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Cesium ion adsorbing agent and preparing method thereof

A technology of adsorbent and cesium ion, which is applied in the field of cesium ion adsorbent and its preparation, can solve the problems of difficult to prepare chromatographic column, large exchange potential, complicated steps, etc., and achieve strong cesium ion adsorption selectivity, stable structure and properties , 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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 complex 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 chromatogram. 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. Therefore, the solvent extraction method has problems such as high extraction agent price, large amount of use, large recovery loss, and toxicity of some reagents.

Method used

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  • Cesium ion adsorbing agent and preparing method thereof
  • Cesium ion adsorbing agent and preparing method thereof
  • Cesium ion adsorbing agent and preparing method thereof

Examples

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Effect test

Embodiment 1

[0027] This embodiment provides a cesium ion adsorbent, which includes carboxylated ferric oxide and 2-aminomethyl-18-crown-6 condensed and linked with the carboxylated ferric oxide through amidation.

[0028] It is worth noting that, in this embodiment, the carboxylation of ferric oxide refers to having several carboxyl groups on the surface of ferric oxide particles, rather than carboxyl groups attached to each ferric oxide molecule. Such as figure 1 Shown is the structural representation of described carboxylated ferric oxide; figure 1 In , the shaded part represents the interior of Fe3O4 particles, from figure 1 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 COOH, that is to say, the surface of the ferric oxide particle has been carboxylated, and the carboxylated ferric oxide particle has been obtained. Iron, and the carboxyl group can be condensed with the aminated crown ether derivati...

Embodiment 2

[0043] 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 carboxylated ferric oxide and the 4-amino group connected to the carboxylated ferric oxide by amidation condensation Benzo-18-crown-6.

[0044] The difference between the preparation method of the cesium ion adsorbent of the present embodiment and the preparation method in Example 1 is that in step one, the ratio of 1 g of ferric citrate and citric acid is 1:50 according to the ratio of the amount of substance Mix to obtain a third mixture; add deionized water to the third mixture to make 80 mL of the first solution, place the first solution in a hydrothermal reactor and heat it up to 220°C, and keep it at this temperature. Heat reaction for 24 hours to obtain the fourth mixture; for the rest, refer to ...

Embodiment 3

[0053] 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 carboxylated ferric oxide and 4-amino di Benzo-18-crown-6.

[0054] The difference between the preparation method of the cesium ion adsorbent of the present embodiment and the preparation method in Example 1 is that in step one, the ratio of 1g ferrous ammonium sulfate and oleic acid according to the amount of substance is 1:10 Mix according to the ratio to obtain the third mixture; add deionized water to the third mixture to make 80mL of the first solution, place the first solution in a hydrothermal reaction kettle and raise the temperature to 220°C, and keep it at this temperature Undergo hydrothermal reaction for 24 hours to obtain the fourth mixture; for the rest, refer to step 1 in Example 1 to obt...

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Abstract

The invention discloses a preparing method of a cesium ion adsorbing agent. The preparing method comprises the steps that firstly, carboxyl ferroferric oxide is prepared; secondly, carboxyl ferroferric oxide and a condensing agent are mixed, and a first mixture is obtained; thirdly, the first mixture is put into a solvent and stirred, an amination crown ether derivative is then added into the solvent, a reaction is carried out at the temperature ranging from 60 DEG C to 80 DEG C for at least 2 hours, and a second mixture is obtained, wherein the solvent is used for dissolving the amination crown ether derivative and the condensing agent; fourthly, the second mixture is subjected to solid and liquid separation, a first solid phase is obtained, cleaned and dried, and the cesium ion adsorbing agent is obtained. The invention further discloses the cesium ion adsorbing agent prepared through the method. The cesium ion adsorbing agent has high cesium ion adsorption selectivity and magnetism, and stable adsorption performance is maintained in the recycle use of adsorption and desorption. The cesium ion adsorbing agent can be applied to adsorption separation of cesium ions form radioactive nuclear waste, a polyion competing system and the like.

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 + The significance is very significant. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/58
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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