Radioactive cesium adsorbent and method of removing radioactive cesium using the same

Patent metadata

Field	Value
Publication number	US-2020027615-A1
Application number	US-201816189840-A
Country	US
Kind code	A1
Filing date	Nov 13, 2018
Priority date	Dec 28, 2017
Publication date	Jan 23, 2020
Grant date	—

Abstract

A radioactive cesium adsorbent includes photocatalyst particles and Prussian blue. The ferric ions of the Prussian blue are reduced to ferrous ions by activation of the photocatalyst particles. A method of removing radioactive cesium using the radioactive cesium adsorbent includes preparing a composition comprising photocatalyst particles and Prussian blue; preparing a precursor solution by mixing radioactive cesium and the composition prepared in the preparing of a composition; and reducing ferric ions of the Prussian blue to ferrous ions by activating the photocatalyst particles in the precursor solution prepared in the preparing of a precursor solution.

First claim

What is claimed is:

1 . A radioactive cesium adsorbent comprising:
photocatalyst particles; and Prussian blue, wherein ferric ions of the Prussian blue are reduced to ferrous ions by activation of the photocatalyst particles.

2 . The radioactive cesium adsorbent according to claim 1 , wherein the photocatalyst particles comprise one or more selected from the group consisting of TiO 2 , ZnO, WO 3 , SnO 2 , CdS, and Fe 2 O 3 .

3 . The radioactive cesium adsorbent according to claim 1 , wherein activation of the photocatalyst particles is caused by UV light within a wavelength range within which the photocatalyst particles are activated.

4 . The radioactive cesium adsorbent according to claim 1 , wherein the Prussian blue comprises a compound represented by Formula 1:

5 . A method of removing radioactive cesium, comprising:
preparing a composition comprising photocatalyst particles and Prussian blue; preparing a precursor solution by mixing radioactive cesium and the composition prepared in the preparing of a composition; and reducing ferric ions of the Prussian blue to ferrous ions by activating the photocatalyst particles in the precursor solution prepared in the preparing of a precursor solution.

6 . The method according to claim 5 , wherein, in the preparing of a precursor solution, a total concentration of the photocatalyst particles and the Prussian blue contained in the precursor solution is 2 to 20 g/L.

7 . The method according to claim 5 , wherein, in the reducing, activation of the photocatalyst particles is caused by UV light within a wavelength range within which the photocatalyst particles are activated.

8 . The method according to claim 7 , wherein the wavelength range within which the photocatalyst particles are activated is more than 300 nm and less than or equal to 500 nm.

9 . The method according to claim 7 , wherein the UV light within the wavelength range is radiated from the outside for 10 minutes to 10 hours, and a total amount of radiation of the external UV light per hour is 300 to 5,000 mJ/cm 2 .

10 . The method according to claim 9 , wherein the external UV radiation is performed at pH 2 to pH 10.

11 . The method according to claim 9 , wherein the external UV radiation is performed under a nitrogen atmosphere.

Assignees

• Korea Atomic Energy Res
• Daegu Gyeongbuk Inst Science & Tech

Inventors

• Kim Hyuncheol
• Kim Soonhyun
• Kim Minsun
• Lim Sang Kyoo
• Lee Wanno

Classifications

• C02F2101/006

  Radioactive compounds · CPC title

• B01J21/063

  Titanium; Oxides or hydroxides thereof · CPC title

• C02F1/288

  using composite sorbents, e.g. coated, impregnated, multi-layered · CPC title

• C02F2305/10

  Photocatalysts · CPC title

• C02F1/281

  using inorganic sorbents · CPC title