UNIST develops material structure that quickly adsorbs radioactive materials

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Korean researchers have developed a structure in which thin unit materials such as ‘paper sheets’ are erected vertically and then joined to a two-dimensional structure. Since it can adsorb gas quickly, it is expected to be applied to remove dangerous gases or to store gaseous fuels such as hydrogen and methane.

 

Professor Jong-Beom Baek of the Department of Energy and Chemical Engineering at the Ulsan Institute of Science and Technology (UNIST) announced on the 27th that it has developed a material with excellent gas storage capacity and adsorption of dangerous substances by implementing a ‘vertical 2-dimensional stacked structure’.

A 2D material is a thin material with a regular structure. There are many attempts to store or adsorb gases. This is because there are holes (pores) through which the gas can move. However, when the two-dimensional material is layered, the layer-to-layer bond becomes stronger and the space between layers becomes narrower. The space to store the gas is insufficient.

The team solved the problem by changing the structure of the two-dimensional material. When the rings were facing each other (horizontal), the interlayer bonding was strong, but the principle of loosening when stacked vertically was used. The loosening of the interlayer bonds increases the space between the layers, allowing more gas to be trapped.

The team confirmed that the structure quickly adsorbs and removes the radioactive material iodine (iodine) gas. Iodine gas is known to be a material that is difficult to adsorb. “The adsorption rate is the fastest among the materials used as gas adsorbents,” the researchers explained. The amount of adsorption was also twice that of the existing horizontal structure.

In addition, the structure is stable, and it withstands high temperatures of 600 ℃. The research team said, “It made all parts of the structure into a ring shape to increase the chemical and thermal stability of the existing two-dimensional organic porous structure.” It can be used in various high-temperature processes. ”

 

Professor Baek said, “Since the discovery of graphene, a carbon-based two-dimensional material, attempts to utilize the two-dimensional material have been increasing steadily.” “I realized a two-dimensional structure.”

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