从酸性高水平放射性液体废物中提取离子 (Cs+) 的染色学 (EC) 技术演示
Jayaprakasam Selvakumar1,2, Subramanian Srinivasan1, Gattu Suneel1
1Nuclear Recycle Board, Bhabha Atomic Research Centre, Kalpakkam 603102, Tamil Nadu, India.
ACS omega
|March 17, 2025
概括
这项研究开发了一种可重复使用的树脂 (CC6-IDA/X7),用于从高水平放射性废物中选择性回收-137. 树脂具有较高的吸附率和回收率,通过低温热解来有效管理.
科学领域:
- 放射化学 放射化学是指辐射化学.
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
背景情况:
- 高水平放射性液体废物 (HLW) 带来了重大处置挑战.
- -137 (Cs+) 是一种主要的放射性成分,需要有效的分离和回收.
- 现有的从HLW中去除Cs+的方法往往在选择性和可重复使用性方面面临限制.
研究的目的:
- 开发和评估用于选择性Cs+从HLW分离的新型树脂.
- 评估开发的树脂的吸附能力,选择性,回收效率和可重复使用性.
- 为了研究使用低温热解的废树脂的管理.
主要方法:
- 1,3-dioctyloxy-calix[4]arene-18-crown-6-impregnated XAD-7 (CC6/X7) 和异乙醇 (IDA) 修饰 (CC6-IDA/X7) 树脂的合成和表征.
- 吸附和回收实验使用模拟的HLW溶液与不同度的酸.
- 在多个吸附-脱附周期中评估树脂的可重复使用性.
- 使用热电离质谱法分析Cs+同位素组成.
- 使用同时热分析 (STA) 和动力分析 (弗里德曼和Vyazovkin方法) 的热解研究.
主要成果:
- CC6/X7和CC6-IDA/X7树脂均表现出显著的Cs+吸附能力 (分别为56%和55%) 从4.0mol·L−1 HNO3.
- 与CC6/X7 (15%) 相比,CC6-IDA/X7在0.01mol·L-1 HNO3中显示出更高的Cs+可回收性 (38%).
- CC6-IDA/X7在5个吸附-脱吸周期中保持了超过99%的回收效率.
- 热解研究证实,Cs+ 仍然存在于CC6-IDA/X7的焦炭残留物中,这表明Cs+ 在废气中没有损失.
结论:
- CC6-IDA/X7树脂是一种高度选择性和可重复使用的提取剂,用于从HLW中回收Cs+.
- 低温热解提供了有效的消耗树脂管理策略,防止Cs+释放.
- 使用CC6-IDA/X7的提取色谱为从HLW中进行工业规模的Cs+回收提供了一个有希望的方法.
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