Amidoxime group uranium extraction sorbent and preparation method thereof

An amidoxime-based, adsorbent technology, applied in chemical instruments and methods, uranium compounds, inorganic chemistry, etc., can solve the problems of shortening the service life of materials, poor hydrophilicity, slow adsorption speed, etc. Water-based enhanced, highly selective effect

Inactive Publication Date: 2011-10-12
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently prepared amidoxime-based materials are mainly polymer materials such as resins and fibers. Among them, resins have poor hydrophilicity and slow adsorption speed; although fibers have fast adsorption rates, they have low mechanical strength and are easy to absorb in seawater. swelling, shortening the life of the material

Method used

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  • Amidoxime group uranium extraction sorbent and preparation method thereof
  • Amidoxime group uranium extraction sorbent and preparation method thereof
  • Amidoxime group uranium extraction sorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Dissolve 1.0 g of nonionic surfactant P123 in 37.5 mL of 1.6 mol / L hydrochloric acid solution, and stir at room temperature until clear. Then add mixed silicon esters (TEOS and CTES), stir at 40°C for 22h, transfer the reaction liquid to a reaction kettle with polytetrafluoroethylene, leave it to age at 70°C for 24h, then cool, filter and dry. The molar ratio of each raw material used in the experiment is P123:H 2 O:HCl:CTES:TEOS=0.017:193.3:5.9:0.2:0.8.

[0027] 2) Disperse 1.0 g of the dried synthetic material in 1) in 150 mL of absolute ethanol containing 2.0 g of concentrated hydrochloric acid, stir at 50°C for 6 hours, then filter, wash with absolute ethanol, and dry to obtain the cyano-functionalized organic - Inorganic hybrid porous materials;

[0028] From figure 2 It can be seen that the adsorption equilibrium isotherm of the material is type IV, indicating that the material has mesopores. The material has a specific surface area of ​​533m 2 / g, the po...

Embodiment 2

[0033] 1) Dissolve 1.0 g of nonionic surfactant P123 in 37.5 mL of 1.6 mol / L hydrochloric acid solution, and stir at room temperature until clear. Then add mixed silicon esters (TEOS and CTES), stir at 80°C for 10h, transfer the reaction liquid to a reaction kettle with polytetrafluoroethylene, leave it to age at 60°C for 24h, then cool, filter and dry. The molar ratio of each raw material used in the experiment is P123:H 2 O:HCl:CTES:TEOS=0.017:193.3:5.9:0.4:0.6.

[0034] 2) Disperse 1.0 g of the dried synthetic material in 1) in 150 mL of absolute ethanol containing 2.0 g of concentrated hydrochloric acid, stir at 50°C for 6 hours, then filter, wash with absolute ethanol, and dry to obtain the cyano-functionalized organic - Inorganic hybrid porous material; the specific surface area of ​​the material is 312m 2 / g, the pore diameter is 2.68nm, and the cyano group content is 4.30mmol / g.

[0035] 3) In a 100mL three-necked flask, 0.76g of nitrile functionalized material (NH ...

Embodiment 3

[0037] Pipette 50 mL of U(VI) solution with an initial concentration of 100 μg / mL, adjust the pH of the solution to ≈6, add 0.01 g of the adsorbent prepared in Example 1, shake and balance at 30 ° C for 90 min, filter, and use Arsenazo III spectrophotometry The concentration of U(VI) in the solution before and after adsorption was analyzed by the method, and the amount of uranium adsorbed was calculated.

[0038] From Figure 5 It can be seen that the adsorption rate of U(VI) on the material is very fast. This is because the adsorbent used has a large specific surface area, a mesoporous pore structure, and strong hydrophilicity, which reduces the adsorption capacity of uranyl ions. The mass transfer resistance makes it easy for uranyl ions to contact with the amidoxime adsorption sites, thereby increasing the adsorption rate. The equilibrium adsorption capacity is as high as 310mg / g.

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Abstract

The invention relates to an amidoxime group uranium extraction sorbent and a preparation method thereof. The preparation method comprises the following steps: on the basis of utilizing an organic estersil containing nitrile groups and Si(OR)4 as a mixed silicone source and a nonionic type surface active agent as a structural guide agent, performing hydrolyzation and polymerization under an acidic condition to obtain a nitrile group functional organic-inorganic hybridized porous material; and reacting the nitrile group functional organic-inorganic hybridized porous material with hydroxylamine to obtain the amidoxime group uranium extraction sorbent. In the invention, cyanogroup is introduced into an inorganic material by virtue of hydrolytic condensation reaction, and the amidoxime group functional organic-inorganic hybridized porous material is prepared by virtue of amidoximation. Compared with the polymer material, the sorbent related by the invention has the advantages of obviously increased mechanical strength, strengthened hydrophilism and high uranium adsorption quantity; the amidoxime group functional organic-inorganic hybridized porous material has quite high selection to uranium almost without the interference of other coexisting ions in the solution containing Na<+>, K<+>, Ca<2+> and Mg<2+>.

Description

technical field [0001] The invention belongs to the technical field of uranium adsorbent, and relates to an amidoxime-based adsorbent for extracting uranium and a preparation method thereof. Background technique [0002] Uranium is an important strategic energy material, which is of great significance to industry, agriculture, national defense and science and technology. The heat released by 1 kg of uranium 235 is equivalent to the heat released by 2700 tons of coal. Therefore, nuclear power generation using uranium as fuel is an effective way to avoid the transportation and consumption of a large amount of fuel and reduce environmental pollution. With the development of the world's nuclear energy industry, people's demand for uranium is increasing day by day, and the world's average annual consumption is 7.0×10 4 tons of uranium, while the total reserves of uranium on land are only 3.0×10 6 tons, only enough for human use for several decades. The average uranium content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C01G43/00
Inventor 朱桂茹郭风高从堦
Owner OCEAN UNIV OF CHINA
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