title: Investigation of the strontium (Sr(II)) adsorption of an alginate microsphere as a low-cost adsorbent for removal and recovery from seawater.
abstract: In this paper, we investigated alginate microspheres as a low-cost adsorbent for strontium (Sr(II)) removal and recovery from seawater. Alginate microspheres have demonstrated a superior adsorption capacity for Sr(II) ions (≈110 mg/g). A Freundlich isotherm model fits well with the Sr(II) adsorption of an alginate microsphere. The mechanism of Sr(II) adsorption is inferred as an ion exchange reaction with Ca(II) ions. The effects of the solution pH and co-existing ions in seawater are also investigated. Except for a pH of 1-2, Sr(II) adsorption capacity is not affected by pH. However, increasing the seawater concentration of metal cations seriously decreases Sr(II) uptake. In particular, highly concentrated (15,000 mg/L) Na(I) ions significantly interfere with Sr(II) adsorption. Sr(II) desorption was performed using 0.1 M HCl and CaCl2. Both regenerants show an excellent desorption efficiency, but the FTIR spectrum reveals that the chemical structure of the microsphere is destroyed after repeated use of HCl. Conversely, CaCl2 successfully desorbed Sr(II) without damage, and the Sr(II) adsorption capacity does not decrease after three repeated uses. The alginate microsphere was also applied to the adsorption of Sr(II) in a real seawater medium. Because of inhibition by co-existing ions, the Sr(II) adsorption capacity was decreased and the adsorption rate was retarded compared with D.I. water. Although the Sr(II) adsorption capacity was decreased, the alginate microsphere still exhibited 17.8 mg/g of Sr(II) uptake in the seawater medium. Considering its excellent Sr(II) uptake in seawater and its reusability, an alginate microsphere is an appropriate cost-effective adsorbent for the removal and recovery of Sr(II) from seawater.
authors.affiliation: Korea Institute of Geoscience and Mineral Resources, Gwahang-no 92, Yuseong-gu, Daejeon, 305-350, Republic of Korea.
authors.forename: Hye-Jin
authors.initials: HJ
authors.lastname: Hong
authors.affiliation: Korea Institute of Geoscience and Mineral Resources, Gwahang-no 92, Yuseong-gu, Daejeon, 305-350, Republic of Korea.
authors.forename: Jungho
authors.initials: J
authors.lastname: Ryu
authors.affiliation: Korea Institute of Geoscience and Mineral Resources, Gwahang-no 92, Yuseong-gu, Daejeon, 305-350, Republic of Korea.
authors.forename: In-Su
authors.initials: IS
authors.lastname: Park
authors.affiliation: Korea Institute of Geoscience and Mineral Resources, Gwahang-no 92, Yuseong-gu, Daejeon, 305-350, Republic of Korea.
authors.forename: Taegong
authors.initials: T
authors.lastname: Ryu
authors.affiliation: Korea Institute of Geoscience and Mineral Resources, Gwahang-no 92, Yuseong-gu, Daejeon, 305-350, Republic of Korea.
authors.forename: Kang-Sup
authors.initials: KS
authors.lastname: Chung
authors.affiliation: Korea Institute of Geoscience and Mineral Resources, Gwahang-no 92, Yuseong-gu, Daejeon, 305-350, Republic of Korea. Electronic address: kgbkim@kigam.re.kr.
authors.forename: Byuong-Gyu
authors.initials: BG
authors.lastname: Kim
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D008863:Microspheres; D008962:Models, Theoretical; D012623:Seawater / Q000737:chemistry*; D013324:Strontium / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D000464:Alginates; D006603:Hexuronic Acids; D014874:Water Pollutants, Chemical; D020723:Glucuronic Acid; D013324:Strontium
keywords: Adsorption; Alginate microsphere; Desorption; Seawater; Strontium