Preparation method of amidoxime group uranium extraction sorbent

An amidoxime-based and adsorbent technology, applied in chemical instruments and methods, uranium compounds, inorganic chemistry, etc., can solve the problems of low mechanical properties, low adsorption capacity, and slow adsorption rate of adsorption materials, and achieve enhanced mechanical strength, The effect of high adsorption capacity and strong adsorption selectivity

Inactive Publication Date: 2009-12-09
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

However, the current axime amine-based adsorbents still have problems such as slow adsorption rate, low adsorption capacity, and low mechanical properties of the adsorbent materials.

Method used

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  • Preparation method of amidoxime group uranium extraction sorbent
  • Preparation method of amidoxime group uranium extraction sorbent
  • Preparation method of amidoxime group uranium extraction sorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) TiO 2 Sol preparation

[0019] At room temperature, 20 mL of butyl titanate (Ti(OBu) 4 ) and 6ml of acetylacetone (acac) were dissolved in 50mL of absolute ethanol, after fully reacting, 80mL of H 2 A solution formed of O, 1mL HCl and 150ml ethanol was slowly added dropwise to the above solution under vigorous stirring. After reacting for about half an hour, a uniform, stable and transparent yellow sol was obtained.

[0020] (2) Preparation of amidoxime-based adsorbent

[0021] Add 40ml of organic solvent dimethyl sulfoxide (DMSO) and 2.78g NH 2 OH·HCl was solid, slightly heated, stirred and dissolved, and 2.12 g of anhydrous sodium carbonate was added (the molar ratio to hydroxylamine hydrochloride was 1:0.5). After dissolving, add 2g of polyacrylonitrile powder, heat to 70°C and stir to dissolve, and pass through N 2 , react for 3h, then add TiO 2 The sol is stirred evenly, washed with water, washed with ethanol, and dried to prepare a hybrid amidoxime-based...

Embodiment 2-6

[0024] Using the same preparation steps as in Example 1, different amounts of TiO were added 2 sol, examine different TiO 2 The effect of content on the uranium adsorption capacity and mechanical strength of amidoxime-based adsorbent materials.

[0025] Table 1 Different TiO 2 Effect of content on uranium adsorption capacity of amidoxime-based uranium extraction adsorbent

[0026]

[0027] As can be seen from the table, with TiO 2 The more the amount of sol added, the adsorption amount of uranium on the adsorbent decreased slightly, but at the same time it was found that the addition of TiO 2 The higher the amount of sol, the better the mechanical properties of the adsorbent.

Embodiment 7

[0029] The amidoxime-based uranium-extracting adsorbent prepared in Example 2 was used to investigate its adsorption selectivity for uranium in the presence of calcium and magnesium ions. For UO in a ratio equivalent to 10 times the concentration of seawater concentration 2 2+ , Mg 2+ , Ca 2+ Three ions are adsorbed. The concentration of uranium in the solution before and after adsorption was determined by ultraviolet spectrophotometry, and the concentration of calcium and magnesium ions was determined by titration. The distribution coefficient D and the selectivity coefficient K are calculated by the following formulas respectively:

[0030] D = ( A 0 - A f ) V A f W ...

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Abstract

The invention discloses a preparation method of amidoxime group uranium extraction sorbent, comprising the following steps: firstly, adopting polyacrylonitrile powder as a raw material, producing uranium extraction sorbent containing amidoxime group by amidoximation; adding titanium dioxide sol which is prepared by the sol-gel method for blending to ensure that the weight percent of titanium dioxide and polyacrylonitrile is 0.4-2.0%; producing hybridized amidoxime group uranium extraction sorbent by water washing, alcohol washing and drying. The invention has the advantages that the amidoxime group uranium extraction sorbent material which is hybridized with titanium dioxide has higher mechanical strength, higher adsorption quantity of uranium, and higher adsorption selectivity to uranium in the presence of calcium and magnesium ions.

Description

technical field [0001] The invention relates to a preparation method of a uranium adsorbent, in particular to a preparation method of an amidoxime group-containing adsorbent for extracting uranium. Background technique [0002] As we all know, uranium resources are of great significance to industry, agriculture, national defense and science and technology. Uranium resources on land are increasingly scarce, so extracting uranium from seawater has broad prospects for development. Although the average uranium content in seawater is 3.2 mg / ton, the total amount of uranium contained in seawater is very rich, about 4 billion tons of uranium, which is equivalent to 4000 times the uranium reserves on land. [0003] The main form of uranium in seawater is the stable uranyl tricarbonate complex ion UO 2 (CO 3 ) 3 4- . Because the concentration of uranium in seawater is very low, it is the most ideal method to extract uranium from seawater by adsorption. The key to the adsorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/26C01G43/00
Inventor 王铎朱桂茹刘梅
Owner OCEAN UNIV OF CHINA
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