Enhanced Sr adsorption performance of MnO2-alginate beads in seawater and evaluation of its mechanism
| Autor: | Byoung-Gyu Kim, Hye-Jin Hong, Hyunchul Kim, Jungho Ryu, Jeongsik Hong, Kang-Sup Chung, In-Su Park, Taegong Ryu |
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| Rok vydání: | 2017 |
| Předmět: |
Strontium
Chromatography Chemistry General Chemical Engineering Metal ions in aqueous solution chemistry.chemical_element 02 engineering and technology General Chemistry 010501 environmental sciences Alginate bead 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering Adsorption Environmental Chemistry Seawater 0210 nano-technology Selectivity 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Chemical Engineering Journal. 319:163-169 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2017.02.132 |
| Popis: | Alginate bead is a promising adsorbent for Sr ions in solution, but their adsorption performance is limited in seawater due to the competition with other concentrated ions. In this study, MnO 2 -alginate beads were prepared by immobilizing MnO 2 in alginate, and their feasibility for Sr adsorption in seawater was evaluated. MnO 2 -alginate beads consisted of 16.1% MnO 2 and 7.0% alginate, while plain alginate beads contained only 3.7% alginate. That is, immobilizing MnO 2 in alginate induced a compact structure in the MnO 2 -alginate beads, which resulted in a lower amount of moisture. Sr adsorption on MnO 2 -alginate beads occurred predominantly on the alginate part and partially on the MnO 2 . Compared with plain alginate beads, MnO 2 -alginate beads exhibited significantly improved Sr adsorption efficiency in the presence of seawater with a concentration of Na (10,000 ppm), Mg (1200 ppm), Ca (400 ppm) and K (400 ppm) due to its enhanced Sr selectivity against Na and increased number of Sr adsorption sites. Finally, MnO 2 -alginate beads exhibited four times higher Sr adsorption efficiency than plain alginate beads in real seawater. These results demonstrate that MnO 2 -alginate beads are a highly feasible adsorbent for Sr removal from seawater. |
| Databáze: | OpenAIRE |
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