Ning Shun Yan, Wang Xin Peng, Zou Qing, Shi Wei Qun, Tang Fang Dong, He Lin Feng, Wei Yue Zhou
School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China.
State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning, 530004, China.
Sci Rep. 2017 Oct 31;7(1):14679. doi: 10.1038/s41598-017-14758-2.
Directly separating minor actinides (MA: Am, Cm, etc.) from high level liquid waste (HLLW) containing lanthanides and other fission products is of great significance for the whole nuclear fuel cycle, especially in the aspects of reducing long-term radioactivity and simplifying the post-processing separation process. Herein, a novel silica-based adsorbent Me-CA-BTP/SiO-P was prepared by impregnating Me-CA-BTP (2,6-bis(5,6,7,8-tetrahydro-5,8,9,9-tetramethyl-5,8-methano-1,2,4-benzotriazin-3-yl)pyridine) into porous silica/polymer support particles (SiO-P) under reduced pressure. It was found Me-CA-BTP/SiO-P exhibited good adsorption selectivity towards Am(III) over Eu(III) in a wide nitric acid range, acceptable adsorption kinetic, adequate stability against γ irradiation in 1 and 3 M HNO solutions, and successfully separated Am(III) from simulated 3 M HNO HLLW. In sum, considering the good overall performance of Me-CA-BTP/SiO-P adsorbent, it has great application potential for directly separating MA from HLLW, and is expected to establish an advanced simplified MA separation process, which is very meaningful for the development of nuclear energy.
从含有镧系元素和其他裂变产物的高放废液（HLLW）中直接分离次锕系元素（MA：镅、锔等）对于整个核燃料循环具有重要意义，特别是在降低长期放射性和简化后处理分离工艺方面。在此，通过在减压下将Me-CA-BTP（2,6-双（5,6,7,8-四氢-5,8,9,9-四甲基-5,8-亚甲基-1,2,4-苯并三嗪-3-基）吡啶）浸渍到多孔二氧化硅/聚合物载体颗粒（SiO-P）中，制备了一种新型的二氧化硅基吸附剂Me-CA-BTP/SiO-P。研究发现，Me-CA-BTP/SiO-P在较宽的硝酸浓度范围内对Am(III)比对Eu(III)表现出良好的吸附选择性，具有可接受的吸附动力学，在1 M和3 M硝酸溶液中对γ辐射具有足够的稳定性，并成功地从模拟的3 M硝酸高放废液中分离出Am(III)。总之，考虑到Me-CA-BTP/SiO-P吸附剂的良好综合性能，它在从高放废液中直接分离次锕系元素方面具有很大的应用潜力，并有望建立一种先进的简化次锕系元素分离工艺，这对核能的发展非常有意义。
