氮杂多环芳烃/离子液体萃取体系的伽马辐射效应

乏燃料后处理分离体系的辐射稳定性是其实际应用前需解决的重要问题。采用傅里叶变换红外光谱(FTIR)、超高效液相色谱/四级杆飞行时间质谱联用(UPLC/Q-TOF-MS)等方法系统研究了IB-BTP/[C₂mim][NTf₂]、CA-BTP/[C₂mim][NTf₂]和CA-BTPhen/[C₂mim][NTf₂]三种典型的氮杂多环芳烃/离子液体萃取分离体系的γ辐射效应,并通过Eu³⁺萃取实验对辐照前后体系的萃取性能变化进行了对比。结果表明:三种萃取剂在[C₂mim][NTf₂]离子液体中的辐射稳定性顺序为:CA-BTP>IB-BTP≈CA-BTPhen;三种体系的辐解产物主要为[C₂mim][NTf₂]离子液体辐解产生的·CF₃、·[C₂mim]⁺、·H等自由基进攻氮杂多环芳烃...

Gamma Radiation Effect on Heterocyclic N-Donor Ligands in Ionic Liquids

The radiation stability of separation systems for spent nuclear fuel reprocessing is an important problem to be solved before their practical use. In this work, the γ radiation effects on three commonly used heterocyclic N-donor ligands in ionic liquids(IB-BTP/［C₂mim］［NTf₂］, CA-BTP/［C₂mim］［NTf₂］ and CA-BTPhen/［C₂mim］［NTf₂］) were systematically studied by using Fourier transform infrared spectroscopy(FTIR) and ultra-high performance liquid chromatography/quadrupole time-of-flight mass spectrometry(UPLC/Q-TOF-MS). The changes in extraction performance of Eu³⁺ before and after irradiation were also compared. The results show that in the presence of ［C₂mim］［NTf₂］ ionic liquid, the order of the radiation stability of the three extracting agents is CA-BTP>IB-BTP≈CA-BTPhen; the main radiolysis products of the three systems are substitution products formed by heterocyclic N-donor ligands and radicals from ［C₂mim］［NTf₂］ ionic liquids(·CF₃, ·［C₂mim］⁺, ·H, etc.). Even at an absorbed dose of up to 300 kGy, good extraction performances are still maintained.