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Preparation method of a covalent organic framework hydrogel and its application to adsorb uranium

A technology of covalent organic frameworks and hydrogels, applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc., can solve problems that have not yet been seen, and achieve high availability, improved utilization, and selectivity Good results

Active Publication Date: 2022-03-22
NANCHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports of COFs-based hydrogel materials, nor have there been reports of COFs-based hydrogel materials used to extract uranium

Method used

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  • Preparation method of a covalent organic framework hydrogel and its application to adsorb uranium
  • Preparation method of a covalent organic framework hydrogel and its application to adsorb uranium
  • Preparation method of a covalent organic framework hydrogel and its application to adsorb uranium

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1: Preparation and characterization of thiazole-linked covalent organic frameworks

[0032] 2,4,6-triformylphloroglucinol (Tp, 10.50 mg, 0.05 mmol), 2,6-diaminoanthracene (Da, 15.62 mg, 0.075 mmol) and elemental sulfur (14.4 mg, 0.45 mmol) were added To a Pyrex tube, acetic acid (6M, 0.10ml), dimethyl sulfoxide (0.05ml), o-dichlorobenzene (0.45ml) and n-butanol (0.50ml) were added to the Pyrex tube, and the mixture was sonicated for 10 Minutes to mix well, degas through three freeze-pump-thaw cycles, seal the flame of the Pyrex tube and place it in an oven at 120°C for 72 hours, cool to room temperature, separate the precipitate from the reaction product by vacuum filtration, and The precipitate was washed three times with acetone and tetrahydrofuran successively, and the resulting solid was vacuum-dried at 90 °C for 12 hours, and the powder was collected to prepare a thiazole-linked covalent organic framework (Tp-Sa).

[0033] figure 1 Schematic diagram of th...

Embodiment 2

[0036] Example 2: Preparation of covalent organic framework hydrogels

[0037] (1) Preparation of polydopamine-modified covalent organic framework: disperse 200mg covalent organic framework Tp-Sa in Tris buffer solution (50mL, 10mmol, pH 8.5), then add 100mg dopamine, stir at room temperature for 12 hours, The resulting product was washed with ultrapure water and dried in vacuum at 60°C for 12 hours to obtain a polydopamine-modified covalent organic framework (Tp-Sa / PDA);

[0038] (2) Preparation of covalent organic framework hydrogel: polyvinyl alcohol (PVA, 1 g), glutaraldehyde (225 μL) and ultrapure water (10 mL) were ultrasonically mixed, and then hydrochloric acid (500 μL, 1.2M) and 300mg of Tp-Sa / PDA, reacted for 3 hours, immersed the product in ultrapure water overnight, then placed it in the refrigerator to freeze, then thawed in ultrapure water, repeated freezing and thawing 3 times, and then freeze-dried to make a total Hydrovalent organic framework hydrogel (CPP). ...

Embodiment 3

[0040] Example 3: Adsorption of uranium in uranium-doped seawater by covalent organic framework hydrogel

[0041] Add 5 mg of covalent organic framework hydrogel CPP to 500 mL of seawater supplemented with 35 mg / L uranyl ions, adjust the pH of the seawater to 5.0 with sodium hydroxide or nitric acid, and stir magnetically for 10 hours under dark conditions. Take out 2 mL of seawater every hour, filter it with a 0.22 μm membrane filter, collect the filtrate, measure the content of uranyl ions in the filtrate by inductively coupled plasma mass spectrometry, and calculate the adsorption capacity of covalent organic framework hydrogel CPP for uranyl ions under dark conditions . The formula for calculating the adsorption capacity is as follows: t =(C o –C t ) / m×V, V is the solution volume, unit L; m is the amount of covalent organic framework hydrogel, unit g; C o is the initial concentration of uranyl ions in mg / L; C t is the equilibrium concentration of uranyl ions, in mg / L....

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Abstract

The invention discloses a preparation method of a covalent organic framework hydrogel and its application for adsorbing uranium, belonging to the technical field of environmental protection. Thiazole-linked covalent organic frameworks were synthesized via a one-pot method, and the dopamine-modified frameworks were then covalently cross-linked into polyvinyl alcohol polymers to form covalent organic framework hydrogels. The covalent organic framework hydrogel prepared by the method of the invention has strong visible light absorption ability, can utilize its photothermal performance to promote the rapid diffusion and mass transfer of uranyl ions, and increase the adsorption capacity for uranium. Thanks to the dense hydroxyl and thiazole rings on the covalent organic framework, the covalent organic framework hydrogel has good selectivity for the adsorption of uranium. The method for preparing the covalent organic framework hydrogel of the invention is simple, the process is controllable, the structure is stable, and the cost is low, and the high-efficiency adsorption of uranium in seawater can be realized, and the method has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method of a covalent organic framework hydrogel and its application for adsorbing uranium. Background technique [0002] With the growth of population and economy, the human demand for energy has increased dramatically. Nuclear energy is a clean energy that does not produce greenhouse gases, has extremely high energy density, and will become one of the main clean energy sources in the future. Uranium is a key element in the nuclear industry. Seawater contains about 4.5 billion tons of uranium. Extracting uranium from seawater is expected to meet the growing energy needs of mankind. Porous organic framework materials can extract uranium from seawater (Q.Sun, B.Aguila, J.Perman, A.S.Ivanov, V.S.Bryantsev, L.D.Earl, C.W.Abney, L.Wojtas, S.Ma, Bio-inspired nano-traps for uranium extraction from seawater and recovery from nuclear waste. Nat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L29/04C08L87/00B01J20/26B01J20/28C02F1/28C02F103/08C02F101/00
CPCC08J3/075B01J20/267B01J20/28047C02F1/288C08J2329/04C08J2487/00C02F2103/08C02F2101/006
Inventor 邱建丁张程蓉崔伟荣梁汝萍
Owner NANCHANG UNIV
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