Adsorption of lithium ions on novel nanocrystal MnO₂

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• 作者：Qin-Hui Zhang ; Shuying Sun ; Shaopeng Li ; Hao Jiang ; Jian-Guo Yu
• 关键词：Adsorption ; Ion exchange ; Lithium ; MnO₂ ; Nanostructure ; Separations
• 刊名：Chemical Engineering Science
• 出版年：2007
• 期刊代码：18_00092509
• 类别：ce
• 出版时间：September-October 2007
• 卷：62
• 期：18-20
• 页码：4869-4874
• 文件大小：331 K

摘要

Various polymorphs of MnO₂ were synthesized under a controlled hydrothermal method. The structure characteristics and ion exchangeability were studied by XRD, TEM, Li⁺ adsorption isotherm, kinetics and selectivity measurement. The MnO₂ nanowires, mainly about in diameter and length, are found to have a remarkable lithium ion-sieve property with equilibrium distribution coefficients (K_d) in the order of Na⁺<K⁺<Mg²⁺<Ca²⁺Li⁺, Li⁺ monolayer saturation amount of , and the first-order adsorption rate constant of , which is promising in the lithium extraction from brine or seawater.