Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 705, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.135814
Keywords
Iodide removal; Adsorption; Magnetic layered double hydroxide (LDH); Mg/Al ratio; Recyclable adsorbent; Magnetic composite
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Funding
- National Research Foundation of Korea (NRF) - Korea government [NRF-2017M2A8A4056643]
- Nuclear R&D Program of the National Research Foundation of Korea - Korean Ministry of Science and ICT [2016M2B2B1945252]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2016R1A5A1013919]
- National Research Foundation of Korea [2016M2B2B1945252, 2017M2A8A4056643] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Magnetic Mg/Al layered double hydroxides (LDH) with three cationic ratios (Mg/Al 2:1, 3:1, and 4:1) were successfully synthesized and utilized for the first time in an iodide adsorption study. The effects of the Mg/Al ratio of LDH on iodide adsorption were investigated, and physicochemical properties of synthetic LDHs depending on Mg/Al ratio were confirmed by XRD, TEM, ICP-OES, VSM, Zeta-potential, and BET analyses. The ferrimagnetic property was well preserved even after a coating of LDH on magnetite irrespective of the Mg/Al ratio. Among the three Mg/Al ratios, the calcined Fe3O4@4:1 Mg/Al LDH exhibited excellent performance for iodide removal with 105.04 mg/g of the maximum iodide adsorption capacity due to its wide interlayer spacing and largest BET surface area. In the presence of competing carbonate anions, the Fe3O4 @4:1 LDH showed removal rate of >80% at a dosage of over 3 g/L solid to liquid ratio. The recyclability test of Fe3O4@4:1 LDH showed that the removal performance for iodide is maintained at >80% even during the first to the fourth cycles. These results demonstrated that the magnetic Mg/Al LDH adsorbent can be effectively utilized for remediation of radioactive iodide anions with high efficiency and economics. (C) 2018 Elsevier B.V. All rights reserved.
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