Silver-based composite adsorbent for removing radioactive iodine as well as preparation method and application of silver-based composite adsorbent

A compound technology of radioactive iodine and silver, which is applied in the direction of radioactive purification, radioactive pollutants, chemical instruments and methods, etc., can solve the problems of high mobility, human metabolic disorder, and increased risk of thyroid cancer, and achieve high efficiency and preparation The process is simple and the effect of improving chemical stability

Active Publication Date: 2021-09-24
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, 129I has the risk of long-term disposal due to its long half-life (1.6×107 years), high toxicity and high mobility, while 131I Although the half-life (8 days) is short, it is easy to accumulate in the thyroid gland in the human body. Long-term exposure to radioactive iodine will lead to metabolic disorders, mental retardation and increase the risk of thyroid cancer

Method used

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  • Silver-based composite adsorbent for removing radioactive iodine as well as preparation method and application of silver-based composite adsorbent
  • Silver-based composite adsorbent for removing radioactive iodine as well as preparation method and application of silver-based composite adsorbent
  • Silver-based composite adsorbent for removing radioactive iodine as well as preparation method and application of silver-based composite adsorbent

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Experimental program
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preparation example Construction

[0031] Such as image 3 Shown, a kind of preparation method for removing the silver-based composite adsorbent of radioactive iodine, comprises following process:

[0032] S101: Preparation of silver nanoparticle suspension by hydrothermal method

[0033] Under stirring at room temperature, add sodium borohydride solution dropwise to silver nitrate solution to obtain a mixed solution, the color of the mixed solution gradually transitions from light yellow to dark gray, and then heat the mixed solution to 75°C for 2 hours to decompose the mixed solution excess sodium borohydride and cooled to room temperature to obtain a silver nanoparticle suspension.

[0034] In this embodiment, the volume ratio of the sodium borohydride solution and the silver nitrate solution is 1:1.

[0035] In this embodiment, the concentration of the sodium borohydride solution is 4 mmol / L, and the concentration of the silver nitrate solution is 1 mmol / L.

[0036] S102: Preparation of silver-based comp...

Embodiment 1

[0041] Under normal temperature stirring, 50mL of 4mmol / L sodium borohydride solution was added dropwise to 50mL of 1mmol / L silver nitrate solution to obtain a mixed solution, the color of the mixed solution gradually changed from light yellow to dark gray, and then the mixed solution was heated to 75° C., holding time for 2 hours to decompose excess sodium borohydride in the mixed solution, and cooling to room temperature to obtain a silver nanoparticle suspension. Dissolve 2g of polyvinylpyrrolidone in 100mL of the above-mentioned silver nanoparticle suspension, slowly add 1mL of pyrrole under stirring, continue stirring for 10min, add 1g of silver nitrate and stir until fully dissolved, let it stand for 48h, and treat it after the reaction is completed. The precipitate was washed twice with ultrapure water and ethanol in sequence, and then the washed precipitate was centrifuged at a speed of 5000r / min to obtain an isolate, and finally the isolate was vacuum-dried at room tem...

Embodiment 2

[0043] Under normal temperature stirring, 50mL of 4mmol / L sodium borohydride solution was added dropwise to 50mL of 1mmol / L silver nitrate solution to obtain a mixed solution, the color of the mixed solution gradually changed from light yellow to dark gray, and then the mixed solution was heated to 75° C., holding time for 2 hours to decompose excess sodium borohydride in the mixed solution, and cooling to room temperature to obtain a silver nanoparticle suspension. Dissolve 2.5g of polyvinylpyrrolidone in 100mL of the above-mentioned silver nanoparticle suspension, slowly add 1mL of pyrrole under stirring, continue stirring for 15min, add 1.1g of silver nitrate and stir until fully dissolved, let it stand for 48h, and wait for the reaction to complete Finally, the precipitate was washed twice with ultrapure water and ethanol in sequence, and then the washed precipitate was centrifuged at a speed of 5000r / min to obtain an isolate, and finally the isolate was vacuum-dried at roo...

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Abstract

The invention provides a silver-based composite adsorbent for removing radioactive iodine, the silver-based composite adsorbent for removing radioactive iodine is spherical, and the silver-based composite adsorbent for removing radioactive iodine has a core-shell structure, the silver-based composite adsorbent for removing the radioactive iodine comprises a central core and a shell covering the surface of the central core, the central core is silver, the shell is a cationic polymer, and meanwhile, the invention further provides a preparation method of the silver-based composite adsorbent for removing the radioactive iodine. According to the silver-based composite adsorbent for removing radioactive iodine and the preparation method of the silver-based composite adsorbent, the surfaces of the silver nanoparticles are coated with the cationic polymer, so that the chemical stability of a silver nanoparticle adsorption material is effectively improved on the premise of keeping high adsorption performance on radioactive iodine; the preparation method of the composite adsorbent for removing radioactive iodine is controllable and high in efficiency.

Description

technical field [0001] The invention relates to an adsorption material for treating radioactive waste water, in particular to a silver-based composite adsorbent for removing radioactive iodine and a preparation method thereof. Background technique [0002] With the large-scale application and development of nuclear energy, the environmental and safety problems caused by nuclear waste have gradually attracted worldwide attention. Nuclear power plants provide energy for the development of society, and at the same time, produce a large number of artificial radionuclides, including 129 I and 131 I, these nuclides will cause serious harm to human health and bring permanent environmental pollution. The radioactive iodine produced during the operation of nuclear power plants is easily dissolved in water and easily migrates and diffuses with water bodies. In addition, iodine is easy to volatilize and will be discharged into the environment along with the flue gas generated by nucl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/02C02F1/28G21F9/12
CPCB01J20/02B01J20/26G21F9/12C02F1/285C02F1/281B01J2220/4806B01J2220/4812C02F2101/006
Inventor 朱琳段涛赵倩
Owner SOUTHWEAT UNIV OF SCI & TECH
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