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Electrochemical Recovery of Cobalt Ions From Aqueous Solution by Using Copper Hexacyanoferrate Electrode

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한국방사성폐기물학회 학술논문요약집 (Abstracts of Proceedings of the Korean Radioactive Wasts Society)
한국방사성폐기물학회 (Korean Radioactive Waste Society)
초록

Heavy metal wastewater containing cobalt (Co2+) has received more attention as an environment issue, which is released from electroplating processes, battery materials industries, nuclear power plants, etc. Especially, cobalt exposed to high-temperature and high-pressure environment during the operation of a nuclear power plant to form corrosion products and forming a chalk river unidentified deposit (CURD) along with radioactive materials generated in cooling water pipes. Cobalt present in the oxide film is mainly Co-60, which emits radiation and causes increased radiation exposure to workers, and efficient management is essential. In this study, we demonstrated the performance of copper hexacyanoferrate (CuHCF) electrodes in a capacitive deionization (CDI) system for Co2+ ions removal. The structure and chemical status of CuHCF used as an electrode material were characterized, and electrochemical properties were evaluated. This study showed that Co2+ ions could be efficiently removed in aqueous solutions using CuHCF electrodes. It has been experimentally shown that the ion removal mechanism is driven by the insertion of Co2+ ions within the CuHCF lattice channels. The deionization capacities in 20 and 50 mg-Co2+ L-1 aqueous solutions were 141.62 and 156.85 mg g-1, respectively, and the corresponding charge efficiencies (Λ) were 0.55 and 0.68, respectively. Thus, we suggest that an electrochemically driven process using CuHCF can usefully remove Co2+ ions from wastewater.

저자
  • Sang-Hun Lee(Korea Atomic Energy Research Institute (KAERI))
  • Mansoo Choi(Korea Atomic Energy Research Institute (KAERI))
  • Byung-Seon Choi(Korea Atomic Energy Research Institute (KAERI))
  • Wang-Kyu Choi(Korea Atomic Energy Research Institute (KAERI))
  • Jong-Yun Kim(Korea Atomic Energy Research Institute (KAERI))
  • Sang-Ho Lim(Korea Atomic Energy Research Institute (KAERI)) Corresponding author