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A kind of magnetic adsorbent and its preparation and treatment method for actinide waste liquid

A magnetic adsorbent, actinide technology, applied in adsorption water/sewage treatment, chemical instruments and methods, magnetic/electric field water/sewage treatment, etc. and other problems, to achieve the effect of convenient operation, shortened operation cycle and high separation efficiency

Active Publication Date: 2021-08-31
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of similar work are that the material preparation process is cumbersome, the synthesis operation requirements are high, and harsh reaction conditions are often required.
In addition, the excessive consumption of organic solvents is also likely to cause secondary pollution and higher production costs

Method used

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  • A kind of magnetic adsorbent and its preparation and treatment method for actinide waste liquid
  • A kind of magnetic adsorbent and its preparation and treatment method for actinide waste liquid
  • A kind of magnetic adsorbent and its preparation and treatment method for actinide waste liquid

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Experimental program
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Effect test

Embodiment 1

[0040] The present embodiment is the preparation method of magnetic adsorbent, comprising the following steps:

Embodiment 11

[0042] 0.1g polydopamine / silicon dioxide-coated magnetic microspheres were dispersed in 9.5mmol / L~20.5mmol / L 100mL aqueous solution of trishydroxymethylaminomethane, slowly added 0.1g aminoethylphosphonic acid ligand, adjusted The pH of the solution ranges from 8.5 to 10.0, and the temperature of the system is controlled at 60°C to 70°C. After heating and reflux for 4.0h to 6.0h, the mixture is stirred overnight at room temperature. The magnetic adsorbent in the suspension was separated by a magnet, washed alternately with water and ethanol, and then vacuum-dried at 60° C. for 12 hours to obtain the required magnetic adsorbent with a core-shell structure. The transmission electron microscope pictures of the magnetic adsorbent are shown in figure 1 As shown, it can be clearly observed that the magnetic adsorbent has a double-layer core-shell structure, the thickness of the inner silica shell layer is 20 nm, and the thickness of the outer polydopamine shell layer is 20 nm. Howe...

Embodiment 12

[0044] The amount of 0.1g of polydopamine / silica-coated magnetic microspheres dispersed in 9.5mmol / L-20.5mmol / L tris aqueous solution was 80mL and 120mL respectively, and other operating steps were the same as in Example 1.1. Compared with Example 1.1, the morphology of the prepared magnetic adsorbent with core-shell structure has no obvious change.

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Abstract

The invention discloses a magnetic adsorbent, its preparation and a treatment method for actinide waste liquid. The magnetic adsorbent of the present invention has a simple preparation process and mild operating conditions. By combining organic ligands and magnetic nanomaterials through polydopamine chemistry, a magnetic composite microsphere with a double-layer core-shell structure is constructed, which solves the problem of traditional adsorbent solidification. However, there are many problems such as difficult liquid separation, complicated synthesis steps, and large consumption of organic solvents. The magnetic adsorbent of the invention exhibits good adsorption performance on actinide elements in a weakly acidic environment, has fast separation speed and is easy to recycle, and has important practical significance in the purification and recovery of nuclear fuel reprocessing radioactive waste liquid.

Description

technical field [0001] The invention belongs to the field of resource utilization and environmental protection, and in particular relates to a magnetic adsorbent, its preparation and a method for treating actinide waste liquid. Background technique [0002] With the rapid development of nuclear energy, it is inevitable to accumulate a large amount of radioactive waste liquid in nuclear facility activities related to nuclear energy development and weapon development. It has the characteristics of strong radioactivity, high toxicity and long half-life, and constitutes a long-term radioactive hazard to humans and the natural environment. Therefore, it is of great practical significance to study economical, green, and efficient separation materials and technologies to achieve efficient separation of actinides in the fields of nuclear fuel reprocessing and environmental protection. [0003] In recent years, solid-phase extraction technology has shown a good application prospect ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28C02F1/28C02F1/48B01J20/30
CPCB01J20/103B01J20/26B01J20/28009B01J20/28019C02F1/288C02F1/48
Inventor 吴奉承杨楚汀韩军胡胜罗阳明刘易
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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