对酸盐功能化离子液的评估,用于从酸料条件中分离Nb和Ta
Priya Goyal1, Arijit Sengupta1,2, Prasanta Kumar Mohapatra1,2
1Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
ACS omega
|October 9, 2023
概括
一种新的绿色离子液分离工艺有效分离 (Nb) 和 (Ta),分离因子高. 这种方法为重复利用提供了出色的可重复使用性和稳定性,用于重点金属回收.
科学领域:
- 材料科学 材料科学 材料科学
- 分离科学 分离科学
- 绿色化学 绿色化学
背景情况:
- (Nb) 和 (Ta) 的分离是具有挑战性的,因为它们具有相似的化学特性.
- 现有的分离方法通常涉及恶劣的条件,并产生危险废物.
- 离子液体 (ILs) 提供了开发更环保,更有效的分离工艺的潜力.
研究的目的:
- 开发一个单步"绿色"分离工艺,用于Nb和Ta的相互分离.
- 使用酸功能化离子液体 (FILs) 调查分离效率和机制.
- 评估开发系统的稳定性,可重复使用性和回收效率.
主要方法:
- 使用的胺酸功能化离子液 (FILs),特别是C8mim·NTf2和C4mim·NTf2,用于Nb和Ta的分离.
- 在酸溶液中进行液体液体提取实验.
- 分析了使用EDTA/DTPA-guanidine碳酸盐的分离因子,提取机制 (溶解与离子交换),放射性稳定性和反提取效率.
主要成果:
- 在2M酸下使用C8mim·NTf2获得了Nb/Ta的最大分离因子~48.
- 确定了不同的提取机制:C8mim·NTf2中的溶解和C4mim·NTf2.2中的离子交换.
- 经过四个循环后,提取效率降低了<8%,并且有望使用合剂进行回提取 (>99.99%脱落).
结论:
- 开发的基于FIL的绿色分离工艺显示了Nb/Ta相互分离的高效率和选择性.
- C8mim·NTf2通过溶解机制表现出优异的分离性能,而C4mim·NTf2则提供更好的放射性稳定性.
- 该过程是稳固的,可重复使用的,并且可以进行高效的回收提取,为可持续的Nb/Ta回收铺平了道路.
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