HOME > Achievement > Publications
| 제목 | Simultaneous removal of cesium and iodate using prussian blue functionalized CoCr layered double hydroxide (PB-LDH) (2022) | ||||
|---|---|---|---|---|---|
|
Simultaneous removal of cesium and iodate
using prussian blue functionalized CoCr layered double hydroxide (PB-LDH)
(2022)
Jueun Kim, Jaehyuk Kang, Wooyong Um
Journal of Environmental Chemical Engineering, Volume 10, Issue 3,2022,107477
DOI : https://doi.org/10.1016/j.jece.2022.107477 (https://www.sciencedirect.com/science/article/pii/S2213343722003505)
Abstract: Radioactive cesium and iodine
have become an emerging issue because these radionuclides have high
radiotoxicity and solubility, and they can easily transport to the surrounding
environment. Prussian blue, known as metal hexacyanoferrate compound, has a
cubic face-centered structure and similar ionic size to Cs+, known to be used
for Cs+ removal. In addition, layered double hydroxides (LDHs) have anion
exchange properties and become the promising sorbents of iodine. In this study,
based on the advantages of both Prussian blue (PB) and layered double hydroxide
(LDH), Prussian blue functionalized layered double hydroxide (PB-LDH) was
synthesized to concurrently remove both Cs+ and IO3− from radioactive solutions. During the
synthesis of PB-LDH, Fe(CN)64− does not intercalate
into the LDH structure, but aggregates on the LDH surface according to
electrostatic force and ion-specific effects and forms the PB on the surface of
LDH. The synthesized PB-LDH simultaneously removed 32 mg/g of Cs+ and 91 mg/g
of IO3− from the mixed waste solutions. The main
removal mechanism of Cs+ was redox coupled alkali metal ion transport to form
Cs4Co4FeⅡ3(CN)18 species at the surface of PB-LDH.
However, IO3− was mainly removed by ion exchange with
intercalated Cl− in addition to the redox effect of Co
ions.
Keywords: Radioactive waste; Cesium; Iodate; Prussian blue; Layered double hydroxides |
|||||
