通过耐辐射硫胺酸有效去除[UO2]2+,Cs+和Sr2+离子
Mei-Ling Feng1,2, Debajit Sarma2, Yu-Jie Gao1,3
1State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter , Chinese Academy of Sciences , Fuzhou , Fujian 350002 , People's Republic of China.
Journal of the American Chemical Society
|August 9, 2018
概括
两种新的硫酸,FJSM-GAS-1和FJSM-GAS-2,显示出优异的离子交换能力,可以去除,和离子. 这些材料因其高容量,快速交换和可回收性而有望用于核废弃物整治.
科学领域:
- 材料科学
- 环境化学
- 核工程
背景情况:
- 从复杂的水溶液中有效地去除 ([UO2]2+), (Cs+) 和 (Sr2+) 等放射性离子对于环境修复至关重要.
- 非传统的离子交换器为选择性捕获这些危险离子提供了潜在的解决方案.
研究的目的:
- 合成和描述具有优异离子交换性质的新型硫酸.
- 评估它们在去除[UO2]2+,Cs+和Sr2+离子中的有效性.
主要方法:
- 合成两种新的硫酸:[Me2NH2]2[Ga2Sb2S7]·H2O (FJSM-GAS-1) 和[Et2NH2]2[Ga2Sb2S7·H2O (FJSM-GAS-2).
- 对[UO2]2+,Cs+和Sr2+进行离子交换能力和动力学研究.
- 在各种条件下测量分布系数 (Kd),包括存在竞争性离子和pH范围.
主要成果:
- FJSM-GAS-1和FJSM-GAS-2对[UO2]2+ (196和144 mg/g),Cs+ (164 mg/g) 和Sr2+ (FJSM-GAS-1为80 mg/g) 的离子交换能力很高.
- 在[UO2]2+交换中观察到快速的平衡时间 (FJSM-GAS-1为5分钟,FJSM-GAS-2为15分钟).
- FJSM-GAS-1实现了的最高分布系数 (KdU = 6.06 × 106 mL/g),在Na+,Ca2+和HCO3-的存在下保持性能.
- 有效的[UO2]2+离子交换发生在广泛的pH范围 (2.9-10.5).
- 含的材料可以通过成本高效的化方法进行回收.
结论:
- FJSM-GAS-1和FJSM-GAS-2具有出色的离子交换特性,使它们在去除目标放射性离子方面非常有效.
- 它们的高选择性,快速动力学,可回收性,易于合成和耐辐射性使它们成为核废物管理中选择性分离的有希望的候选者.
- FJSM-GAS-1的卓越性能,特别是其创纪录的KdU值,突出了其用于先进环境修复策略的潜力.
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