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Strontium ion (Sr2+) separation from seawater by hydrothermally structured titanate nanotubes: Removal vs. recovery

Title
Strontium ion (Sr2+) separation from seawater by hydrothermally structured titanate nanotubes: Removal vs. recovery
Author(s)
Ryu, JunghoKim, SoonhyunHong, Hye-JinHong, JeongsikKim, MinsunRyu, TaegongPark, In-SuChung, Kang-SupJang, Jum SukKim, Byoung-Gyu
Issued Date
2016-11-15
Citation
Chemical Engineering Journal, v.304, pp.503 - 510
Type
Article
Author Keywords
StrontiumSeawaterTitanate nanotubesRecoverySeparation
Keywords
ADSORBENTSAdsorptionCOMPOSITEDESORPTIONDistribution CoefficientEFFICIENTEXCHANGEEXTRACTIONFUKUSHIMAHEAVY-METAL IONSHigh Specific Surface AreaIon ExchangeIonsIsothermsLangmuir Isotherm ModelsMesoporous MaterialsNANOTUBESPhysicochemical PropertyPseudo-Second-Order Kinetic ModelsRadioactive PollutantsRADIOACTIVE STRONTIUMRadioactivityRECOVERYRemoval and RecoveriesSeawaterSeparationSorptionStrontiumStrontium TitanatesTitanate NanotubesTitanium CompoundsWATERYarn
ISSN
1385-8947
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
URI
http://hdl.handle.net/20.500.11750/2128
DOI
10.1016/j.cej.2016.06.131
Publisher
Elsevier
Related Researcher
  • 김순현 Kim, Soonhyun
  • Research Interests Photocatalysis; 광촉매; Advanced Oxidation Processes; 고도산화; Radioactive Cesium Removal/Adsorption/Monitoring; 방사성 세슘 제거/흡착/모니터링
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Division of Energy & Environmental Technology 1. Journal Articles

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