通过改性Fe0纳米粒子:U(VI) 捕获动力学和长期稳定性评估来固定
Yilong Hua1, Xue Meng2, Guodong Zhao1
1School of Resource Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China; Key Discipline Laboratory in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, Hunan 421001, China.
Journal of hazardous materials
|April 4, 2025
概括
嵌入硫的纳米级零价值铁 (SnZVI) 在固定 (U(VI)) 的效率降低,并且与未经修改的nZVI相比,长期稳定性较低. 这项研究揭示了硫.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
背景情况:
- 纳米级零价值铁 (nZVI) 是有效的废水污染物去除.
- 硫修饰 (SnZVI) 增强了疏水性污染物去除,但其对疏水性乌兰离子 (U(VI)) 的影响还未得到充分研究.
- 由SnZVI封存的的长期稳定性需要调查.
研究的目的:
- 调查嵌入硫的纳米级零价值铁 (SnZVI) 在固定水友性乌兰离子 (U(VI)) 的有效性.
- 评估由SnZVI封存的的长期稳定性.
- 阐明硫修饰对nZVI在U(VI) 处理中的吸附性和氧化还原性能的影响.
主要方法:
- 通过一步和两步的方法,通过使用不同S/Fe摩尔比率 (0.1和0.3) 的二化物 (Na2S2O4) 合成SnZVI.
- 对U(VI) 固定和长期稳定的实验分析.
- 理论计算以了解表面相互作用和电子转移.
主要成果:
- SnZVI对U(VI) 离子的亲和力较低.
- 与nZVI相比,SnZVI中的电子转移障碍导致了较低的U(VI) 减少效率.
- 在210天内,SnZVI的脱离率较高,表明长期稳定性降低.
结论:
- 硫修饰对nZVI在U(VI) 固定化中的性能产生了负面影响.
- 由于吸附和氧化还原能力降低,SnZVI在处理污染废水方面效率低于nZVI.
- 这些发现为设计用于放射性废水处理的改进的SnZVI材料提供了洞察力.
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