Metal-Ion Adsorption on Carboxyl-Bearing Self-Assembled Monolayers Covalently Bound to Magnetic Nanoparticles

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• 作者：Bin Hai ; Jun Wu ; Xufang Chen ; John D. Protasiewicz ; and Daniel A. Scherson
• 刊名：Langmuir
• 出版年：2005
• 出版时间：March 29, 2005
• 年：2005
• 卷：21
• 期：7
• 页码：3104 - 3105
• 全文大小：58K
• 年卷期：v.21,no.7(March 29, 2005)
• ISSN：1520-5827

文摘

Hematite nanoparticles have been functionalized with a self-assembled monolayer of undecanoic acid(UA) by covalent attachment via siloxane groups. The number density of carboxylic/carboxylate groupson the surface was determined by titration, yielding values on the order of 10¹⁴ UA molecules/cm² and thusconsistent with a closed-packed monolayer. The ability of these functionalized particles to adsorb Cd²⁺ inthe ppm range was demonstrated using in situ anodic stripping voltammetry.