Method for adsorbing radioactive iodine

A technology of radioactive iodine and adsorbent, applied in the direction of radioactive purification, separation methods, chemical instruments and methods, etc., can solve problems such as explosion and fire, and achieve the effect of maintaining fire resistance

Active Publication Date: 2019-11-26
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these solid sorbents for radioactive iodine treatment face fire and explosion hazards due to the presence of nitrogen oxides in the exhaust gas

Method used

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  • Method for adsorbing radioactive iodine
  • Method for adsorbing radioactive iodine
  • Method for adsorbing radioactive iodine

Examples

Experimental program
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Effect test

Embodiment 1

[0033] H 3 BO 3 (4g) and C 3 N 6 h 6 (4 g) was added to 200 mL of distilled water. The mixture was stirred to 85 °C for complete dissolution and stirring was continued for 6 hours, then cooled to ambient temperature to produce a white precipitate. After filtration, the precipitate was washed with cold deionized water and dried overnight to obtain the precursor. Transfer the precursor to a corundum tube. Porous boron nitride was subsequently produced by a multi-step pyrolysis process: the precursor was preheated at 550 °C for 2 h, then heated at 2 °C min -1 The rate was slowly heated to 1100°C and kept for 2 hours, and finally calcined at 1200°C for 4 hours. All reactions were carried out under the protection of argon.

Embodiment 2

[0035] H 3 BO 3 (4g) and C 3 N 6 h 6 (4 g) was added to 200 mL of distilled water. The mixture was stirred to 85 °C for complete dissolution and stirring was continued for 6 hours, then cooled to ambient temperature to produce a white precipitate. After filtration, the precipitate was washed with cold deionized water and dried overnight to obtain the precursor. Transfer the precursor to a corundum tube. Porous boron nitride was subsequently produced by a multi-step pyrolysis process: the precursor was preheated at 550 °C for 2 h, then heated at 2 °C min -1 The rate was slowly heated to 1100°C and kept for 2 hours, and finally calcined at 1250°C for 4 hours. All reactions were carried out under the protection of argon.

Embodiment 3

[0037] H 3 BO 3 (4g) and C 3 N 6 h 6 (4 g) was added to 200 mL of distilled water. The mixture was stirred to 85 °C for complete dissolution and stirring was continued for 6 hours, then cooled to ambient temperature to produce a white precipitate. After filtration, the precipitate was washed with cold deionized water and dried overnight to obtain the precursor. Transfer the precursor to a corundum tube. Porous boron nitride was subsequently produced by a multi-step pyrolysis process: the precursor was preheated at 550 °C for 2 h, then heated at 2 °C min -1 The rate was slowly heated to 1100°C and kept for 2 hours, and finally calcined at 1300°C for 4 hours. All reactions were carried out under the protection of argon.

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Abstract

The invention relates to a method for adsorbing radioactive iodine. A porous boron nitride material is taken as an adsorbent to adsorb radioactive iodine, and the fireproof property and acid resistance of the porous boron nitride material can be effectively maintained on the premise of maintaining high adsorption capacity on I2. The invention provides the method for capturing radioactive iodine byporous boron nitride for the first time, and practicability and iodine removal performance of the porous boron nitride is further researched. The porous boron nitride is revealed to have excellent thermal stability, acid resistance, oxidation resistance, and hydrophobicity through a series of tests on flammability, acid leaching durability and the like. The porous boron nitride has an excellent flame retardant property, and is superior to MOF and POP iodine removal materials which are well researched. Fire and explosion risks in exhaust flows can be greatly reduced by the advantages, and theporous boron nitride material is endowed with a great potential in actual post-treatment of radioactive waste. Due to porosity and interaction of Lewis acid and base, the level of adsorption capacityof porous boron nitride to iodine vapor is very high, and the porous boron nitride is a safe and effective radioactive iodine trapping agent in practical application.

Description

technical field [0001] The invention belongs to the technical field of nuclear waste treatment, and in particular relates to an adsorption method for radioactive iodine. Background technique [0002] Nuclear waste refers to radioactive materials that cannot be reused and are not allowed to be directly disposed of in the environment, including many kinds of substances. These substances not only vary greatly in activity and radiation half-life, but also vary greatly in form and chemical composition. Therefore, the disposal of nuclear waste is a major environmental problem, especially the proper disposal of radioactive iodine in the reprocessing of nuclear waste is recognized as a challenging subject. [0003] The discharge of iodine in nuclear waste will bring serious environmental pollution and have a huge impact on human metabolism. Therefore, the effective capture and storage of radioactive iodine is of great significance to human health and sustainable development. Curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01D53/02G21F9/02B01J20/30
CPCB01D53/02B01D2257/202B01J20/0248B01J20/0259G21F9/02
Inventor 逯乐慧艾可龙王娟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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