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Cesium ion adsorbent and preparation method thereof

An adsorbent and cesium ion technology, applied in the field of cesium ion adsorbent and its preparation, can solve the problems of difficult to obtain a chromatographic column, high price of extraction agent, complicated steps, etc., achieve strong cesium ion adsorption selectivity, and improve preparation efficiency , the effect of rapid solid-liquid separation

Active Publication Date: 2016-02-17
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The precipitation method is mainly suitable for extracting Cs from rock mineral resources + , such as extracting Cs from carnallite, lepidolite, cesium garnet + , but this method is an intermittent operation with complicated steps, high labor intensity, and difficult solid-liquid separation operation
The ion exchange method has the advantages of simple operation process, strong mechanical, thermal and radiation stability, and good resistance to Cs + It has the advantages of very significant selectivity, etc., but the inorganic ion exchanger has high solubility in water, while the organic ion exchanger has a large exchange potential for high-valent ions. When high-valent ions coexist, there will be great interference, and it is difficult to obtain a satisfactory product. Chromatographic column
in Cs + Among the separation and extraction methods, the solvent extraction method is a separation technology that has been studied more, widely used, and developed rapidly in recent years. The solvent extraction method separates and extracts Cs + The extraction agents used mainly include reagents such as crown ether, calixarene, dipicrylamine and its derivatives. However, the solvent extraction method has problems such as high price of the extraction agent, large dosage, large recovery loss, and toxicity of some reagents.

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  • Cesium ion adsorbent and preparation method thereof
  • Cesium ion adsorbent and preparation method thereof
  • Cesium ion adsorbent and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0031] The present embodiment provides a cesium ion adsorbent, which includes hydroxylated ferric oxide and (+)-(18-crown which is linked to the hydroxylated ferric oxide by hydrogen bonding with a mass ratio of 38:1. -6)-2,3,11,12-tetracarboxylic acid.

[0032] In the present embodiment, the specific surface area of ​​the hydroxylated iron tetroxide in the cesium ion adsorbent is 213m 2 / g.

[0033] It is worth noting that, in this embodiment, the hydroxylated Fe3O4 means that several hydroxyl groups are attached to the surface of the Fe3O4 particles, but not every molecule of Fe3O4 is attached with a hydroxyl group. Such as Figure 1 to Figure 3 As shown, the structure of the hydroxylated ferric oxide includes three kinds; Figure 1 to Figure 3 In , the shaded part represents the interior of Fe3O4 particles, from Figure 1 to Figure 3 It can be clearly seen that the O atom is located on the surface of the ferric oxide particle, and the O atom is also connected with an H ...

Embodiment 2

[0049] In the description of Embodiment 2, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 2 and embodiment 1 is that the cesium ion adsorbent in embodiment 2 includes hydroxylated ferric oxide and 4-aminobenzo-18-crown-6 with a mass ratio of 42:1, and The specific surface area of ​​the hydroxylated ferric oxide is 194m 2 / g.

[0050] The difference between the preparation method of the cesium ion adsorbent in this example and the preparation method in Example 1 is that in step 1, 1.3mmol iron source, 7mL ethylene glycol and 25mL deionized water are mixed and stirred for 0.5h , obtain the third mixture; Utilize 0.6mol / L aqueous ammonia solution to adjust the pH value of the third mixture to 9.0; keep the third mixture with the pH value of 9.0 in the hydrothermal reactor with a temperature rise of 5° C. / min Raise the temperature to 180°C, and keep it at this temperatu...

Embodiment 3

[0059] In the description of Embodiment 3, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 3 and embodiment 1 is that the cesium ion adsorbent in embodiment 3 includes hydroxylated ferric oxide and 4'-carboxybenzo-18-crown-6 with a mass ratio of 34:1, And the specific surface area of ​​the hydroxylated ferric oxide is 233m 2 / g.

[0060] The difference between the preparation method of the cesium ion adsorbent in this example and the preparation method in Example 1 is that in step 1, 0.87mmol iron source, 3mL glycerol and 30mL deionized water are mixed and stirred for 0.5h , obtain the third mixture; Utilize the aqueous ammonia solution of 0.4mol / L to adjust the pH value of the third mixture to 9.0; all the other referring to step one in Example 1, the obtained specific surface area is 233m 2 / g of hydroxylated ferric oxide.

[0061] In step 2, the hydroxylated ferr...

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Abstract

The invention discloses a preparation method of cesium ion adsorbent. The method includes the steps that A, hydroxylation ferroferric oxide is prepared; B, hydroxylation ferroferric oxide is mixed with crown ether derivatives to obtain a first mixture; C, the first mixture is placed in solvent, stirred at the temperature of 50-80 DEG C and subjected to reflux for 1-2 h to obtain a second mixture, wherein the solvent is used for dissolving the crown ether derivatives; D, the second mixture is separated to obtain a first solid phase, the first solid phase is washed and dried, and the cesium ion adsorbent is obtained. The invention further discloses the cesium ion adsorbent prepared through the method, and the cesium ion adsorbent has high adsorption capacity and strong cesium ion adsorption selectivity; meanwhile, the cesium ion adsorbent has magnetism, and rapid solid-liquid separation can be achieved after cesium ions in a solution containing cesium ions are completely adsorbed. The cesium ion adsorbent can be used for adsorbing and separating out cesium ions from, for example, radioactive nuclear waste and multi-ion competition systems.

Description

technical field [0001] The invention belongs to the technical field of composite functional materials, and in particular relates to a cesium ion adsorbent and a preparation method thereof. Background technique [0002] Cs in salt lakes in my country + Rich in resources, research on how to extract and isolate Cs from salt lakes + It means a lot. Currently for Cs + The separation and extraction mainly include precipitation method, ion exchange method and solvent extraction method. The precipitation method is mainly suitable for extracting Cs from rock mineral resources + , such as extracting Cs from carnallite, lepidolite, cesium garnet + , but this method is an intermittent operation with complicated steps, high labor intensity, and difficult solid-liquid separation operation. The ion exchange method has the advantages of simple operation process, strong mechanical, thermal and radiation stability, and good resistance to Cs + It has the advantages of very significant s...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30
Inventor 刘忠王亚斌许乃才董亚萍李武
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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