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Continuous ZIF-67 membrane material and preparation method thereof

A technology of ZIF-67 and membrane materials, which is applied in the field of membrane materials, can solve problems such as slow adsorption speed, uranium adsorption performance needs to be improved, increase the time and cost of uranium extraction, and achieve excellent uranium adsorption performance, good application prospects, The effect of easy recycling and post-processing

Pending Publication Date: 2021-12-21
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • Continuous ZIF-67 membrane material and preparation method thereof
  • Continuous ZIF-67 membrane material and preparation method thereof
  • Continuous ZIF-67 membrane material and preparation method thereof

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preparation example Construction

[0046] The invention provides a kind of preparation method of continuous ZIF-67 membrane material, comprises the following steps:

[0047] A) calculate the required maleic anhydride graft surface density of continuous ZIF-67 film material by formula (1);

[0048]

[0049] In formula (1), σ molar Maleic anhydride graft surface density required for continuous ZIF-67 membrane material, nmol / cm 2 ;

[0050] BET is the specific surface area of ​​the polymer substrate material, m 2 / g;

[0051] ρ is the mass areal density of the polymer base material, g / cm 2 ;

[0052] A is Avogadro's constant;

[0053] a is the spacing between adjacent maleic anhydrides, nm;

[0054] B) according to the calculation result of step A), the method of co-radiation grafting is used to graft maleic anhydride on the surface of the polymer base material to obtain the polymer base material grafted with maleic anhydride;

[0055] C) mixing metal salts, organic ligands, solvents, and grafted maleic...

Embodiment 1

[0127] The surface maleic anhydride graft surface density is calculated as follows:

[0128] The crystal structure of ZIF-67 is as figure 1 as shown, figure 1 is the crystal structure of ZIF-67. In the ZIF-67 lattice, the distance between adjacent metals includes three distances of 1, 2, and 3, and the length of distance 1 to 3 ranges from 0.85 to 1.9 nm. Since zinc ions need to coordinate with maleic anhydride, ZIF- 67 The nucleation points on the surface of the non-woven fabric make the continuous film grow further, so the distance a between the nucleation points is the distance between maleic anhydrides. When a is 0.85-1.9nm, a continuous film can be formed on the surface. In the present embodiment, the BET specific surface area of ​​the non-woven fabric is 10.16m 2 / g, mass areal density ρ is 0.012g / cm 2 , Avogadro's constant A is 6.02×10 23 . According to the formula (1), calculate the maleic anhydride graft surface density σ molar 28~93.7nmol / cm 2 . Therefore, w...

Embodiment 2

[0130] 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 2.7kGy / h, and the radiation dose is 20kGy. 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 surface density of maleic anhydride grafted was 29.88 nmol / cm 2 .

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Abstract

The invention relates to the technical field of membrane materials, in particular to a continuous ZIF-67 membrane material and a preparation method thereof. The preparation method of the continuous ZIF-67 membrane material comprises the following steps: A) conducting calculating through a formula (1) to obtain the maleic anhydride grafting surface density required by the continuous ZIF-67 membrane material; B) according to the calculation result of the step A), grafting maleic anhydride on the surface of the polymer substrate material by adopting a co-radiation grafting method to obtain a polymer substrate material grafted with maleic anhydride; and C) mixing a metal salt, an organic ligand, a solvent and the maleic anhydride grafted polymer substrate material, and conducting reacting at 15-40 DEG C to obtain a continuous ZIF-8 membrane material, wherein the metal salt is cobalt salt, and the solvent comprises methanol or water. The prepared continuous defect-free membrane has the advantages that the uranyl ions are cleared based on the ZIF-8 size effect, the affinity of the uranyl ions and imidazole groups to the uranyl ions is separated, the uranyl ions and the imidazole groups act synergistically, and the uranium adsorption performance is excellent.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to a continuous 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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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30D06M14/28D06M15/37C22B3/24C22B60/02
CPCB01J20/226B01J20/22B01J20/28033D06M14/28D06M15/37C22B3/24C22B60/0265D06M2101/20Y02P10/20
Inventor 邓鹏飏张依帆高健郑春柏魏巍柳美华
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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