Funtionalized Sol-Gels for Selective Copper(II) Separation

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• 作者：Hee-Jung Im ; Yihui Yang ; Leonardo R. Allain ; Craig E. Barnes ; Sheng Dai ; and Ziling Xue
• 刊名：Environmental Science & Technology
• 出版年：2000
• 出版时间：June 1, 2000
• 年：2000
• 卷：34
• 期：11
• 页码：2209 - 2214
• 全文大小：229K
• 年卷期：v.34,no.11(June 1, 2000)
• ISSN：1520-5851

文摘

Inorganic-organic hybrid SiO₂ sol-gels anchored withamino (NH₂-CH₂CH₂-NH-, TMSen, and -NH-CH₂CH₂-NH-, Bis-TMSen) and mercapto (HS-) ligands have beenstudied as new sorbents for Cu²⁺ separation. The TMSen-anchored gels were found to be selective for Cu²⁺removal in the presence of Cd²⁺ and Zn²⁺. In comparison,mercapto-anchored gels remove both Cu²⁺ and Cd²⁺from a mixture of Cu²⁺, Cd²⁺, and Zn²⁺. These ligand-anchored materials, which were easily prepared from off-the-shelf chemicals in ca. 1 h, were hydrophilic andthus may give potentially fast kinetics of metal uploadand removal (from the gels) in aqueous solutions. The ligand-anchored sol gels loaded with Cu²⁺ ions were regeneratedwith acid, and the materials could then be used insubsequent metal removal cycles. The effect of the reactionconditions [catalysts, ligand/Si(OMe)₄ ratios, and curingtemperatures] on sol-gel properties and performance wereinvestigated. In addition, the kinetics of Cu²⁺ upload andremoval by these ligand-anchored sol-gel materials werestudied. The work here shows that these hydrophilic ligand-anchored sol-gels are a good alternative to ligand-anchoredorganic polymers for toxic metal separation.