Magnetic cesium ion adsorbent and preparation method therefor

Abstract

The present invention discloses a preparation method for a magnetic cesium ion adsorbent. The preparation method comprises the steps of: A, coating carboxylated silicon dioxide on the surface of ferroferric oxide to obtain coated ferroferric oxide; B, mixing the coated ferroferric oxide with an aminated crownether derivative to obtain a first mixture; C, placing the first mixture and a condensation agent in a first solvent to be stirred, and performing a reaction at 50-90 DEG C for 2-4 h to obtain a second mixture, wherein the first solvent can dissolve the aminated crownether derivative and the condensation agent; and D, solid-liquid separating the second mixture to obtain a first solid phase, and washing and drying the first solid phase to obtain a magnetic cesium ion adsorbent. The present invention also discloses a magnetic cesium ion adsorbent obtained by the preparation method. The adsorbent has good cesium ion adsorption selectivity, and retains stable adsorption performance after using in repeated adsorption-desorption cycles. The magnetic 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 magnetic 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 a...

AI Technical Summary

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.