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Polyamidoxime-based chelating resin for extracting uranium from seawater and preparation method thereof

A chelating resin, polyamidoxime technology, applied in the field of new adsorption materials, can solve the problems of inability to guarantee complete conversion of nitrile groups, limited introduction of amidoxime groups, low adsorption performance, etc., and achieves fast adsorption speed and selectivity. Strong, high adsorption effect

Active Publication Date: 2020-05-19
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that it cannot ensure that the nitrile group is completely converted during the reaction, so the introduction of amidoxime group will be greatly limited.
Since the adsorbent relies largely on the complexation of the amidoxime group on its surface with uranyl ions to separate and enrich uranium from seawater, the adsorption of uranium by the amidoxime-based polymer prepared by the post-modification method Performance tends to be low, which largely limits the use of the method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example

[0032] Dissolve 3.45 g of hydroxylamine hydrochloride and 1.68 g of sodium bicarbonate in 50 mL of methanol, then slowly add 0.645 mL of 4-cyanostyrene, protect the system with argon, heat and stir under reflux for 6 h. After the reaction, it was extracted twice with ethyl acetate, spin-dried, washed out with n-hexane, and suction filtered to obtain the product p-amidoxime styrene.

[0033] Add 1 g of p-amidoxime styrene, 0.5 g of ethylene glycol dimethacrylate and 0.08 g of azobisisobutyronitrile into 5 mL of organic solvent, stir at 25 °C for 1 h, add the above solution Put it in a hydrothermal reaction kettle, react at 100 °C for 24 h, take it out, open the kettle, remove the organic solvent by rotary evaporation, and dry it in vacuum at 45 °C for 24 h to obtain polyamidoxime-based chelating resin P-1.

Embodiment 2

[0035] Polyamidoxime-based chelating resins can be prepared by solvothermal method. As a typical synthetic example:

[0036] Dissolve 3.45 g of hydroxylamine hydrochloride and 1.68 g of sodium bicarbonate in 50 mL of methanol, then slowly add 0.645 mL of 4-cyanostyrene, protect the system with argon, heat and stir under reflux for 6 h. After the reaction, it was extracted twice with ethyl acetate, spin-dried, washed out with n-hexane, and suction filtered to obtain the product p-amidoxime styrene.

[0037]Add 1 g of p-amidoxime styrene, 0.2 g of ethylene glycol dimethacrylate and 0.08 g of azobisisobutyronitrile into 5 mL of organic solvent, stir at 25 °C for 1 h, add the above solution Put it in a hydrothermal reaction kettle, react at 100°C for 24 hours, take it out, open the kettle, remove the organic solvent by rotary evaporation, and dry it in vacuum at 45°C for 24 hours to obtain polyamidoxime-based chelating resin P-2.

Embodiment 3

[0039] Accurately pipette 400 mL, 7.56 mg / L uranium standard solution into a 500 mL Erlenmeyer flask, adjust the pH value of the solution with 12 mol / L nitric acid, 1 mol / L NaOH solution and 5 mol / L NaOH solution, so that the solution The pH is 8.3. Add 0.003 g of adsorbent P-1, and adsorb on a constant temperature oscillator at 25 °C and 98 r / min for 3 h. After separation by filtration, the concentration of uranium ions in the filtrate was measured by Arsenazo III spectrophotometry, and the adsorption amount at this time was calculated to be 650 mg / g combined with formula (1).

[0040] The adsorption amount of uranium ions was calculated according to the following formula:

[0041] (1)

[0042] In the formula: q e —Adsorption capacity, mg / g; V—volume of uranium solution, L; C e —Equilibrium concentration of uranium ion solution, mg / L; C 0 —Initial concentration of uranium ion solution, mg / L; m—mass of adsorbent, g.

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Abstract

The invention relates to polyamidoxime-based chelating resin for extracting uranium from seawater and a preparation method thereof, and is characterized in that the polymer chelating resin is preparedby adopting a solvothermal method, and a chelating group is amidoxime; amidoxime styrene and ethylene glycol dimethacrylate are copolymerized under a solvothermal condition, and high-concentration amidoxime is immobilized on a polymer skeleton, so that the amidoxime chelating resin adsorbing material is prepared, and the amidoxime chelating resin adsorbing material is applied as a polymer adsorbent for separating and enriching uranium from seawater. The preparation route of the synthesized polyamidoxime-based chelating resin is simple and easy to operate. Meanwhile, the adsorbent has the advantages of being high in adsorption capacity, large in adsorption capacity, high in adsorption speed and the like when used for separating and enriching uranyl ions in seawater, is easy to separate from an aqueous solution, and can effectively adsorb and recover uranyl ions in the seawater solution.

Description

[0001] field of invention [0002] The invention relates to the field of novel adsorption materials, in particular to a polyamidoxime-based chelating resin used for extracting uranium from seawater and a preparation method thereof. Background technique [0003] Uranium is an important nuclear fuel resource. With the rapid development of nuclear energy, the demand for uranium in the nuclear industry is also increasing day by day. The proven terrestrial uranium resources are quite limited and can only meet the needs of nuclear energy for a few decades. The total amount of uranium contained in the world's seawater is about 4.5 billion tons, about 1,000 times that of land rocks, enough for human use for 72,000 years. Seawater is highly mobile, its concentration will quickly reach equilibrium, and it has no geographical restrictions, so it is a shared resource. If it can be developed stably, [0004] If there is an efficient, cheap and reusable method for extracting uranium from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/14C08F222/14B01J20/26C02F1/28B01J20/30C02F103/08
CPCC08F212/14B01J20/261C02F1/285C02F2103/08
Inventor 张世傲刘峙嵘张庆华张梦萌王云刘妍赵季洲左炙坪杨溢
Owner EAST CHINA UNIV OF TECH
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