离子印迹聚合物的合成及其在碳酸铀酰铵溶液中的吸附性能

以铀酰离子(UO₂²⁺)为模板, 与功能单体甲基丙烯酸-(1,3-二苯基-1,3-二羰基)-2-丙酯(DBM-MAA)、交联剂乙二醇二甲基丙烯酸酯(EGDMA)和引发剂偶氮二异丁腈(AIBN)在致孔剂1,4-二氧六环中进行聚合后, 用50 mmol/L的HCl溶液洗脱模板UO₂²⁺, 制得可用于特异性吸附UO₂²⁺的离子印迹聚合物(IIP)。当UO₂²⁺与DBM-MAA为1:3时合成的IIP吸附效果最好。此IIP能从碳酸铀酰铵溶液中竞争吸附UO₂²⁺, 最大吸附容量为9.4 mg U/g。此IIP能从含有Li⁺, Na⁺, K⁺和Rb⁺等金属离子的溶液中选择性吸附UO₂²⁺。

Synthesis of a New Ionic Imprinted Polymer for the Adsorption of Uranium from (NH4)4[UO2(CO3)3] Solution

The ionic imprinted polymer (IIP) of uranyl ion (UO₂²⁺) was synthesized by the formation of binary complexes of UO₂²⁺ with 1,3-dioxo-1,3-diphenylpropan-2-yl methacrylate (DBM-MAA) as functional monomer followed by thermal copolymerization with ethylene glycol dimethacrylate (EGDMA) as cross-linking monomer in the presence of 2,2′-azobisisobutyronitrile (AIBN) as initiator and 1,4-dioxane as porogenic solvent. 50 mmol/L HCl solution was used to leach out UO₂²⁺ ions from the polymer. The IIP formed with 1:3 molar ratio of UO₂²⁺ to DBM-MAA showed better enrichment of uranyl ion from dilute aqueous solution than others and hence was chosen for detailed studies. The maximum adsorption capaci(NH₄)₄UO₂(CO₃)₃]sub>)₃] solution was 9.4 mg U/g. The prepared IIP could selectively separate UO₂²⁺ from other metal ions, such as Li⁺, Na⁺, K⁺ and Rb⁺.