Crown Ether-Doped Sol-Gel Materials for Strontium(II) Separation

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• 作者：Terry L. Yost ; Jr. ; Bryan C. Fagan ; Leonardo R. Allain ; Craig E. Barnes ; Sheng Dai ; Michael J. Sepaniak ; and Ziling Xue
• 刊名：Analytical Chemistry
• 出版年：2000
• 出版时间：November 1, 2000
• 年：2000
• 卷：72
• 期：21
• 页码：5516 - 5519
• 全文大小：180K
• 年卷期：v.72,no.21(November 1, 2000)
• ISSN：1520-6882

文摘

Hybrid organic/inorganic sol-gel materials containing anencapsulated crown ether ligand were found to selectivelyremove 91.4 ± 1.3% of Sr²⁺ from a solution containingexcess of competing ions such as Ca²⁺. The crown etherligand, 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane-7,16-bis(malonate) ligand (Na₄oddm), with known highaffinity for Sr²⁺ was encapsulated in hydrophilic SiO₂through a simple sol-gel process. Washing the Sr²⁺-loaded gel with acid or ethylenediaminetetraacetic aciddisodium salt recovered the Sr²⁺ from the sol-gel sorbentand regenerated the doped gel for subsequent Sr²⁺ intake.The approach reported here is a new alternative to theuse of crown ethers in metal ion separation through, forexample, solvent extraction or the use of sorbents containing chemically grafted crown ether ligands.