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

Synthesis of a New Ionic Imprinted Polymer for the Adsorption of Uranium from(NH_4)_4[UO_2(CO_3)_3] Solution

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+。

The ionic imprinted polymer （liP） of uranyl ion （UO2^2＋） was synthesized by the formation of binary complexes of UO2^2＋ with 1,3-dioxo-l,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 HCI solution was used to leach out UO2^2＋ ions from the polymer. The IIP formed with 1：3 molar ratio of UO2^2＋ 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 capacities of liP in （NH4）4[UO2（CO3）3] solution was 9.4 mg U/g. The prepared IIP could selectively separate UO2^2＋ from other metal ions, such as Li^＋, Na^＋, K^＋ and Rb^＋.