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dc.contributor.author Ryu, Jungho -
dc.contributor.author Kim, Soonhyun -
dc.contributor.author Hong, Hye-Jin -
dc.contributor.author Hong, Jeongsik -
dc.contributor.author Kim, Minsun -
dc.contributor.author Ryu, Taegong -
dc.contributor.author Park, In-Su -
dc.contributor.author Chung, Kang-Sup -
dc.contributor.author Jang, Jum Suk -
dc.contributor.author Kim, Byoung-Gyu -
dc.date.available 2017-07-04T00:48:19Z -
dc.date.created 2017-04-10 -
dc.date.issued 2016-11-15 -
dc.identifier.issn 1385-8947 -
dc.identifier.uri http://hdl.handle.net/20.500.11750/2128 -
dc.description.abstract Strontium ion (Sr2+) separation from seawater has attracted attention for radioactive pollutants removal and for Sr2+ recovery. Herein, we synthesized titanate nanotubes (TiNTs) via a simple hydrothermal reaction, characterized their physicochemical properties, and systematically evaluated Sr2+ sorption behavior under various reaction conditions corresponding to seawater environments. The synthesized TiNTs exhibited a fibril-type nanotube structure with a high specific surface area (260m2/g). Sr2+ adsorption on TiNTs rapidly occurred following a pseudo-second-order kinetic model and was in good agreement with the Langmuir isotherm model, indicating a maximum adsorption capacity of 97mg/g. Based on the Sr2+ uptake and Na+ release with a stoichiometric balance, the Sr2+ sorption mechanism on TiNTs was ion exchange between Na+ in the TiNT lattice and Sr2+ in the solution phase, as confirmed by XRD and Raman analysis. Among the competitive ions, Ca2+ significantly hindered Sr2+ sorption on TiNTs, whereas Na+ only slightly affected Sr2+ sorption, despite the Na+ exchange sorption mechanism. The effect of Ca2+ on Sr2+ sorption was evaluated by introducing a distribution coefficient (Kd) as a critical factor in determining the selectivity, which revealed a slightly higher selectivity for Sr2+. The Sr2+ adsorption-desorption test in a real seawater medium enabled the determination of Kd and the concentration factor (CF) for co-existing matrix ions in seawater; these values were evaluated for Sr2+ removal and recovery from seawater. TiNTs were regenerated by acid treatment and reused through consecutive adsorption-desorption experiments. While most studies addressing Sr2+ sorption using TiNTs aimed for extraction from wastewater and radioactive wastewater, this study elucidated Sr2+ sorption behavior under seawater conditions and provided insights into developing the removal and recovery processes from seawater. © 2016 -
dc.publisher Elsevier -
dc.title Strontium ion (Sr2+) separation from seawater by hydrothermally structured titanate nanotubes: Removal vs. recovery -
dc.type Article -
dc.identifier.doi 10.1016/j.cej.2016.06.131 -
dc.identifier.scopusid 2-s2.0-84977110972 -
dc.identifier.bibliographicCitation Chemical Engineering Journal, v.304, pp.503 - 510 -
dc.subject.keywordAuthor Strontium -
dc.subject.keywordAuthor Seawater -
dc.subject.keywordAuthor Titanate nanotubes -
dc.subject.keywordAuthor Recovery -
dc.subject.keywordAuthor Separation -
dc.subject.keywordPlus ADSORBENTS -
dc.subject.keywordPlus Adsorption -
dc.subject.keywordPlus COMPOSITE -
dc.subject.keywordPlus DESORPTION -
dc.subject.keywordPlus Distribution Coefficient -
dc.subject.keywordPlus EFFICIENT -
dc.subject.keywordPlus EXCHANGE -
dc.subject.keywordPlus EXTRACTION -
dc.subject.keywordPlus FUKUSHIMA -
dc.subject.keywordPlus HEAVY-METAL IONS -
dc.subject.keywordPlus High Specific Surface Area -
dc.subject.keywordPlus Ion Exchange -
dc.subject.keywordPlus Ions -
dc.subject.keywordPlus Isotherms -
dc.subject.keywordPlus Langmuir Isotherm Models -
dc.subject.keywordPlus Mesoporous Materials -
dc.subject.keywordPlus NANOTUBES -
dc.subject.keywordPlus Physicochemical Property -
dc.subject.keywordPlus Pseudo-Second-Order Kinetic Models -
dc.subject.keywordPlus Radioactive Pollutants -
dc.subject.keywordPlus RADIOACTIVE STRONTIUM -
dc.subject.keywordPlus Radioactivity -
dc.subject.keywordPlus RECOVERY -
dc.subject.keywordPlus Removal and Recoveries -
dc.subject.keywordPlus Seawater -
dc.subject.keywordPlus Separation -
dc.subject.keywordPlus Sorption -
dc.subject.keywordPlus Strontium -
dc.subject.keywordPlus Strontium Titanates -
dc.subject.keywordPlus Titanate Nanotubes -
dc.subject.keywordPlus Titanium Compounds -
dc.subject.keywordPlus WATER -
dc.subject.keywordPlus Yarn -
dc.citation.endPage 510 -
dc.citation.startPage 503 -
dc.citation.title Chemical Engineering Journal -
dc.citation.volume 304 -
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