聚丙烯酰胺-咪唑类聚离子液体凝胶的辐射合成及其对铀和碘的吸附

Radiation Syntheses of Poly(Acrylamide)/Poly(Ionic Liquid) Gels for Adsorption of Uranyl and Iodide Ion

采用γ射线辐射引发技术制备了一类聚丙烯酰胺-咪唑类聚离子液体凝胶(PAm-C_nvim_2Br_2)。当吸收剂量为5kGy时,得到了凝胶分数超过95%的聚离子液体凝胶,其溶胀度可由吸收剂量控制。合成的PAmC_nvim_2Br_2可以从碳酸盐溶液中吸附铀最大吸附量约130mg/g,或从碘化钠溶液中吸附碘离子最大吸附量约160mg/g,吸附过程符合Langmuir模型。红外与XPS分析表明,吸附过程遵循离子交换的反应机理。PAmC_nvim_2Br_2凝胶对铀及碘有很好的吸附、解吸性能,有望用于含有铀和碘的放射性废水处理。

In order to remove uranyl and iodide ions from aqueous radioactive waste, poly （acrylamide）/poly（ionic liquid） hydrogels （PAm-Cnvim2Br2 ） were prepared by y radiation induced polymerization and crosslinking. A high gel fraction value of about 95 can be achieved under 5 kGy, and the equilibrium degree of swelling can be adjusted by absorbed dose. The resultant PAm-Cnvim2Br2 can strongly adsorb uranyl ion with an adsorption capacity as high as about 130 mg/g （U/gel） from carbonate solutions, or iodide ion with an adsorption capacity as high as about 160 mg/g （I/gel） from sodium iodide solution, follow ing a Langmuir model. IR and XPS analyses indicate that it is an ion exchange mechanism. PAm-Cnvim2Br2 hydrogels have excellent adsorption and desorption performances for uranyland iodide ion, and it is expected to be used in the disposal of aqueous radioactive waste.