ABSTRACT Three novel diglycolamide monomers were synthesized and polymerized on silica. The diglycolamide polymer grafted silica were used as adsorbents for rare earth ions. The effects of acid concentration, structure of monomer, initial solution concentration, contact time and coexisting ions on adsorption of rare earth ions were investigated in detail. It was shown that the adsorption capacity increased with increasing acid concentration. Three adsorbents exhibited selectivity for middle and heavy rare earth over light rare earth in different extent. The adsorbent prepared from the monomer having the largest alkyl substituent showed the lowest adsorption capacity but the highest selectivity for different rare earth elements (REEs). Adsorption data were well fitted to the Langmuir isotherm and pseudo-second-order models. The presence of high concentrations (100 fold) of coexisting metal ions, K(I), Cr(II), Cu(II) or Fe(III), does not decrease the adsorption for rare earth ions seriously.

中文翻译：

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二甘醇酰胺聚合物改性二氧化硅的制备及其作为稀土离子吸附剂的应用

摘要 合成了三种新型二甘醇酰胺单体并在二氧化硅上聚合。二甘醇酰胺聚合物接枝二氧化硅用作稀土离子的吸附剂。详细研究了酸浓度、单体结构、初始溶液浓度、接触时间和共存离子对稀土离子吸附的影响。结果表明，吸附能力随着酸浓度的增加而增加。三种吸附剂对中重稀土的选择性高于轻稀土。由具有最大烷基取代基的单体制备的吸附剂对不同的稀土元素（REE）表现出最低的吸附容量但最高的选择性。吸附数据非常适合 Langmuir 等温线和伪二阶模型。