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Cesium ion adsorbent and preparation method therefor

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, 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: 2016-03-02
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • 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.

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  • Cesium ion adsorbent and preparation method therefor
  • Cesium ion adsorbent and preparation method therefor
  • Cesium ion adsorbent and preparation method therefor

Examples

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Effect test

Embodiment 1

[0027] This embodiment provides a cesium ion adsorbent, which includes aminated ferric oxide and (+)-(18-crown-6)-2 which is condensed and linked with the hydroxylated ferric oxide through amidation ,3,11,12-tetracarboxylic acid.

[0028] It is worth noting that, in this embodiment, the amination of ferric oxide refers to that several amino groups are attached to the surface of ferric oxide particles, but not every molecule of ferric oxide is attached with an amino group. Such as figure 1 Shown is the structural representation of described aminated 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 atoms are located on the surface of the ferric oxide particles, and the O atoms are also connected with NH 2 , that is to say, the surface of the ferric oxide particle has been aminated, and the aminated ferric oxide has been obtained, and the amino group can be condensed and connected with the c...

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 aminated ferric oxide and the (-) -(18-crown-6)-2,3,11,12-tetracarboxylic acid.

[0044] The difference between the preparation method of the cesium ion adsorbent of this embodiment and the preparation method in Example 1 is that in step 1, the ratio of 0.5g ferric citrate and ethylenediamine according to the amount of substance is 1:200 The ratio was mixed to obtain the third mixture; deionized water was added to the third mixture to make 80mL of the first solution, the first solution was placed in a hydrothermal reactor and heated to 220°C, and kept at this temperature. Heat reaction for 24 hours to obtain the fourth mixture; for the rest, refer to step 1 in Example 1 to obtain aminated ferric oxide. ...

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 aminated ferric oxide and 4'- Carboxybenzo-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 0.1g ferric amine citrate and ethylenediamine according to the amount of substance is 1: Mix at a ratio of 40 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 reactor and raise the temperature to 160°C, and keep it at this temperature Undertake hydrothermal reaction for 24 hours to obtain the fourth mixture; for the rest, refer to step 1 in Example 1 to obtain aminated fe...

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Abstract

The present invention discloses a preparation method for a cesium ion adsorbent. The preparation method comprises the steps of: A, preparing aminated ferroferric oxide; B, mixing a carboxylated crownether derivative and a condensation agent to obtain a first mixture; C, placing the first mixture in a solvent to be stirred, adding the aminated ferroferric oxide into the solvent and performing a reaction at 40-80 DEG C for at least 1 h to obtain a second mixture, wherein the solvent is used for dissolving the carboxylated crownether derivative and the condensation agent; and D, performing solid-liquid separation on the second mixture to obtain a first solid phase, and washing and drying the first solid phase to obtain a cesium ion adsorbent. The present invention also discloses a cesium ion adsorbent obtained by the preparation method. The adsorbent has good cesium ion adsorption selectivity and magnetic properties, and retains stable adsorption performance after using in repeated adsorption-desorption cycles. The cesium ion adsorbent disclosed by the present invention can be applied to adsorbing and separating the cesium ion from systems such as radioactive waste and ionic 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 + 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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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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