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Sequential removal of radioactive Cs by electrochemical adsorption and desorption reaction using core-shell structured carbon nanofiber–Prussian blue composites

Title
Sequential removal of radioactive Cs by electrochemical adsorption and desorption reaction using core-shell structured carbon nanofiber–Prussian blue composites
Authors
Park, Jeong-HyunKim, HyuncheolKim, MinsunLim, Jong-MyoungRyu, JunghoKim, Soonhyun
DGIST Authors
Kim, Minsun; Kim, Soonhyun
Issue Date
2020-11
Citation
Chemical Engineering Journal, 399, 125817
Type
Article
Article Type
Article
Author Keywords
ElectrochemicalRadioactive cesium removalCore-shell structuredPrussian blueCarbon nanofiber
Keywords
BLUE/GRAPHENE OXIDE NANOCOMPOSITESCESIUM REMOVALWASTE-WATERIONSPOLYACRYLONITRILE
ISSN
1385-8947
Abstract
137Cs is harmful to human health and the environment; hence, research on new techniques and development of materials for removing from contaminated water have attracted attention. Herein, we demonstrate that core-shell structured Prussian blue–carbon nanofiber (PB–CNF) composites, synthesized by electrodeposition, can be used to effectively remove radioactive 137Cs via electrochemical adsorption/desorption. PB nanoparticles with thicknesses of tens of nanometers were electrochemically formed on the CNF core with a diameter of approximately 100 nm; the exact weight of PB on CNF was 2.75 mg/cm2. The PB–CNF electrodes more efficiently adsorbed and desorbed the Cs ions than the existing PB–FTO electrode and PB–commercial carbon cloth. Transmission electron microscopy and energy-dispersive X-ray spectroscopy analyses confirmed that the Cs ions removed from the solution were adsorbed on PB rather than on CNF. X-ray photoelectron spectroscopy analysis confirmed that the oxidation state of iron in PB changes depending on the Cs ion adsorption and desorption reaction. Cycling experiments of electrochemical adsorption and desorption using PB–CNF showed that radioactive 137Cs and non-radioactive Cs ions can be continuously removed from radioactive wastewater and accumulated in a specific solution. These results imply that the PB–CNF composite can efficiently remove radioactive Cs and significantly reduce secondary radioactive waste. Moreover, the composite is reusable and can aid the establishment of a low-cost alternative Cs removal process. © 2020 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/12775
DOI
10.1016/j.cej.2020.125817
Publisher
Elsevier BV
Related Researcher
Files:
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Collection:
Division of Energy Technology1. Journal Articles


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