KR-102962738-B1 - METHOD FOR PRODUCING ADSORBENT OF REMEDIATION OF RADIOACTIVE CONTAMINANTS

Abstract

The present invention relates to a method for manufacturing a radioactive contaminant adsorbent. The method for manufacturing a radioactive contaminant adsorbent according to the present invention is characterized by comprising: (a) a step of preparing a glucose solution by dissolving glucose in water; (b) a step of dispersing a magnetic material by adding it to the glucose solution; (c) a step of dispersing an adsorbent capable of adsorbing radioactive contaminants by ion exchange action by adding it to the glucose solution; and (d) a step of synthesizing an adsorbent in which a magnetic material and an adsorbent are dispersed by heating the glucose solution in an autoclave reactor to synthesize an adsorbent in which a magnetic material is bonded to the surface of the adsorbent.

Inventors

• 조동완
• 김재곤
• 전철민
• 류정호
• 박지원
• 임길재
• 정영욱
• 지상우

Assignees

• 한국지질자원연구원

Dates

Publication Date

20260508

Application Date

20220726

Claims (9)

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5. (a) A step of preparing a glucose solution by adding glucose to water and dissolving it; (b) a step of adding and dispersing a magnetic material into the glucose solution; (c) a step of adding and dispersing an adsorbent capable of adsorbing radioactive contaminants by ion exchange action into the glucose solution; and (d) a step of synthesizing an adsorbent in which the magnetic material and the adsorbent are dispersed in a glucose solution by heating the glucose solution in a hydrothermal autoclave reactor to form an adsorbent in which the magnetic material is bonded to the surface of the adsorbent; comprising During the hydrothermal synthesis process in the autoclave reactor, the glucose is carbonized and acts as an adhesive, thereby attaching the magnetic material to the surface of the adsorbent. A method for manufacturing a radioactive contaminant adsorbent, characterized in that the magnetic body is formed with a particle size in the range of 1/200 to 1/100 relative to the particle size of the adsorbent material.
6. In paragraph 5, A method for manufacturing a radioactive contaminant adsorbent, characterized in that, before synthesizing the adsorbent in the autoclave reactor, the adsorbent and the magnetic material are dispersed in the glucose solution, wherein the magnetic material is mixed in a range of 5 to 15 parts by weight and the glucose is mixed in a range of 20 to 60 parts by weight per 100 parts by weight of the adsorbent.
7. In paragraph 5, A method for manufacturing a radioactive contaminant adsorbent, characterized in that the magnetic material is magnetite with a size of 50 to 100 nanometers.
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9. In paragraph 5, A method for manufacturing a radioactive contaminant adsorbent, characterized in that the heating temperature in the above-mentioned autoclave reactor is in the range of 150 to 170°C.

Description

Method for producing adsorbent of remeditation of radioactive contaminants and adsorbent using the same The present invention relates to environmental pollution reduction technology, and in particular to an adsorbent for adsorbing and removing radioactive contaminants present in soil and water, and a method for manufacturing the same. Radioactive contaminants such as cesium and strontium are substances that emit radiation energy and enter the environment due to various issues such as nuclear tests, nuclear accidents, waste leaks, and nuclear decommissioning. During the radioactive decay of radioactive materials, ionizing radiation such as alpha (α) particles, beta (β) particles, gamma (γ) rays, or neutrons is emitted, and these act as environmental hazards. The degree of risk is determined by the concentration of the radioactive material, the energy of the emitted radiation, the type of radiation, and how close the radionuclide is to the human body. Excessive exposure of the human body to alpha particles, beta particles, gamma rays, and X-rays emitted from radionuclides can cause tissue damage or alteration. Damage occurs most severely in tissues or organs where cell division is active. In particular, germ cells are significantly affected, which can lead to genetic mutations. Therefore, excessive exposure to radionuclides carries a high risk of birth defects and cancer development. Adsorbents are being actively researched as one of the technologies for removing radioactive contaminants, and layered metal sulfides or Prussian blue are showing excellent effects in adsorbing radioactive contaminants. However, the above-mentioned adsorbents are primarily used underwater, and the problem of having to recover them from the water after use remains. One could consider fixing the adsorbent to a support, membrane, or filter to facilitate recovery; however, since the adsorbent has a particle size of about 10 μm, it is difficult to fix it to a support or similar material, and consequently, recovery is not easy. FIG. 1 is a schematic flowchart of a method for manufacturing a radioactive contaminant adsorbent according to an example of the present invention. Figures 2 and 3 are intended to illustrate the adsorption of radioactive materials by the ion exchange action of KAT-2 and KTS-3 adsorbents, respectively. The table in Figure 4 shows the mixing ratios of the three adsorbents prepared in the experiment. Figures 5 to 8 are tables showing the results of radioactive material adsorption experiments. Figure 8 shows the XRD results of the KTS-3 adsorbent and the adsorbent according to the present invention. ※ It should be noted that the attached drawings are provided as examples for reference to help understand the technical concept of the present invention, and the scope of the rights of the present invention is not limited by them. In describing the present invention, detailed descriptions of related known functions are omitted if they are deemed obvious to a person skilled in the art and could unnecessarily obscure the essence of the invention. First, the background of the present invention will be explained. The researchers of the present invention investigated a method to impart magnetism to layered metal sulfide materials or Prussian blue, which are recognized for their excellent performance as radioactive material adsorption materials, in order to solve the problem of difficulty in recovering them after use. Generally, two methods for imparting magnetism can be considered. The first method involves directly binding magnetic materials to an adsorbent using the co-precipitation method. In the iron co-precipitation method, when Fe ions and an adsorbent are mixed in water and the pH is increased, iron ions bind to (co-precipitate) the adsorbent. Since iron is bound to the adsorbent, the entire material becomes magnetic. However, magnetizing the adsorbent via the co-precipitation method as described above presents a problem in that the adsorption capacity of the adsorbent is reduced. Specifically, radioactive contaminants are adsorbed onto the layers or surfaces of the adsorbent through ion exchange with potassium ions within the adsorbent. However, during the process of magnetizing the adsorbent using the co-precipitation method, divalent or trivalent iron ions are pre-entered through ion exchange at the adsorption sites (layers or surfaces) where contaminants are to be adsorbed, which can significantly reduce the adsorption capacity. In addition to the coprecipitation method, another approach to physically combining adsorbents and magnetic materials involves immobilizing them within alginate beads or polyvinyl alcohol beads. However, when adsorbents are immobilized using relatively large beads (5 mm or larger), the adsorption rate of radioactive materials may be significantly slowed due to ion permeability issues, and the adsorption capacity of radioactive contaminants per unit mass of adsorbent may be substantially red