Development of Adsorbent Prussian Blue (PB) Impregnated through the Grafting of Covalent Organic Polymers (COPs) for the Removal of Radioactivity Cesium (Cs-137)

Abstract:

This study aims to utilize Prussian Blue (PB) to develop a high performance adsorbent for removing radioactive cesium from radioactive accidents. Prussian blue (PB) can adsorb selectively to cesium (Cs), which is high in adsorption efficiency, but has a disadvantage that it is difficult to recover after adsorption, so there is a high concern about secondary environmental pollution. Therefore, this study modified the surface of powder activated carbon (PAC) particles by using covalent organic polymer (COP) for stable immobilization of PB, and developed a PB-impregnated adsorbent (COP-PAC-PB). Synthesis of COP-PAC-PB was performed by sequentially reacting with iron (III) chloride and potassium ferrocyanide solution to synthesize PB in COP pore (In-situ). The maximum adsorption of COP-PAC-PB on cesium was 19 mg / g and the removal efficiency for radioactivity cesium (Cs-137, 60 Bq / kg) was 97.3%. In addition, PB was synthesized by the same method as that of COP-PAC-PB, which is a modification product of the unmodified group (PAC, Ox-PAC), and UV-vis analysis was performed to compare PB desorption characteristics after washing Respectively. In the unmodified group (PAC-PB, Ox-PAC-PB), a large amount of PB was desorbed when washed once to 6 times. In the case of COP-PAC-PB, it was not. As a result, the surface of the PAC particles was effectively modified using COP, and the adsorbent with Prussian blue stably immobilized was developed.

• Periodical: Key Engineering Materials (Volume 773)
• Pages: 405-409
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.773.405
• Online since: July 2018
• Authors: Bok Seong Kim, Young Sug Kim, Sung Won Kang, Dae Min Oh*, Sol Kim, Yu Hoon Hwang, Young Gyo Seo
• Keywords: Activated Carbon, Covalent Organic Polymers (COPs), Cs-137, Prussian Blue, Radioactive Adsorption

References

[1] T. J. Yasunari, A. Stohl, R. S. Hayano, J. F. Burkhart, S. Eckhardt, T. Yasunari, Cesium-137 deposition and contamination of Japanese soils due to the Fukushima nuclear accident, Proc. Nat. Acad. Sci. 108(49) (2011) 19530-19534.

DOI: 10.1073/pnas.1112058108

[2] C. Thammawong, P. Opaprakasit, P. Tangboriboonrat, P. Sreearunothai, Prussian blue-coated magnetic nanoparticles for removal of cesium from contaminated environment, J. Nanopart. Res. 15(6) (2013) 1689.

DOI: 10.1007/s11051-013-1689-z