Efficient removal of iodide anion from aqueous solution with recyclable core-shell magnetic Fe3O4 @Mg/Al layered double hydroxide (LDH)Efficient removal of iodide anion from aqueous solution with recyclable core-shell magnetic Fe3O4@Mg/Al layered double hydroxide (LDH)
- Other Titles
- Efficient removal of iodide anion from aqueous solution with recyclable core-shell magnetic Fe3O4@Mg/Al layered double hydroxide (LDH)
- Authors
- Jung, Il-Kwon; Jo, Yongheum; Han, Sol-Chan; Yun, Jong-Il
- Issue Date
- Feb-2020
- Publisher
- ELSEVIER
- Keywords
- Iodide removal; Adsorption; Magnetic layered double hydroxide (LDH); Mg/Al ratio; Recyclable adsorbent; Magnetic composite
- Citation
- Science of the Total Environment, v.705, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- Science of the Total Environment
- Volume
- 705
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/186260
- DOI
- 10.1016/j.scitotenv.2019.135814
- ISSN
- 0048-9697
- Abstract
- 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.
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