present, my country's ...

Claims

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Application Information

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