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Photocatalytic enhancement of cesium removal by Prussian blue-deposited TiO2

Title
Photocatalytic enhancement of cesium removal by Prussian blue-deposited TiO2
Authors
Kim, HyuncheolKim, Min SunKim, WooyulLee, WannoKim, Soonhyun
DGIST Authors
Kim, Soonhyun
Issue Date
2018-09
Citation
Journal of Hazardous Materials, 357, 449-456
Type
Article
Article Type
Article
Keywords
Cesium removalPrussian blueTiO2Photocatalytic adsorptionUV lightRADIOACTIVE CESIUMSELECTIVE REMOVALPAINT LAYERSWATERIONSFUKUSHIMACS+DEGRADATIONMECHANISMSOXIDATION
ISSN
0304-3894
Abstract
After the Fukushima nuclear accident, tremendous efforts were made to treat radiocesium, radiostrontium, and other radioactive materials. For the first time, we demonstrate that a TiO2 photocatalyst can significantly enhance Cs adsorption by Prussian blue-deposited TiO2 (PB/TiO2) under UV irradiation. In this study, we synthesized PB/TiO2 using the photodeposition method. After the Cs ions were adsorbed on the PB/TiO2 in darkness, we then exposed the PB/TiO2 to UV light irradiation. This resulted in a further increase in Cs ion adsorption of more than 10 times the amount adsorbed in darkness. This photocatalytic-enhanced adsorption of Cs ions was not observed on PB mixed with SiO2, nor under visible light irradiation. We investigated the effects of PB concentration, PB/TiO2 concentration, and gas purging on both dark and photocatalytic-enhanced adsorption of Cs ions by PB/TiO2. Based on the results, we suggest that the photocatalytic-enhanced adsorption of Cs ions on PB/TiO2 is due to photocatalytic reduction of PB, which leads to additional adsorption of Cs ions. The change in solution color before and after the reaction, and the change in solution pH in the dark and during UV irradiation strongly support this suggestion. The photocatalytic-enhanced adsorption of Cs ions was equivalent during radioactive 137Cs removal, indicating important applications for pollutant removal from contaminated water. © 2018 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/6666
DOI
10.1016/j.jhazmat.2018.06.037
Publisher
Elsevier B.V.
Related Researcher
Files:
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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