通过碳化Fe3O4纳米粒子作为强大的吸附剂在酸性系统中介于f-块元素的分离
Dharmendra B Sharma1,2, Rutuja Gumathannavar3, Arijit Sengupta4,5
1Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India.
Scientific reports
|July 9, 2025
概括
酸功能化的磁纳米粒子有效吸收三价欧 (Eu3+) 和美洲 (Am3+) 离子. 这些纳米粒子为从溶液中去除放射性污染物提供了一个有希望的方法.
科学领域:
- 材料科学 材料科学 材料科学
- 放射化学 放射化学是指辐射化学.
- 环境科学 环境科学
背景情况:
- 三价兰化物和动化物离子,如欧 (Eu3+) 和美洲 (Am3+),由于其放射性,具有重大环境和健康风险.
- 从受污染的水源中去除这些放射性核素的有效方法对于环境修复至关重要.
研究的目的:
- 合成和表征酸功能化的磁纳米粒子 (CA-MNP).
- 研究CA-MNP对Eu3+和Am3+的吸附效率和动力学.
- 用不同的试剂评估装载放射性核素的剥离效率.
主要方法:
- 用酸功能化磁性纳米粒子的合成.
- 使用FTIR,SEM,TEM和泽塔电位测量的表征.
- 吸附实验以确定吸收效率,动力学 (伪二级) 和热力学 (ΔG).
- 使用EDTA,酸,Na2CO3和HNO3进行脱皮研究.
主要成果:
- 通过酸涂层成功合成和表征CA-MNP.
- 在2.5 mg mL-1 CA-MNP时,Eu3+ (76.7%) 和Am3+ (60.9%) 的有效吸附.
- 吸附遵循伪第二阶动力学,速度常数为4.76 × 10−9 mg g−1 min−1 (Am3+) 和2.45 × 10−7 mg g−1 min−1 (Eu+3).
- 自发吸附过程以负 ΔG 值表示 (-15.8 kJ mol-1 对于 Am3+,-17.9 kJ mol-1 对于 Eu3+).
- 0.1M EDTA显示出最好的剥离结果,在两个周期内剥离了>99%的Eu3+,而Am3+需要更多的周期.
结论:
- CA-MNP是三价兰化物和动化物离子的有效吸收剂.
- 吸附过程是自发的,并遵循伪二阶动力学.
- EDTA是Eu3+的有效剥离剂,这表明放射性核酸回收和废水处理的潜力.
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