【作者】 敖银勇； 周瀚洋； 彭静； 李久强； 翟茂林；

【Author】 AO Yin-yong;ZHOU Han-yang;PENG Jing;LI Jiu-qiang;ZHAI Mao-lin;Beijing National Laboratory for Molecular Sciences,Radiochemistry and Radiation Chemistry Key Laboratory for Fundamental Science,College of Chemistry and Molecular Engineering,Peking University;

【机构】 北京大学化学与分子工程学院放射化学与辐射化学重点学科实验室北京分子科学国家实验室；

【摘要】 离子液体作为新一代"绿色溶剂",具有低挥发性、高热稳定性和化学稳定性,在萃取金属离子等方面具有独特优势,被认为可望替代传统易挥发有机溶剂用于水法后处理乏燃料,因而在乏燃料后处理中具有广阔潜在应用前景。由于乏燃料后处理涉及强辐射环境,离子液体辐射稳定性评估是其实际应用的前提和关键。因此,我们对最有应用前景的1-丁基-3-甲基咪唑型离子液体（[C₄ mim][NTf₂]&[C₄ mim][PF₆]）及其萃取体系γ辐射稳定性进行了系统研究。通过重水洗涤的方法,首次确定咪唑型离子液体主要水溶性辐解产物种类,并进行定量研究。同时,对冠醚/离子液体萃取体系的辐射效应进行了研究,指认萃取体系的主要辐解产物及辐解机理,研究辐解产物对萃取金属离子的影响,发现冠醚/咪唑离子液体萃取体系的辐射稳定性明显优于传统溶剂体系。此外,采用He⁺束辐照来模拟研究离子液体α辐射效应,结果表明He⁺束辐照与γ辐照的辐解产物相似。以上研究成果表明离子液体及其萃取体系具有良好的辐射稳定性,可望用于乏燃料后处理中分离放射性核素。更多还原

【Abstract】 The room-temperature ionic liquids(RTILs) as novel solvents have many attractive physical and chemical properties,such as negligible vapor pressure even at elevated temperatures,good conductivity,and excellent thermal and chemical stability.RTILs are considered as promising solvents instead of traditional organic solvents for liquid-liquid extraction of radioactive isotopes in the reprocessing of spent nuclear fuel(SNF).During the practical application of liquid-liquid extraction,RTILs must be exposed to very complicated environment,such as salinity,acidity,temperature,and radiation field,etc.Therefore,studies on the radiation effect of RTILs and their extraction for metal ions are of great importance in the assessment of application feasibility in the reprocessing of SNF.Herein,we summarize our recent works on the identification of radiolytic products of RTILs-based extraction system and their effect on the removal of metal ions.The feasibility of RTILs as alternative media for separations of highly radioactive nuclides from spent nuclear fuel was assessed from the radiation chemistry aspect.These results indicate that RTILs and their extraction system have high radiation stability,suggesting their potential application in spent nuclear fuel reprocessing.更多还原