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

Patent metadata

Field	Value
Publication number	US-10850251-B2
Application number	US-201816189840-A
Country	US
Kind code	B2
Filing date	Nov 13, 2018
Priority date	Dec 28, 2017
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

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 method of removing radioactive cesium, comprising:
preparing a composition comprising photocatalyst particles and Prussian blue;
mixing radioactive cesium and the composition to provide a precursor solution; and
applying UV light to the precursor solution under a nitrogen atmosphere to activate the photocatalyst particles for causing reduction of ferric ions of the Prussian blue to ferrous ions.

2. The method according to claim 1 , wherein the photocatalyst particles and the Prussian blue contained in the precursor solution is 2 to 20 g/L.

3. The method according to claim 1 , the UV light has a wavelength sufficient to activate the photocatalyst particles.

4. The method according to claim 3 , wherein the wavelength is longer than 300 nm and shorter or equal to 500 nm.

5. The method according to claim 3 , wherein the UV light is applied for 10 minutes to 10 hours, and application of the UV light per hour is 300 to 5,000 mJ/cm 2 .

6. The method according to claim 5 , wherein applying the UV light is performed at pH 2 to pH 10.

7. The method 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 .

8. The method according to claim 1 , wherein the Prussian blue comprises a compound represented by Formula 1:

Assignees

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

Inventors

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

Classifications

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• B01J19/123 Primary

  Ultraviolet light · CPC title

• B01J20/223 Primary

  containing metals, e.g. organo-metallic compounds, coordination complexes · CPC title

• C01B3/042

  Decomposition of water (by electrolysis of water C25B1/04) · CPC title

• C01G23/047

  Titanium dioxide · CPC title